Q1 physics review
If the mass in a horizontal mass-spring system was doubled, the elastic potential energy in the system would change by a factor of a) 0 (no change) b) 1/2 c) 2 d) 4
a) 0 (no change)
A crate is carried in a pickup truck traveling horizontally at 15 m/s. The truck applies the brakes for a distance of 28.7 m while stopping with uniform acceleration. What is the coefficient of static friction between the crate and the truck bed if the crate does not slide? a) 0.4 b) 0.365 c) 0.892 d) 0.656
a) 0.4
An airplane with a mass of 1.2x10^4 kg tows a glider with a mass of 0.6x10^4 kg. If the airplane propellers provide a net forward thrust of 3.6x10^4 N, What is the acceleration of the glider? (Disregard Friction) a) 2 m/s^2 b) 3 m/s^2 c) 6 m/s^2 d) 9.8 m/s^2
a) 2 m/s^2
two perpendicular forces, one of 45 N directed upward and the other of 60 N directed to the right, act simultaneously on an object with a mass of 35 kg. What is the magnitude of the resultant acceleration of the object? a) 2.14 m/s^2 b) 3 m/s^2 c) 5.25 m/s^2 d) 1.41 m/s^2
a) 2.14 m/s^2
Which of the following statements does not describe force? a) Force causes objects at rest to remain stationary. b) Force causes objects to start moving c) Force causes objects to stop moving d) Force causes objects to change direction
a) Force causes objects at rest to remain stationary.
Why doesn't the principle of mechanical energy conservation hold in situations when frictional forces are present? a) Kinetic energy is not completely converted to a form of potential energy b) potential energy is completely converted to a form of gravitational energy c) Chemical energy is not completely converted to electrical energy d) kinetic energy is completely converted to a form of gravitational energy.
a) Kinetic energy is not completely converted to a form of potential energy
which of the following is the equation for average velocity? a) Vavg = 🔼x/🔼t b) Vavg = 🔼t/🔼x c) Vavg = 🔼x🔼t d) Vavg = (Vi -Vf )/ 2
a) Vavg = 🔼x/🔼t
Which of the following exhibits parabolic motion? a) a stone thrown into a lake b) a space shuttle orbiting Earth c) a leaf falling from a tree d) a train moving along a flat track
a) a stone thrown into a lake
in a coordinate system, the magnitude of the X component of a vector and theta, the angle between the vector and x-axis, are known. The magnitude of the vector equals the x component... a) divided by the cosine of theta b) divided by the sine of theta c) multiplied by the cosine of theta d) multiplied by the sine of theta
a) divided by the cosine of theta
when is there no air resistance, objects of different masses dropped from rest... a) fall with equal acceleration and with equal displacement b) fall with different accelerations and with different displacement c) fall with equal acceleration and with different displacements d) fall with different accelerations and with equal displacements
a) fall with equal acceleration and with equal displacement
objects that are falling towards earth in free fall move... a) faster and faster b) slower and slower c) at a constant velocity d) slower than faster
a) faster and faster
As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is... a) greater than the player's weight b) equal in magnitude and opposite in direction to the player's weight c) less than the player's weight d) zero
a) greater than the player's weight
what does the graph above illustrate about acceleration (velocity vs time, (0,1) to (4,4) to (7,2) to (10,6)) a) the acceleration varies b) the acceleration is zero c) the acceleration is constant d) the acceleration increases then becomes constant
a) the acceleration varies
Work is done when a) the displacement is not zero b) the displacement is zero c) the force is zero d) the force and displacement are perpendicular
a) the displacement is not zero
a hockey stick hits a puck on the ice. Identify an action-reaction pair in this situation. a) the stick exerts a force on the puck; the puck exerts a force on the stick. b) the stick exerts a force on the puck; the puck exerts a force on the ice. c) the puck exerts a force on the stick; the stick exerts a force on the ice d) the stick exerts a force on the ice; the ice exerts a force on the puck.
a) the stick exerts a force on the puck; the puck exerts a force on the stick.
An ice skater moving at 10 m/s coasts to a halt in 100 m on a smooth ice surface. What is the coefficient of friction between the ice and the skates? a)0.025 b) 0.051 c) 0.102 d) 0.205
b) 0.051
how many displacement vectors shown in the figure above have components that lie along the y-axis and are pointed in the -y direction a) 0 b) 2 c) 3 d) 5
b) 2
How much elastic potential energy is stored in a bungee cord with a spring constant of 10 N/m when the cord is stretched 2 m? a) 10 J b) 20 J c) 40 J d) 200 J
b) 20 J
according to the graph above, during which interval is the cat at rest? (displacement vs time graph) a) 0.0-5.0 s b) 5.0-10.0 s c) 10.0-15.0 s d) 15.0-20.0 s
b) 5.0-10.0 s ( where the displacement is neither increasing or decreasing)
A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0 degrees above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle? a) 53.0 N b) 70 N c) 65.2 N d) 95.6 N
b) 70 N
What is the potential energy of a 1 kg mass 1 m above the ground? a) 1 J b) 9.8 J c) 10 J d) 96 J
b) 9.8 J
in the figure above, the magnitude of the ball's velocity is least at location a) A b) B c) C d) D
b) B
In which of the following scenarios is no net work done a) A car accelerates down a hill b) a car travels at constant speed on a flat road. d) a car decelerates on a flat road. d)a car decelerates as it travels up a hill
b) a car travels at constant speed on a flat road.
What is the path of a projectile ( in the absence of friction) a) a wavy line b) a parabola c) a hyperbola d) Projectiles do no follow a predictable path
b) a parabola
A force does work on an object if a componenet of the force... a) is perpendicular to the displacement of the object b) is parallel to the displacement of the object c) perpendicular to the displacement of the object moves the object along a path that returns the object to its starting position d) parallel to the displacement of the object moves the object along a path that returns the object to its starting position
b) is parallel to the displacement of the object
Which of the following parameters does not depend on how resistant a spring is to being compressed or stretched? a) compression distance b) relaxed length c) spring constant d) stretching distance
b) relaxed length
identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free fall acceleration a) vector scalar scalar b) scalar scalar vector c) vector scalar vector d) scalar vector vector
b) scalar scalar vector
the graph above describes the motion of a cyclist. (velocity vs time, positive slope of 1) during the interval shown, the cyclist is a) slowing down b) speeding up c) traveling at the same speed d) at rest
b) speeding up
A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair in this situation. a) the tree exerts a force on the leaf; the sidewalk exerts a force on the leaf. b) the leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf. c) the leaf exerts a force on the tree; the sidewalk exerts a force on the leaf. d) the leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.
b) the leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.
The magnitude of the gravitational force acting on an object is... a) frictional force. b) weight c) inertia d) mass
b) weight
the graph above describes the motion of a ball. (speed vs time graph from (-5,-5) to (5,5) slope of 1/2) at what point does the ball have an instantaneous rate if zero? a) (-4,-2) b) (-2,-1) c) (0,0) d) (2,1)
c) (0,0)
What is the kinetic energy of a 0.135 kg baseballl thrown at 40 m/s? a) 54 J b) 87 J c) 108 J d) 216 J
c) 108 J
A construction worker pushes a wheelbarrow 5 m with a horizontal force of 50 N. how much work is done by the worker on the wheelbarrow? a)10 J b) 55 J c) 250 J d) 1250 J
c) 250 J
a 3 kg toy falls from a height of 1 m. What will the kinetic energy of the toy be just before the toy hits the ground? a) 0.98 J b) 9.8 J c) 29.4 J d) 294 J
c) 29.4 J
for the winter, a duck flies 10.0 m/s due south sharing a gust of wind with speed of 2.5 m/s. what is the resultant velocity of the duck? a) 12.5 m/s south b) -12.5 m/s south c) 7.5 m/s south d) -7.5 m/s south
c) 7.5 m/s south
A sculpture is suspended in equilibrium by two cables, one from a wall and the other from the ceiling of a museum gallery. Cable 1 applies a horizontal force to the right of the scupture and has a tension, F1. Cable 2 applies a force upward and to the left at an angle of 37.0 degrees to the negative x-axis and has a tension, F2. The gravitational force of the sculpture is 5x10^3 N. What is F2? a) 4440 N b) 6640 N c) 8310 N d) 3340 N
c) 8310 N
In which of the following sentences is work used in the everyday sense of the word? a) Lifting a heavy bucket involves doing work on the bucket. b) the force of friction usually does negative work. c) Sam and Rachel worked hard pushing the car d) work is a physical quantity
c) Sam and Rachel worked hard pushing the car
a football player runs in one direction to catch a pass, then turns and runs twice as fast in the opposite direction toward the goal line. which of the following is a correct expression for the original velocity and the resulting vector a) -V player, -2V player b) V player, 2V player c) V player, -2V player d) 2V player, -V player
c) V player, -2V player
In which of the following scenarios is work done? a) a weightlifter holds a barell overhead for 2.5 s b) a construction worker carries a heavy beam while walking at a constant speed along a flat surface c) a car decelerates while traveling on a flat stretch of road. d) a student holds a spring in a compressed position
c) a car decelerates while traveling on a flat stretch of road.
a Free-body diagram of a ball falling in the presence of air resistance would show a) only a downward arrow to represent the force of air resistance b) only a downward arrow to represent the force due to gravity c) a downward arrow to represent the force due to gravity and an upward arrow to represent the force of air resistance d) an upward arrow to represent the force due to gravity and a downward arrow to represent the force of air resisitance
c) a downward arrow to represent the force due to gravity and an upward arrow to represent the force of air resistance
Which of the following does not exhibit parabolic motion? a) a frog jumping from land into water b) a basketball thrown to a hoop c) a flat piece of paper released from a window d) a baseball thrown to home plate
c) a flat piece of paper released from a window
which of the following is not an example of projectile motion? a) a volleyball served over a net b) a baseball hit by a bat c) a hot-air balloon drifting toward earth d) a long jumper in action
c) a hot-air balloon drifting toward earth
A free-body diagram represents all of the following except a) the object. b) forces as vectors c) forces exerted by the object. d) forces exerted on the object
c) forces exerted by the object.
which of the following is a coordinate system for specifying the precise location of objects in space? a) x-axis b) y-axis c) frame of reference d) diagram
c) frame of reference
suppose you are given a position versus time graph. the slope of the line drawn tangent to the point on the curve of this graph describes what quantity? a) acceleration b) displacement c) instantaneous velocity d) position
c) instantaneous velocity
The length of a force vector represents the a) cause of force. b) direction of the force. c) magnitude of the force. d) type of force
c) magnitude of the force.
Friction converts kinetic energy to a) mechanical energy b) potential energy c) mechanical energy and mass d) kinetic energy and mass
c) mechanical energy and mass
Which of the following are examples of conservable quantities? a) potential energy and length b) mechanical energy and length c) mechanical energy and mass d) kinetic energy and mass
c) mechanical energy and mass
which of the following units is the SI unit of velocity? a) meter b) meter*second c) meter per second d) second per meter
c) meter per second
in a coordinated system, a vector Is oriented at an angle ° with respect to X-axis. the y component of the vector equals the vectors magnitude multiplied by which trig function? a) cos ° b) cot ° c) sin ° d) tan °
c) sin °
A hammer drives a nail into a piece of wood. Identify an action-reaction pair in the situation. a) The nail exerts a force on the hammer; the hammer exerts a force on the wood. b) the hammer exerts a force on the nail; the wood exerts a force on the nail. c) the hammer exerts a force on the nail; the nail exerts a force on the hammer d) the hammer exerts a force on the nail; the hammer exerts a force on the wood.
c) the hammer exerts a force on the nail; the nail exerts a force on the hammer
The statement by Newton that for every action there is an equal and opposite reaction is which of his laws of motion? a) First b) second c) third d) fourth
c) third
A change in the gravitational force acting on an object will affect the object's a) mass b) coefficient of static friction c) weight d) inertia
c) weight
which of the following is the best coordinated system to analyze a painter climbing a later at an angle of 60° to the ground? a) x-axis: horizontal along the ground; y-axis: along the ladder b) x-axis: along the ladder, y-axis: horizontal along the ground c) x-axis: horizontal along the ground; y-axis: up and down d) x-axis: along the ladder; y-axis: up and down
c) x-axis: horizontal along the ground; y-axis: up and down
a student walks from the door of the house to the end of the driveway and realizes that he missed the bus. the student runs back to the house, traveling three times as fast. which of the following is the correct expression for the return velocity if the initial velocity is Vstudent? a) 3Vstudent b) (1/3)Vstudent c) -(1/3)Vstudent d) -3Vstudent
d) -3Vstudent
A sled traveling at a speed of 3 m/s slows to a stop 4 m from the point where its passenger rolled off. What is the magnitude of the horizontal net force that slows the 110 N sled? (acceleration of gravity = 9.81 m/s^2) a) 130 N b) 34 N c) 37 N d) 13 N
d) 13 N
Find the resultant of these two vectors: 2.00x10^2 units due east and 4.00x10^2 units 30.0 degrees north of west a) 300 units, 29.8 degrees north of west b) 581 units, 20.1 degrees north of east c) 546 units, 59.3 degrees north of west d) 248 units, 53.9 degrees north of west
d) 248 units, 53.9 degrees north of west
an ant on a picnic table travels 3.0*10^1 cm eastward, then 25 cm northward, and finally 15 cm westward. what is the magnitude of the ants displacement relative to its original position? a) 70 cm b) 57 cm c) 52 cm d) 29 cm
d) 29 cm
What are the units for a spring constant? a) N b) m c) N*m d) N/m
d) N/m
Which of the following equations expresses the work-kinetic energy theorem? a) MEi=MEf b) Wnet=changePE c) changeW=changeKE d) Wnet=changeKE
d) Wnet=changeKE
which of the following situations represents a negative displacement? (positive is up) a) a cat stands on a tree limb b) a cat jumps from the ground onto a tree limb c) a cat jumps from a lower tree limb to a higher one d) a cat jumps from a tree limb to the ground
d) a cat jumps from a tree limb to the ground
Which of the following has the greatest power output? a) a weightlifter who lifts a 250 N car 2.1 m in 3.0 s b) a mechanic's lift that raises a 1.2x10^4 N car 2.1 m in 12 s c) a car engine that does 1.2x10^5 J of work in 5 s d) a crane that lifts a 2.5x10^4 N beam at a speed of 1.2 m/s
d) a crane that lifts a 2.5x10^4 N beam at a speed of 1.2 m/s
For which of the following situations is the conservation of mechanical energy most likely to be a valid assumption? a) A skateboard rolls across a sewer grate b) a parachutist falls from a plane c) you rub your hands together to keep warm d) a soccer ball flies through the air
d) a soccer ball flies through the air
which of the following line segments on a position versus time graph is physically impossible? a) a horizontal line b) a straight line that slope to the left c) a straight line that slopes to the right d) a vertical line
d) a vertical line
Which are simultaneous equal but opposite forces resulting from the interaction of two objects? a) net external forces b) field forces c) gravitational forces d) action-reaction pairs
d) action-reaction pairs
The equation for determining gravitational potential energy is PEg=mgh. Which factor(s) in this equation is (are) not intrinsic to an object? a) m b) g c) h d) both g and h
d) both g and h
Which form of energy is involved in weighing fruit on a spring scale? a) kinetic energy b) non mechanical energy c) gravitational potential energy d) elastic potential energy
d) elastic potential energy
Which of the following energy forms is associated with an object in motion? a) potential energy b) elastic potential energy c) non mechanical energy d) kinetic energy
d) kinetic energy
A measure of the quantity of matter is a) density b) weight c) force d) mass
d) mass
In the presence of frictional force, a) non-mechanical energy is negligible and mechanical energy is no longer conserved. b) non-mechanical energy is negligible and mechanical energy is conserved c) non-mechanical energy is no longer negligible and mechanical energy is conserved. d) non-mechanical energy is no longer negligible and mechanical energy is no longer conserved
d) non-mechanical energy is no longer negligible and mechanical energy is no longer conserved
A crate is released on a friction-less plank inclined at angle theta with respect to the horizontal. Which of the following relationships is true? ( assume that the x-axis is parallel to the surface of the incline.) a) Fy=Fg b) Fg=0 c) Fy=Fx d) none of the above
d) none of the above
the graph above describes the motion of a ball. (speed vs time graph from (-5,-5) to (5,5) slope of 1/2) at what point is the velocity of the ball equal to its velocity at B ? a) (-4,-2) b) (0,0) c) (2,1) d) none of the above
d) none of the above
The free body diagram shown above represents a car being pulled by a towing cable. In the diagram, the 5800 N force is a) the gravitational force acting on the car b) the backward force the road exerts on the car c) the upward force the road exerts on the car d) the force exerted by the towing cable on the car
d) the force exerted by the towing cable on the car
A car goes forward along a level road at a constant velocity. The additional force needed to bring the car into equilibrium is a) greater than the normal force times the coefficient of static friction. b) equal to the normal force times the coefficient of static friction c) the normal force times the coefficient of kinetic friction d) zero
d) zero
If the displacement of a horizontal mass-spring system was doubled the elastic potential energy in the system would change by a factor of... a) 1/4 b) 1/2 c) 2 d)4
d)4
