Physics 1 Final Exam
1J
A 10 kg block is sitting on the table. It's in the way, so you push it horizontally along the table for 1 m with a force of 1 N. How much work did you do on the block?
The speed of the 6-kg piece will be one half that of the 3-kg piece.
A 9-kg object is at rest. Suddenly, it explodes and breaks into two pieces. The mass of one piece is 6 kg and the other is a 3-kg piece. Which one of the following statements concerning these two pieces is correct?
no
A baby is bouncing in a seat fastened by an elastic cord to a hook on the ceiling. At the top of his bounce, his velocity is instantaneously zero. Is the vector sum of forces exerted on him at that instant zero?
exactly g.
A ball is thrown downward (not dropped) from the top of a tower. After being released, its downward acceleration will be
depends on the weight of the box.
A box is dropped from a height of 2.0 m. While the box is falling, the work done by gravity on the box
Both hit at the same time
A bullet is fired horizontally from a rifle. At the same time, a bullet that was resting next to the rifle falls. Which bullet hits the ground first?
the car's average acceleration points due west
A car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is now traveling due west at 20 m/s. What is the direction of the car's average acceleration over this period?
Yes, as long as the lengths of the swings are the same.
A child and an adult are on adjacent swings at the playground. Is the adult able to swing in synchrony with the child?
twice as long as
A constant force is exerted on a cart that is initially at rest on an air track. Friction between the cart and the track is negligible. The force acts for a short time interval and gives the cart a certain final speed. To reach the same final speed with a force that is only half as big, the force must be exerted on the cart for a time interval
The object will rotate with constant angular acceleration.
A constant net torque is applied to a rotating object. Which of the following best describes the object's motion?
smaller than
A feather and a brick are falling freely in an evacuated tube. The magnitude of the gravitational force exerted by Earth on the feather is _______________________ that exerted by Earth on the brick.
Her rotational inertia decreases
A figure skater stands on one spot on the ice (assumed frictionless) and spins around with her arms extended. When she pulls in her arms, her angular speed increases because:
2.0
A force F is exerted on a particle that undergoes a displacement D. a.Determine the work done by the force on the particle (in joules).
the speed of the freight car decrease
A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on the top. A large load of sand is suddenly dumped into the freight car. What happens to the speed of the freight car?
Both the girl and the boy have the same nonzero angular displacement.
A girl and a boy are riding on a merry-go-round that is turning at a constant rate. The girl is near the outer edge, and the boy is closer to the center. Who has greater angular displacement?
The girl has greater linear speed.
A girl and a boy are riding on a merry-go-round that is turning at a constant rate. The girl is near the outer edge, and the boy is closer to the center. Who has greater linear speed?
Both the girl and the boy have zero tangential acceleration
A girl and a boy are riding on a merry-go-round that is turning at a constant rate. The girl is near the outer edge, and the boy is closer to the center. Who has greater tangential acceleration?
the angular speed of the system increases and the moment of the inertia of the system decreases
A girl moves quickly to the center of a spinning merry-go-round, traveling along the radius of the merry-go-round. Which of the following statements are true?
less momentum and less kinetic energy.
A golf ball is fired at a bowling ball initially at rest and bounces back elastically. Compared to the bowling ball, the golf ball after the collision has
less momentum and less kinetic energy.
A golf ball is fired at a bowling ball initially at rest and bounces back elastically. Compared to the bowling ball, the golf ball after the collision has (momentum and KE)
less momentum and less kinetic energy
A golf ball is fired at a bowling ball initially at rest and sticks to it. Compared to the bowling ball, the golf ball after the collision has (momentum and KE)
less momentum and less kinetic energy.
A golf ball is fired at a bowling ball initially at rest and sticks to it. Compared to the bowling ball, the golf ball after the collision has (momentum and KE)
the work done is equal to the area under the curve
A graph depicts force versus position. What represents the work done by the force over the given displacement?
The side the heavy child is sitting on will tilt downward.
A heavy child and a lightweight child are balanced on a massless seesaw. The heavy child moves backward, increasing their distance from the pivot point. What happens to the seesaw?
the inertia does not change
A jeweler pounds a small ingot of gold into a thin sheet. What happens to the inertia of the gold?
The magnitude of the force on the truck is equal to the magnitude of the force on the car.
A large truck collides head-on with a small car. The car is severely damaged as a result of the collision. According to Newton's third law, how do the forces acting between the truck and car compare during the collision?
The ball experiences the greater momentum change.
A lump of putty and a rubber ball have equal mass. Both are thrown with equal speed against a wall. The putty sticks to the wall. The ball bounces back at nearly the same speed with which it hit the wall. Which object experiences the greater momentum change?
At the extremes (top and bottom) of the motion.
A mass is oscillating on a spring in periodic motion. Where is the force of the spring on the mass at a maximum?
At the extremes (top and bottom) of the motion.
A mass is oscillating on a spring in periodic motion. Where is the mass's acceleration at a maximum?
Neither, the accelerations are the same to both observers.
A passenger in a speeding train drops a peanut. Which is greater?
the net work done on the crate is zero joules
A person applies a 50 N force on a crate, causing it to move horizontally at a constant speed through a distance of 10 m. What is the net work done on the crate?
It doesn't matter; both will have the same effect on the car.
A person driving a car down the road at speed v sees an oncoming (practically identical) car in the same lane, also moving at speed v. In order to cause the least damage to the first car's occupants, what should the driver do? (The passengers of both vehicles are wearing seatbelts and going slowly enough that fortunately no serious harm is caused in either situation.)
is equal to zero
A person pushes a very heavy box across a horizontal floor. The work done by gravity on the box
both hit at the same speed
A person standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed is the one initially thrown
40 km/hr
A person starts in Boulder, drives to Denver (50 km away) in 1 hour, stays in Denver 1 hour, then speeds back to Boulder in 30 minutes. What is the average speed of this trip?
The speed at its highest point is less than its initial speed
A player kicks a soccer ball in a high arc toward the opponent's goal. When the soccer ball reaches its maximum height, how does its speed at this point compare to its initial speed? Assume air resistance is negligible.
The two balloons hit the ground at the same time.
A red water balloon is thrown horizontally from the top of a bridge. At the same instant, a yellow water balloon is dropped off the bridge from the same height. Compare the time of fall for the two balloons. Assume air resistance is negligible.
conservation of momentum.
A rocket is propelled forward by ejecting gas at high speed. The forward motion is a consequence of
15 km
A runner runs at a steady 15 km/hr. When the runner is 7.5 km from the end of the run, a bird begins flying from the runner to the end at 30 km/hr. When the bird reaches the finish line, it turns around and flies back to the runner, and then turns around again, repeating the back-and-forth trips until the runner reaches the finish line. How many kilometers does the bird travel?
The rotational speed has increased by a factor of 4.
A small puck on an air table revolves in a circle with rotational speed ω , held at radius r by a weighted string that passes through a hole in the table. You slowly pull down on the weighted end of the string, decreasing the radius r. Assume that the angular momentum of the puck about the hole remains constant. What is the rotational speed when half the string has been taken up?
6 seconds (P= change in energy/time)
A sports car accelerates from 0 to 30 mph in 1.5 seconds. How long does it take for the acc to 60 mph assuming the power derived by the engine is independent of velocity and neglecting friction.
6.0 s
A sports car accelerates from zero to 30 mph in 1.5 s. How long does it take for it to accelerate to 60 mph, assuming that the power delivered by the engine is independent of velocity and neglecting friction?
less than k
A spring, spring constant k, is doubled in length by adding an identical spring segment. The effective spring constant of the new combination is:
0.12T
A steel ball is hung from a vertical ideal spring where it oscillates in simple harmonic motion with a period T. At time t = 0 s, the ball is at its maximum displacement, A, from its equilibrium position. In terms of the period, at what time will the ball be at y = 0.75A?
7.0
A stone is launched straight up from ground level at a speed of 7.0 m/s. What is the x component of the velocity of the stone just before it hits the ground? Enter your answer as a number in units of m/s but do not write the units.
the swimmer should swim northeast
A swimmer is determined to cross a river that flows due south with a strong current. Initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. In which direction should the swimmer head?
Always downward
A tennis ball is thrown directly upward. Once it is released, its acceleration is:
neither
A truck is traveling at a constant 25 \rm m/s when a motorcycle speeds past at a constant 40 \rm m/s. On which vehicle, if either, is the magnitude of the vector sum of forces exerted on the vehicle greater?
is equal to zero
A woman holds a bowling ball in a fixed position. The work she does on the ball
less than it was
An ice boat is coasting on a frozen lake. From a bridge someone jumps straight down into the boat, which continues to coast straight ahead. The final velocity of the boat (with jumper) is:
either smaller than or equal to
An object goes from one point in space to another. After it arrives at its destination, its displacement is ____________________ the distance it traveled.
the object pulling upward on Earth
An object is at rest on a tabletop. Earth pulls downward on this object with a force equal in magnitude to mg. What is the interaction pair to this force?
The magnitude of the tension in the string is equal to the magnitude of the gravitational force on the object.
An object is hanging by a string from the ceiling of an elevator. The elevator is moving upward with a constant speed. What is the magnitude of the tension in the string?
The magnitude of the tension in the string is less than the magnitude of the gravitational force on the object.
An object is hanging by a string from the ceiling of an elevator. The elevator is slowing down while moving upward. What is the magnitude of the tension in the string?
The net force acting on the object is zero.
An object is moving with constant velocity. Which of the following best describes the force(s) acting on the object?
The net force is directed toward the center of the circular path.
An object moves in a circular path at a constant speed. What is the direction of the net force acting on the object?
The velocity and acceleration vectors are perpendicular.
An object moves in a circular path at a constant speed. What is the relationship between the directions of the object's velocity and acceleration vectors?
The work done on this object is zero.
An object moves with constant velocity. What can you say about the work done on a system that includes only this object?
same
BIG BEN and a little alarm clock both keep perfect time. Which minute hand has the bigger angular velocity w?
no
Can the average speed of an object moving in one direction ever be larger than the object's maximum speed?
yes
Can two cars traveling in opposite directions on a highway have the same speed?
υA/υB = -1/2
Carts A and B collide on a horizontal, low-friction track. Cart A has twice the inertia of cart B, and cart B is initially motionless. How does the change in the velocity of A compare with that of B?
positive
Consider an x axis on which positive values of x are to the right of the origin. For an object initially located to the left of the origin, is the x component of a displacement to the right:
It is closer to the Sun, than it is to either the Earth or Mars.
Consider the Earth and Mars in their orbit around the Sun. Where is the center of mass located for this three body system?
iii
Consider these situations: (i) a ball moving at speed υ is brought to rest; (ii) the same ball is projected from rest so that it moves at speed υ; (iii) the same ball moving at speed υ is brought to rest and then projected backward to its original speed. In which case(s) does the ball undergo the largest change in momentum?
No, no, no
Does an object moving in a circle always have centripetal acceleration? Does it always have rotational acceleration? Does it always have tangential acceleration?
The horizontal component of a projectile's acceleration is zero.
For general projectile motion, which of the following best describes the horizontal component of a projectile's acceleration? Assume air resistance is negligible.
The horizontal component of a projectile's velocity remains a constant.
For general projectile motion, which of the following best describes the horizontal component of a projectile's velocity? Assume air resistance is negligible.
Inversely proportional, inversely proportional
How is the acceleration of object 1 related to the acceleration of object 2 when the objects collide: (a) elastically, and (b) inelastically?
they are the same
I drop a bouncy ball and a brick from a height of 2 m above the floor. How do their speeds compare just before they reach the ground?
They both hit the ground at the same time
I drop a penny and a golf ball from the observation deck of the Leaning Tower of Pisa. What happens as they fall to the ground?
-6.3
If an object's initial position is xi = +6.5 m and its final position is xf = +0.23 m, what is the x component of its displacement? Give your answer in units of meters, but DO NOT WRITE the unit symbol.
the object is speeding up
If the net work done on an object is positive, what can you conclude about the object's motion?
the object's kinetic energy remains the same
If the net work done on an object is zero, what can you determine about the object's kinetic energy?
Fby book on Earth = Fby Earth on book
If you drop a book from a certain height, it falls (accelerating all the while) because of the gravitational force exerted by Earth on it. Because forces always come in interaction pairs, the book must exert a force on Earth. How does the magnitude of Fby book on Earth compare with the magnitude of Fby Earth on book?
The spring constant
If you know the mass of an object hanging from a spring in an oscillating system, what else do you need to know to determine the period of the motion?
the impulse is the same in both situations
In a lab environment, you are investigating the impulse of a force exerted on a brick when the brick's speed is reduced from 2.5 m/s to a complete stop. First, you allow the brick to slam into a secured piece of wood, bringing the brick to a sudden stop. Second, you allow the brick to plow into a large slab of gelatin so that the brick comes to a gradual halt. In which situation is there a greater impulse of the force on the brick?
The coefficient of static friction is greater than the coefficient of kinetic friction.
In general, how does the coefficient of static friction compare to the coefficient of kinetic friction for the same two materials?
larger than
In tug of war, suppose both people pull on the same end of the rope, each exerting a force F, while the other end is tied to a tree. The tension in the rope is ______________ than the tension when the two people pull on opposite ends.
equal to
In tug of war, suppose two people pull on opposite ends of a rope, each exerting a force F. They then tie one end of the rope to a tree, and one person pulls on the other end with a force F. The tension in the rope is ______________ than the tension when the two people pull on opposite ends.
No, yes
Is it possible for an object to have a nonzero acceleration if the object is traveling •(a) at constant velocity and •(b) at constant speed?
the rubber ball
It is late at night and after studying physics for hours, you and your friends have come up with a new game to play. You will attempt to knock down a large wooden bowling pin by throwing a ball at it. You have two balls of equal size and mass, one made of rubber and the other of silly putty. The rubber ball will bounce back after colliding with the pin, while the putty ball will stick to the pin. Which ball is most likely to topple the bowling pin (aka - which ball should you choose)?
its acceleration
Knowing all the forces exerted on an object gives you direct information about which aspect of the object's motion?
The truck travels twice as far as the car.
On a straight road, a car speeds up at a constant rate from rest to 20 m/s over a 5 second interval and a truck slows at a constant rate from 20 m/s to a complete stop over a 10 second interval. How does the distance traveled by the truck compare to that of the car?
4v
On the Moon, where air resistance is negligible, an astronaut drops a rock from a cliff and notes that the rock has a speed v after falling from its point of release for a time t. Assuming that the rock does not hit the ground first, how fast will it be moving after it has fallen for a time 4t from its point of release?
rotational speed increases
Standing on the edge of a rotating playground carousel, you take sight on the center of the carousel and walk directly toward that position. What happens to the rotational speed of the carousel as you walk?
You fall backwards. The axis around which you are free to rotate (your toes) is right up against the wall. Your center of mass is not right up against the wall; it is near the (back-to-front) center of your body. Hence the force of gravity exerted on you causes a torque that tends to rotate you backwards about your toes.
Standing with your toes touching the base of a wall, press your nose to the wall and try to stand on tiptoe. What happens and why? Choose the correct answer and explanation.
the angular velocity depends on the radius of the sphere and the height and the incline
Starting from rest, a solid sphere rolls without slipping down an incline plane. At the bottom of the incline, what does the angular velocity of the sphere depend upon?
6.0 km
Starting from your campsite you walk 3.0 km east, 6.0 km north, 1.0 km east, and then 4.0 km west. How far are you from your campsite?
yes
Suppose I have two cubes on a turntable at equal distances from the axis of rotation. The inertia of cube 1 is twice that of cube 2. Do both cubes begin sliding at the same instant if I slowly increase the rotational velocity?
megative
Suppose an object moves from an initial position xi = -1.2 m to a final position xf = -2.3 m without reversing its direction of travel. Is the x component of its average velocity:
both gain the same momentum
Suppose equal forces of 10 N are exerted on both objects (feather and brick) for 2 s. Which object gains more momentum?
speedometer reads a lower speed than the true linear speed
Suppose that the speedometer of a truck is set to read the linear speed of the truck, but uses a device that actually measures the angular speed of the tires. If after calibration, larger diameter tires are mounted on the truck, how will that affect the speedometer reading as compared to the true linear speed of the truck?
speedometer still reads the true linear speed
Suppose that the speedometer of a truck is set to read the linear speed of the truck, but uses a device that actually measures the angular speed of the tires. If after calibration, larger diameter tires are mounted on the truck, how will that affect the speedometer reading as compared to the true linear speed of the truck?
The rock has a downward acceleration of 9.8 m/s2.
Suppose that you toss a rock upward so that it rises and then falls back to the earth. If the acceleration due to gravity is 9.8 m/sec2, what is the rock's acceleration at the instant that it reaches the top of its trajectory (where its velocity is momentarily zero)? Assume that air resistance is negligible.
.5
The carts have masses m2 = 2m1. What is the ratio of the inertia of cart 1 to the inertia of cart 2?
contact forces
The force that causes a book sliding across a polished floor to eventually slow down, The force exerted by the wind on a sailboat, and The force that causes an object attached to one end of a stretched rubber band to move toward the object attached to the other end are known as what
depends on the height z.
The gravitational potential energy of a particle at a height z above Earth's surface
8.3 × 107 rad/s
The planet Mercury takes only 88 Earth days to orbit the Sun. The orbit is nearly circular, so for this exercise, assume that it is. What is the angular velocity, in radians per second, of Mercury in its orbit around the Sun?
The acceleration of object 1 is twice the acceleration of object 2.
The same net force is applied to two different objects. The second object has twice the mass of the first object. Compare the acceleration of the two objects.
.875 m
The see-saw is clearly unbalanced. Where should Susie sit so that she balances the 5kg mass at 1.25m and 10kg mass at 2m?
positive
The x component of the velocity of a car changes from -10 m/s to -2.0 m/s in 10 s. The direction of the change in velocity points in the _________________ direction.
The cans reach the ground at the same time.
Two cans of pumpkin roll down a loading dock ramp. They have identical inertias, but one of them has a larger radius (and a shorter length) than the other. Which one, if either, makes it down the ramp first?
the force applied at the doorknob exerts the greater torque
Two equal forces are applied perpendicular to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Which force exerts the greater torque?
the maximum height of the second ball is four times that of the first ball
Two identical balls are thrown vertically upward. The second ball is thrown with an initial speed that is twice that of the first ball. How does the maximum height of the two balls compare?
The two cars have the same change in momentum.
Two identical cars traveling at 20 m/s both slow to a stop. The driver of car A applies the brakes hard, so that the car comes to a stop in 3.0 s, while the driver of car B brakes gently and comes to a stop in 7.0 s. Which car has the greater change in momentum?
the two objects rise to the same height
Two objects are moving at equal speed along a level, frictionless surface. The second object has twice the mass of the first object. They both slide up the same frictionless incline plane. Which object rises to a greater height?
object 2 has three times the inertia of object 1
Two objects collide on a low-friction track. Object 1 experiences a magnitude of change in velocity ∣∣Δv1→∣∣ = 3 m/s, while object 2 has ∣∣Δv2→∣∣ = 1 m/s.
Inertia of iron > inertia of wood
Two objects of identical volume and shape are made of different materials: iron and wood. How do their inertias compare?
The canoe and person in it is moving faster
Two people are in a canoe, which is moving with velocity v. One person dives horizontally off the back of the canoe. Following this: (velocity)
zero
What are the magnitude and direction of the vector sum of the forces exerted on a car traveling on a straight downward slope of a highway at a constant 100 km/h?
Doubling the velocity doubles the magnitude of the momentum and increases the kinetic energy by a factor of four.
What does doubling an object's velocity do to its momentum and to its kinetic energy?
north
What is the direction of the Earth's orbital angular momentum as it spins about its axis?
5.8 kg⋅m/s
What is the momentum of a 0.012-kg bullet fired at 480 m/s ?
4.5 kg⋅m/s
What is the momentum of a 0.14-kg baseball pitched at 32 m/s .
parabola
What is the shape of the path of an object launched at an angle to the vertical, assuming that only the force of gravity is exerted on the object?
area under the curve
What represents the impulse of the force in a graph of force versus time?
position vs. time is parabolic
What shape do we expect for a graph showing the position of a motorcycle versus time if the motorcycle is speeding up with a constant acceleration?
the total momentum of the system is conserved
When a person steps forward out of a small boat onto a dock, the boat recoils backward in the water. Why does this occur?
the same
When the ladybug position is further towards the outside of the rotating disk, its angular velocity is _______ the angular velocity closer to the center.
greater than
When the ladybug position is further towards the outside of the rotating disk, its linear velocity is _______ the linear velocity closer to the center
increases
When you do positive work on a particle, its kinetic energy
The area under the curve
When you plot the force exerted on a particle as a function of the particle's position, what feature of the graph represents the work done on the particle?
neither they are both the same
Which has greater inertia: 1 kg of feathers or 1 kg of lead?
The carton filled with buckshot has the greater inertia
Which has greater inertia: a 1-quart milk carton filled with feathers or the same carton filled with buckshot?
0.90 kg m2/s
While excavating the tomb of Tutankhamun (d. 1325 BC), archeologists found a sling made of linen. The sling could hold a stone in a pouch, which could then be whirled in a horizontal circle. The stone could then be thrown for hunting or used in battle. Imagine the sling held a 0.050-kg stone; and it was whirled at a radius of 1.2 m with an angular speed of 2.0 rev/s. What was the angular momentum of the stone under these circumstances?
acceleration is nonzero, but its velocity is zero.
You are throwing a ball straight up in the air. At the highest point, the ball's
no
You are trying to open a door that is stuck by pulling on the doorknob in a direction perpendicular to the door. If you instead tie a rope to the doorknob and then pull with the same force, is the torque you exert increased?
They both hit the ground at the same time
You are watching (to protect students walking by) as your friend drops a large stone and a small stone out of the top floor window of JFT. What do you see as they reach the ground?
the downward trip
You throw a ball straight up in the air. If air resistance affects the motion of the ball, which takes longer?
1J
a 10kg block is sitting on the table. its in the way so you push it horizontally along the table for 1m with a force of 1N. How much work did you do on the block?
in the cart
a ball is launched directly upward from a moving cart. when it gets back to the launch height where will it land?
30 m/s
a baseball player hits a fly ball that has an initial v for which the horizontal component is 30 m/s and the verticle is 40 m/s what is the speed of the ball at its highest point?
depends on the weight of the box
a box is dropped from a height of 2m. while the box is falling, the work done by gravity on the box
they are equal due to different motion but same acceleration
a passenger in a speeding train drops a peanut. which is greater: the magnitude of the acceleration of the peanut measured by the passenger or by a person standing next to the train track or are they equal
is equal to zero
a person pushes a very heavy box across a horizontal floor. The work done by gravity on the load
no
a sweater that is hanging on a clothesline making it sag in the center. Could you tighten the clothesline completely enough to eliminate the sag comepletely?
is equal to zero
a woman holds a bowling ball in a fixed position. the work she does on the ball
the work done is zero
an object moves with constant velocity what can you say about the work done on a system that includes only this object
no
can two cars traveling opposite directions on a highway have the same velocity?
elastic collision
energy is conserved, momentum is conserved, and the magnitude of the relative velocity is conserved occurs in what type of collision
remains constant
for general motion which of the following best describes the horizontal component of a projectile's velocity?
the horizontal component of a projectile's velocity remains a constant
for general projectile motion, which of the following best describes the horizontal component of a projectile's velocity? assume air resistance is negligible
at the same time because time depends on the y direction
if we throw a penny straight out from the top floor of the empire state building when will it hit the ground compared to a penny dropped
coefficient of static friction is larger than the coefficient of kinetic friction
in a panic situation many drivers make the mistake of locking their brakes and skidding to stop rather than applying the brakes gentley. A skidding car takes longer to stop. why?
length, volume, speed, mass, energy, work, power
list of scalar quantities
displacement, velocity, acceleration, force
list of vector quantities
inelastic collision
momentum is conserved in what type of collision
person B has four times the power output of person A
person B does twice the work of person A and is one-half of the time. How does the power output of person B compare to person A.
rate at which work is done
power
energy
power is the rate at which ________ is transformed
specific to a number
scalar
watt
si unit of power
nonzero
the force exerted by a hand compressing a spring, the force exerted by Earth on a ball thrown upward, and the force exerted by the floor of an elevator on you as the elevator moves downward at constant speed the force-displacement is equal to
hit ground at the same time and have same velocity in the y direction
two same packages dropped. one from airplane flying due east the other from a hovering helicopter. what is true about the time they hit the ground and their velocities
has magnitude and direction
vector
parabola
what is the shape of the path of an object launched at an angle to the verticle assuming that only the force of gravity is exerted on the object
-hand compressing spring -earth on ball thrown upward -floor of an elevator on you as the elevator moves downward at a consistent speed
when does force displacement not equal 0
above the orange
you are attempting to hit an orange out of the tree. Where should you aim
200N
you push horizontally on a 100 kg crate at rest on the floor with a force of 200N. The crate does not move. The coefficient of static friction is .30. what is the force of static friction?
it increases in magnitude
you push horizontally on a crate at rest on the floor, gently at first and then with increasing force until you can't push harder. The crate does not move. What happens to the force of static friction between the crate and floor during this process?
downward takes longer because
you throw a ball straight up in the air. if air resistance affects the motion of the ball, which takes longer: the upward trip or the downward trip?
