PSC 1121 Chapters 1-4
inches per day; inches per day squared
Suppose that we chose inches as our basic unit of distance and days as our basic unit of time. What would the units of velocity be? units of acceleration?
Mechanics, thermodynamics, optics, electricity and magnetism
What are the subfields grouped together under the heading of classical physics?
The weight W of a mass m is calculated using the formula W = mg. Substitute the values in the formula: W= 85 kg × 9.81 m/s^2 =833.85 N
What is the weight of a 85-kg mass? Use g = 9.81 m/s2.
# of vehicles per distance
Which of the following best describes the term "vehicle density"?
downward
While on a rollercoaster, a rider goes through a loop. The rider never leaves their seat during the loop.The rider is still in contact with their seat, which means there must be a normal force directed _____________ on them when they are upside-down at the highest point in the loop.
no, the 45o will go further - Even though the cannonball launched at a 20o angle's horizontal velocity component is greater than that of the other shot, it falls sooner to the ground.
Will a shot fired from a cannon ball at a 20o launch angle travel for a longer distance than a 45o shot?
double
You are causing a wagon to accelerate by applying a force to it. If someone doubled the mass by adding stuff to the wagon and you wanted to keep the acceleration the same as it had been before, you must _________________ the force you apply.
$1.4/1L × 3.78357 L/1 gal = $5.297/gal
f gas costs $1.40 per liter, how much does a gallon of gas cost?
forces are
pushes, weight, friction equal and opposite
average speed formula
s = total distance/total time
Vo
the original velocity of an object when the motion started
normal force
the support force exerted upon an object that is in contact with another stable object Example: ground and a car
at
the velocity that is gained or lost due to acceleration
B. .2. Direction and magnitude must be added to get the net force, so 8-6 = 2 net force (they're going in opposite directions). 2/10 = .2
A 10kg box is attached to two strings, each on opposite ends of the box. The string on the right is pulled to the right with 6 N force while the left string is pulled to the left with 8 N. Due to these pulls, the box experiences an acceleration of ______________ m/s squared to the left (take the left direction to be positive). A. .8 B. .2 C. 8 D. 2
The mass m of the block is 9 kg. The acceleration a of the block due to the net force is 3 m/s^2. The net force F net acting on the block is calculated by the formula F net = m × a Substitute the values in the formula: F net=27 N
A 9-kg block being pushed across a table by a force P has an acceleration of 3 m/s2. What is the net force acting on the block?
The force F acting on the block is P, which is 38 N. The mass m of the block is 9 kg. The acceleration a of the block is 3 m/s2. Let us assume that the frictional force is f. We know that the net force F net is calculated using the formula F net = m × a. Since the net force F net is the difference between the force F acting on the block and the frictional force f, we can write the formula above as F − f = m × a. Hence, the frictional force can be calculated by using the formula f=F−m×a Substitute the values in the formula: f = 38 N− (9 kg×3 m/s^2) f = 11 Nf
A 9-kg block being pushed across a table by a force P has an acceleration of 3 m/s2. f the magnitude of P is 38 N, what is the magnitude of the frictional force acting upon the block?
B. the velocity is changing and the acceleration is not equal to zero As it moves in a circle the velocity of the ball at each instant is tangent to the circular path. Since this direction changes, the velocity changes even though the speed remains the same. Since the velocity is changing, the acceleration is not zero.
A ball is attached to a string and whirled in a horizontal circle such that it moves with constant speed. Which of the following statement is correct? a. the velocity is changing but the acceleration is equal to zero b. the velocity is changing and the acceleration is not equal to zero c. the velocity is constant but the acceleration is equal to zero d. the velocity is constant but the acceleration is not equal to zero
The velocity of upward motion is calculated using the formula: v= v0+at = 19 m/s + (-10 m/s^2 × 2 s) where v0 is the initial velocity, t is the time taken, and a is the acceleration due to gravity g. v = -1 m/s Minus sign indicates that the direction of velocity is downwards. Since the direction is against gravity, the value of g = -10 m/s.
A ball is thrown upward with an initial velocity of 19 m/s. The approximate value of g = 10 m/s2. Take the upward direction to be positive. What is the magnitude and the direction of the ball's velocity 2 seconds after it is thrown?
The velocity of upward motion is calculated using the following formula: v=v0+at v=19 m/s + (-10 m/s^2 × 1 s) = 9 m/s where v0 is the initial velocity, t is the time taken, and a is the acceleration due to gravity g. Since the direction is against gravity, the value of g = - 10 m/s^2.
A ball is thrown upward with an initial velocity of 19 m/s. The approximate value of g = 10 m/s2. Take the upward direction to be positive. What is the magnitude and the direction of the velocity of the ball 1 second after it is thrown?
the acceleration remains constant and downwards along the incline - The acceleration will be constant (and never zero) because it is due to gravity (Note: It is not g).
A ball rolls up an inclined plane, slows to a stop and then rolls back down. Which of the following statements about the acceleration of the ball is correct?
For an initial velocity of 800 m/s and a target distance of 200 m, the time required for the bullet to reach the target is calculated using the following formula: t= d/v0 =200m/800 m/s =0.25 s where v0 is the initial velocity (m/s), d is the distance in meters, and t is the time taken in seconds.
A bullet is fired horizontally with an initial velocity of 800 m/s at a target located 200 m from the rifle. How much time is required for the bullet to reach the target?
For the distance the bullet deviates from the target, the vertical distance is considered. To calculate the vertical distance, the initial velocity v0 is zero. Hence, the distance is calculated using the following formula: d= 1/2at^2 =10 m/s^2 × (0.25 s)^2 all over 2 =0.3125 meters where v0 is the initial velocity (m/s), t is the time taken in seconds, and a is the acceleration due to gravity g (m/s2). Now, we convert meters to centimeters using the conversion factor 1 meter = 100 centimeters. 0.3125 m × 100 = 31.25 centimeters
A bullet is fired horizontally with an initial velocity of 800 m/s at a target located 200 m from the rifle. Using the approximate value of g = 10 m/s2, how far does the bullet fall in this time?
Boogles per bop; boogles per bop; Boogles per bop squared
Suppose that critters are discovered on Mars who measure distance as boogles and time in bops. What would be the unit of speed? Unit of velocity? Unit of Acceleration?
nonzero As the car rounds the curve, the direction of its velocity changes. Since there is a change in velocity (direction even if not magnitude), it must have an acceleration.
A car traveling with a constant speed rounds a curve in the highway. What is the acceleration of the car?
65 MPH× 1.609344 km/hr /1 MPH = 104.6074 km/hr
A common speed limit in Vancouver, British Columbia, is 70 km/hr. You are going 65 MPH. What is your speed in km/hr?
One thousand milligrams make one gram. 8.3 ×10^6 mg × 1 grams/ 1000 mg = 8300g 8.3 ×10^6 mg × 1 grams/ 10^6 mg = 8.3 kg
A crate has a mass of 8.3 × 106 mg (milligrams). What is the mass of the crate in grams? kilograms?
A. the driver has accelerated Acceleration is the change in velocity per unit time. Here the change in velocity is negative (the velocity decreases), so the acceleration is also negative and opposite to the direction of velocity. This is often called a deceleration.
A driver steps on the brakes, causing the velocity of the car to decrease. Which of the following statements is correct? a. the driver has accelerated b. the driver has traveled with a constant velocity c. the driver has not accelerated d. the driver has kept their speed constant
no When a ball is dropped it moves in a constant direction (downwards), but the magnitude of its velocity (speed) increases as it accelerates due to gravity.
A dropped ball gains speed as it falls. Can the velocity of the ball be constant in this process?
3rd
A friend argues that there should never be a net force because newtons reaction/action principle should cause all forces to cancel out. You try to explain that according to the ____________ law, pairs don't cancel because they act on different objects.
D. In any of these case
A gusting wind blows against a sailboat with a force of 1000 N. The resulting acceleration of the boat will be largest A. When the sailboat's initial velocity is in the same direction as the wind B. When the sailboat's initial velocity is in the opposite direction as the wind C. When the sailboat is initially at rest D. in any of these cases
D. All are correct! The direction of motion has changed after the puck hits the wall, which represents a change in velocity since velocity involves both speed and direction.
A hockey puck is sliding on frictionless ice. It slams against a wall and bounces towards the player. In which of the following cases has the puck's velocity changed? a. if the ball comes back with the same speed it left with b. if the ball comes back with more speed than it left with c. if the ball comes back with less speed than it left with d. All of these choices are correct.
The speed of the rock is calculated using the following formula: v=v0+atv=v0+at where v0 is the initial velocity (m/s), a is the acceleration due to gravity (g = 10 m/s2), and t is the time taken in seconds (s). The initial velocity when the object is dropped is zero. v=v0+at v=0+(10m/s^2×12 s) v=120 m/s The conversion: 1 m/s = 2.2369 MPH v=(120×2.2369)MPH= 268.428 MPH
A large rock is dropped from the top of a high cliff. The air resistance can be ignored, and the acceleration due to gravity has a constant value of 10 m/s^2. What is the speed of the rock in MPH after 12 seconds of its drop? The conversion factor is 1 m/s = 2.2369 MPH.
The speed of the rock is calculated using the following formula: v = v0 + at v= 0 + (10m/s^2 × 12 s) v= 120 m/s where v0 is the initial velocity (m/s), a is the acceleration due to gravity (g = 10 m/s2), and t is the time taken in seconds (s). The initial velocity when the object is dropped is zero.
A large rock is dropped from the top of a high cliff. The air resistance can be ignored, and the acceleration due to gravity has a constant value of 10 m/s^2. What is the speed of the rock in m/s after 12 seconds of its drop?
both balls have the same acceleration due to gravity - The acceleration due to gravity does not depend on the mass of the object.
A lead ball and an aluminum ball, each 1 in. in diameter, are released simultaneously and allowed to fall to the ground. Due to its greater density, the lead ball has a substantially larger mass than the aluminum ball. Which of these balls, if either, has the greater acceleration due to gravity?
The height of the paperback is 280 mm. Since 10 mm = 1 cm, the height of the paperback is converted to cm as follows: 280 x 1/10 = 28cm The height of the paperback is 280 mm. Since 1000 mm = 1 m, the width of the paperback is converted to meters as follows: 280 x 1/1000 = .28
A paperback book is 280 mm in height. What is the height of the paperback in centimeters (cm)? millimeters (mm)?
Aristotle believed that the air rushed around the ball to fill the void of where it had been and this air pushed the ball forward
Aristotle believed that a force was necessary to keep an object moving. Where, in his view, did this force come from in the case of a ball moving through the air?
The initial velocity of the projectile v0 is taken as zero. The time taken is calculated using the following formula: t=v/a =100 m/s over 10 m/s^2 = 10 s where v0 is the initial velocity (m/s), t is the time taken in seconds (s), and a is the acceleration due to gravity g (m/s2).
A projectile is fired at an angle such that the vertical component of its velocity and the horizontal component of its velocity are both equal to 100 m/s. Using the approximate value of g = 10 m/s2, how long does it take for the ball to reach its high point?
he horizontal distance is calculated as follows: d=v0t =100 m/s × 10 s =1000 m
A projectile is fired at an angle such that the vertical component of its velocity and the horizontal component of its velocity are both equal to 100 m/s. What horizontal distance does the ball travel in this time?
187.5 x 1/12 = 15.625 ft
A small woman's foot is 7.5 inches long. She steps off the length of a room by placing one foot directly in front of the other and finds the room to be 25 foot-lengths long. What is the length of the room in feet (ft)?
The length of the room is calculated as the product of the length of the woman's foot, 7.5 inches, and the foot-length of the room, 25. This is given as follows: inches/ 1 foot length x foot length given = 187.5 inches
A small woman's foot is 7.5 inches long. She steps off the length of a room by placing one foot directly in front of the other and finds the room to be 25 foot-lengths long. What is the length of the room in inches?
the force of friction of the ground on the runner's shoes. The runner pushes his/her feet backward against the starting blocks. The reaction of the starting blocks on the runner is the force initially accelerating the runner.
A sprinter accelerates at the beginning of a 100-meter race and then tries to maintain a maximum speed throughout the rest of the race. Which of the following forces is responsible for accelerating the sprinter at the start of the race?
The velocity v is calculated using the following formula: v = v0 + at where v0 is the initial velocity (m/s), a is the acceleration due to gravity (g = 10 m/s^2), and t is the time taken in seconds (s). The initial velocity v0 is 0 m/s. The velocity of the steel ball when dropped from a diving platform is calculated as follows: v = 10m/s^2 × 2.4 seconds = 24 m/s
A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g as 10 m/s2 to solve the following problem: What is its velocity 2.4 seconds after its release?
The velocity v is calculated using the following formula: v = v0 + at where v0 is the initial velocity (m/s), a is the acceleration due to gravity (g = 10 m/s^2), and t is the time taken in seconds (s). The initial velocity v0 is 0 m/s. The velocity of the steel ball when dropped from a diving platform is calculated as follows: v = 10 m/s^2 × 0.9 seconds = 9 m/s
A steel ball is dropped from a diving platform (with an initial velocity of zero). Use the approximate value of g as 10 m/s2 to solve the following problem: What is the velocity of the ball 0.9 seconds after its release?
A thousand liters make one kiloliter. 5460 L × 1 kL /1000 L =5.46 kL 5460 L × 1000mL/ 1 L =5,460,000 mL
A tank holds 5460 L (liters) of water. What is the capacity of the tank in kiloliters (kL)? mili Liters?
the average speed for the trip is calculated using the following formula: s=d/t s = 420mi /8h = 52.5 mi/h s = 52.5 mi/h × 1km/0.6214mi =84.4866 km/h where s is the average speed, d is the distance traveled, and t is the time of travel.
A traveler covers a distance of 420 miles in a time of 8 hours. What is the average speed for this trip?
The average speed of the walker is calculated using the following formula: s=dt s = 2.8 km/ (34/60)h = 4.9412 km/h where s is the average speed, d is the distance traveled, and t is the time of travel.
A walker covers a distance of 2.8 km in a time of 34 minutes. What is the average speed of the walker for this distance in km/h?
inversely
Acceleration is directly proportional to the magnitude of the imposed force and ________________ proportional to the mass of the imposed force. Changing one results in the inverse change in the other.
D. The gravitational force of the apple on the Earth
An apple at rest on a table has two forces acting on it, the normal force and the gravitational force. The reaction force to the gravitational force is A. the normal force B. the table ruching up on the apple to make sure it doesn't fall C. there is not reaction force to gravity D. the gravitational force of the apple on the Earth
The acceleration of the ball can be calculated by using the formula a=F net/ m a = 9.88 N/2.4 kg =4.12 m/s^2
An upward force of 33.4 N is applied via a string to lift a ball with a mass of 2.4 kg. What is the acceleration of the ball?
The gravitational force W can be calculated by using the formula W = mg. W= 2.4 kg × 9.8 m/s^2 W=23.52 N
An upward force of 33.4 N is applied via a string to lift a ball with a mass of 2.4 kg. What is the gravitational force acting on the ball?
The net force acting upon the ball is Fnet=33.4 N−23.52 N Fnet=9.88 N
An upward force of 33.4 N is applied via a string to lift a ball with a mass of 2.4 kg. What is the net force acting upon the ball?
Because 1 m^2 = 1 m × 1 m, each meter must be converted to centimeters. This means 1 m^2 = 1 m × 1 m = 100 cm × 100 cm = 10000 cm^2.
Area is found by multiplying the length of a surface by its width. How many square centimeters are there in 1 m^2?
One square meter equals 10000 square centimeters. 2.34 m^2 × 10000cm^2 /1 m^2 = 23400 cm^2
Area is found by multiplying the length of a surface by its width. If a floor measures 2.34 m2, how many square centimeters does this represent?
Why did Aristotle believe that heavier objects fall faster than lighter objects?
Aristotle believed that heavier objects felt a larger force and a larger force made the object move faster.
when objects have hit terminal velocity - In the absence of air friction, Aristotle was wrong. In the presence of air friction, the shape and mass of the object can both affect the acceleration of a falling object. It is possible for a heavy object to fall faster than a light object and vice versa.
Aristotle stated that heavier objects fall faster than lighter objects. Is there a sense in which Aristotle's view could be considered correct?
The acceleration a of the rock is calculated using the formula a=F net/ m Substitute the values in the formula: a= 56.6 N/7 kg = 8.1 m/s^2 Since the downward force 68.6 N is greater than the upward force 12 N, the direction of the acceleration of the rock is downward.
At a given instant in time, an 7-kg rock that has been dropped from a high cliff experiences an upward force of air resistance of 12 N. What are the magnitude and direction of the acceleration of the rock? (Round the final answer to one decimal place.)
The mass m of the rock is 7 kg. The gravitational force W on the rock is determined using the formula W = mg. Substitute the values in the formula: W= 7 kg × 9.8 m/s2 W= 68.6 N
At a given instant in time, an 7-kg rock that has been dropped from a high cliff experiences an upward force of air resistance of 12 N. What is the gravitational force on the rock? Use g = 9.8 m/s2.
The net force acting on the rock is 68.6 N − 12 N = 56.6 N
At a given instant in time, an 7-kg rock that has been dropped from a high cliff experiences an upward force of air resistance of 12 N. What is the net force on the rock? (Note the directions of the two forces!) (Round the final answer to one decimal place.)
the front end At the front end of the traffic jam, the vehicle density is reduced due to the slower flow behind. Vehicles begin to accelerate and increase the distance between vehicles at the front end of the jam.
At which end of a traffic jam is the vehicle density lowest?
Galileo
Based his theory off of experiments and claimed that no force was needed to keep an object in motion, but rather a force was needed to halt an object's motion
Aristotle
Based his theory off of observations of nature and claimed that objects required a force to be applied to keep them in motion
Newton
Built his theory of motion off of the work of others and developed a quantitative model that more fully described how an object would react to a force.
The distance traveled by the car is calculated using the following formula: d = v0t+1/2at^2 d= (34 m/s ×7 s) + 1/2(-3 m/s^2 × (7 s)^2) = 164.5 m where d is the distance traveled, v0 is the original velocity, a is acceleration, and t is the time.
Consider a car moving in the positive direction with an initial velocity of 34 m/s slows down at a constant rate of -3 m/s2. What distance does the car cover in 7 seconds?
The velocity after 7 seconds of deceleration is calculated using the following formula: v=v0+at v=34 m/s + (-3 m/s^2 × 7 s) = 13 m/s where v is the final velocity, v0 is the original velocity, a is deceleration, t is the time, and at is the change in velocity due to the acceleration.
Consider a car moving in the positive direction with an initial velocity of 34 m/s slows down at a constant rate of -3 m/s2. What is its velocity after 7 seconds of deceleration?
of Newton
Galileo's work on motion preceded in the time that of
The weight of an object is the amount of force exerted on the object by gravity while the mass is the amount of matter in the object. -The weight of an object is the force of gravity on the object. An object in deep space with no planets or stars would have a weight of zero newtons. The mass of an object is the amount of matter which remains the same anywhere.
How is the mass of an object different from its weight?
gravity - The definition of free fall is that the only significant force acting on an object is the gravitational force.
If an object is in free fall, what forces are acting on it?
The area of a square of side b is b^2. If the area is increased by a factor of 36, then the increase in each side is obtained as follows: Increase in each side = increase in area √= 36‾‾‾√=6
If the area of a square has increased by a factor of 36, by how much has each side increased?
decrease
If you wish to increase an object's acceleration without changing the force on the object, you must ____________ its mass.
the higher trajectory - The higher trajectory takes longer. The time of flight is determined by the initial vertical velocity component, which also determines the maximum height reached.
In a diagram, two different trajectories are shown for a ball thrown by a center fielder to home plate in a baseball game. Which of the two trajectories (if either) will result in the longer time?
There are 60 seconds in 1 minute. The pulse rate is 120 beats in 60 seconds. The time period of the pulse is calculated using the following formula: 60s /120 = 0.5 s
Suppose Galileo's pulse rate was 120 beats per minute. What is the time in seconds between consecutive pulse beats?
the higher arched shot has a larger range of successful trajectories - The arched shot has the advantage of giving the shooter more leeway in getting the shot through the hoop—a wider range of trajectories that will make it.
In shooting a free throw in basketball, what is the primary advantage that a high, arching shot has over one with a flatter trajectory?
yes - Horizontal velocity is not influenced by vertical velocity. For example, a kicked ball has both horizontal and vertical velocity. The only change in velocity comes from acceleration due to gravity.
Is it possible for an object to have a horizontal component of velocity that is constant at the same time that the object is accelerating in the vertical direction?
First; Second
Newton's ____________ law applies when there is no force acting on an object, but Newton's _____________ law is for when there is at least one force on the object.
third
Newton's _____________ law contains the idea that forces are caused by interactions of two objects, each exerting a force on each other.
The average acceleration of the runner is calculated using the following formula: a=Δv/t a= 7 m/s/ 3s = 2.3333 m/s^2 where a is acceleration, Δv is the change in velocity, and t is the elapsed time.
Starting from rest and moving in a straight line, a runner achieves a velocity of 7 m/s in 3 seconds. What is the average acceleration of the runner?
The velocity of the car is calculated using the following formula: v=v0+at 6.2m/s, 12.4 m/s, 18.6 m/s, 24.8 m/s, and 31 m/s, respectively. d= v0t + 1/2at^2 3.1m, 12.4m, 27.9 m, 49.6 m, and 77.5
Starting from rest, a car accelerates at a constant rate of 6.2 m/s2 for a total of 5 seconds. Compute the velocity of the car at 1 s, 2 s, 3 s, 4 s, and 5 s. Compute distance traveled.
The velocity at the end of 3.5 seconds is calculated using the following formula: a = Δvt Hence, Δv = a×t Δv=5.7 m/s^2 ×3.5 s= 19.95 m/s where a is the acceleration, Δv is the change in velocity, and t is the elapsed time.
Starting from rest, a car accelerates at a rate of 5.7 m/s2 for 3.5 seconds. What is its velocity at the end of this time
The vertical distance of a falling object is calculated using the following formula: d= v0t + 1/2at^2 where v0 is the initial velocity (m/s), t is the time taken in seconds (s), and a is the acceleration due to gravity g (m/s2). The initial velocity v0 is taken as zero. The distance is calculated using the following formula: d= 1/2 × 10 m/s^2 × (0.5 s)^2 = 1.25 m We know that the object falls a distance of 1.25 m. The conversion factor is 1 m = 3.28084 foot. 1.25 m × 3.28084 ft/ 1 m= 4.101 ft
Suppose Galileo's pulse rate was 120 beats per minute. How far does an object fall in this time when dropped from rest? (Use g = 10 m/s2.) Then, What is this distance in feet?
1 minute is equal to 60 seconds. The beats per second is calculated as follows: 120 beats/60s =2 beats per second
Suppose Galileo's pulse rate was 120 beats per minute. How many beats per second is this?
the second runner If both runners cover the same distance in the same time interval, then their average velocity has to be the same and the area under the curves on a velocity-time graph are the same. If the first runner reaches maximum speed quicker, the only way the areas can be equal is if the second runner reaches a higher maximum speed which he then maintains over a shorter portion of the interval.
Suppose two runners run a 100-meter dash, but the first runner reaches maximum speed more quickly than the second runner. Both runners maintain constant speed once they have reached their maximum speed and cross the finish line at the same time. Which runner has the larger maximum speed?
The acceleration due to gravity is the same for both balls. They both accelerate at the same rate. The gravitational forces are different because their masses are different, but the forces are proportional to the mass. Thus the larger mass has a proportionally larger force on it, resulting in the same acceleration.
The gravitational force acting on a lead ball is much larger than that acting on a wooden ball of the same size. Which statement is true about when they are dropped?
True:
True or False: a graph showing a given object's acceleration as I depends on applied force would be a straight line of constant slope
less than - The tension in the connecting string is less than F. Both bodies have the same acceleration. The force F accelerates a total mass, 2m. The force in the connecting string accelerates a mass, m, so it is half of F.
Two block with the same mass are connected by a string and are pulled across a frictionless surface by a constant force, F , exerted by a string. The tension in the string connecting the boxes will be ____ the tension of the string exerting the force, F.
D. both boxes will accelerate - They will not move with constant velocity but with constantly increasing velocity. The applied force is constant, and this implies a constant acceleration. Constant acceleration results in constantly increasing velocity.
Two block with the same mass are connected by a string and are pulled across a frictionless surface by a constant force, F , exerted by a string. Which of the following statements is correct about what will happen to the boxes? a. they will both move with constant velocity b. the rightmost box will move with constant velocity while the leftmost box accelerates c. the leftmost will move with constant velocity while the rightmost box accelerates d. both boxes will accelerate
a smaller - The acceleration of an object is proportional to the force and inversely proportional to the mass. Since the force is the same, it is the mass difference that affects the acceleration. The mass is inversely proportional to the acceleration so a larger mass will experience a smaller acceleration.
Two equal forces act on two different objects, one of which has a mass ten times as large as the other. The larger object will have _________ acceleration that the less massive object.
the object is not accelerating in the horizontal direction - The acceleration of an object is proportional to the net force on the object. The net force on the object is zero, since the object is pulled to the right and to left by the same amount of force. If the net horizontal force is zero then the object does not experience any horizontal acceleration.
Two equal magnitude forces act on a box. What is true about it if the forces are in opposite directions? a. the object is accelerating to the right b. the object is accelerating to the left c. the object is accelerating both to the right and to the left d. the object is not accelerating in the horizontal motion
high density highway traffic jam When traffic is in a slowly moving jam, the average speeds of different vehicles are essentially the same, at least within a given lane.
Under what traffic conditions is the average speed of several vehicles equal to the average speed of the individual vehicles within the group?
less than the weight force. The normal force will be less than your true weight because the acceleration will be downward, making normal force a smaller arrow than the one representing the force of gravity; hence you will feel lighter.
You are in an elevator on the top floor of a large building when the elevator begins to accelerate downwards. In this scenario, the normal force on your feet will be
there is no normal force acting on you. The gravitational force is accelerating both the elevator and me downward at 9.8 m/s2 . The normal force does, however, equal zero.
You are in an elevator on the top floor of a large building when the supporting cable breaks and you find yourself in a condition of apparent weightlessness as the elevator falls.
C. a1=a2=a3 The accelerations of all three carts must be the same, because they start at the same speed and, being tied together, continue to move at the same speed. If they had different accelerations then they would separate from each other or collide.
You have three carts connected by strings. Assume their masses M1 , M2 , M3 are different from one another. If the acceleration of M1 is called a1 , the acceleration of M2 is called a2 and the acceleration of M3 is called a3, which of the following correctly states the relative size of each masses acceleration? a. a1 > a2 >a3 b. a1 < a2 <a3 c. a1 = a2 = a3 d. a2 > a1 >a3
200; 20
a 20 kg rock on Earth (g= 10 m/s^2) would weigh _________ N on Earth. It would have a mass of _____________ kg on the moon (g = 1.6 m/s^2).
A. 5
a box initially at rest experiences an acceleration of 5 m/s squared westward when acted on by a 100 N force. If the same box had an initial velocity of 2 m/s westward when the force was applied to it, then the resulting acceleration would be ______________ m/s squared westward. A. 5 B. 10 C. 15 D. 2
Distance Formula physics
d= 1/2at^2
nuclear, particle, atomic, and condensed matter physics
modern physics group
