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AP Physics Momentum

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Section 1

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Compared to a sports car moving at 30mph, the same sports car moving at 60mph has

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Date created

Mar 1, 2020

Cards (40)

Section 1

(40 cards)

Compared to a sports car moving at 30mph, the same sports car moving at 60mph has

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twice as much momentum

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A 2kg ball is thrown at 3m/s. What's the ball's momentum?

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6kg*m/s

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A table tennis ball launcher is fired. Compared to the impulse on the ball, the impulse on the launcher is

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the same

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A freight train rolls along the track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be

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double

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The momentum change of an object is = to the

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impulse

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Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can

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throw something heavy; the ball goes in one direction, the girl goes in the other with the same momentum

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Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped from a tower, they reach the ground at the same times, but A has a higher

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momentumIn

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Recoil is noticeable if you throw a heavy ball while standing on roller skates. If instead you go through the motions of throwing the ball but hold onto it, your recoil velocity will be

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zero, because you'll move back and fort, starting and stopping at the same spots.

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In order to increase the final momentum of a golf ball, we could

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increase the force acting on (swing as hard as possible), follow through when hitting the ball (increase the time of contact with the ball)

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Superman is at rest in space when he throws an asteroid that has much more mass than he does. Which moves faster?

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Superman b/c he has less mass, therefore more velocity b/c momentum is the same

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If the momentum of an object changes and it's mass remains constant,

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it's accelerating or decelerating (velocity is changing, there is a F)

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A piece of putty moving w/ 2 units of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both are set in motion w/ a combined momentum that is

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2 units of momentum

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A table tennis ball moving forward w/ five units of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of

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more than five units

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A 4 kg ball has a momentum of 20kg*m/s. What's the ball's speed?

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5m/s

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A collision is considered elastic if

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no lasting deformation, objects don't stick together, objects that collide don't get warmer, objects have the same shape after the collision as before the collision

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A ball is moving at 6m/s and has a momentum of 24kg*m/s. What's the ball's mass?

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4kg

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A table tennis ball launcher is fired. Compared to the force on the ball, the force on the launcher is

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the same

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Momentum of a system is only conserved when

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there is no net external force

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A cannon fires a cannonball. The speed of the cannonball will be the same as the speed of the recoiling cannon if

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the mass is also the same

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The reason padded dashboards are used in cars is that they

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increase the time of the impact of the collision

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A cannonball shot from a long-barrel cannon travels faster than one from a short-barrel cannon because the cannonball receives a greater

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impulse

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A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small b/c the

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cannon is much more massive

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While roller-skating, Granny collides w/ her tiny grandson Ambrose who is at rest. Ignoring any friction effects, Ambrose's speed after the collision will be greatest when

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he and Granny make a bouncing collision

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A piece of putty and a rubber ball have the same mass. If you drop them from the same height, which object will produce a greater impulse and whY?

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rubber ball b/c smaller v, same m, smaller time (b/c of bounce)

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In order to catch a ball, a baseball player moves their hand backward in the direction of the ball's motion. Doing this reduces the ball's force of impact on the player's hand mainly because

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the time of impact is increased

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A moving freight car runs into an identical car at rest on the track. The cars couple together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is

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one half as large

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If all people, animals, trains, and trucks all over the world began to walk or run towards the east, then

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Earth would spin a VERY SMALL bit slower, but not enough to be measured

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Which of the following has the largest momentum? A) a large parked truck B) a pickup truck traveling down the highway C) a tightrope walker crossing Niagara Falls D) the science building

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B

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Suppose an astronaut in outer space wishes to toss a ball against a very massive and perfectly elastic concrete wall and catch it as it bounces back. If the ball is as massive as the astronaut, then

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they will never be able to catch the original bounce because the astronaut goes away from the ball with the same momentum/speed

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Which has more momentum, an large truck moving at 30mph or a small truck moving at 30 mph?

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the large truck

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The force that accelerates a rocket into outer space is exerted on the rocket by

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the exhaust gases

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A 1N apple falls to the ground, hitting it with an impact force of

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1N

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A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has

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less stopping distance, more momentum (higher mass or speed)

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Two gliders having the same mass and speed move toward each together on an air track and stick together. After the collision, the velocity of the gliders is

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zero

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The force of an apple hitting the ground depends upon

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v of the apple before impact, t of impact with ground, whether or not it bounces, air resistance

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a 5 kg chink of putty moving at 10m/s collides with and sticks to a 7 kg bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of

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50kg*m/s (original p = final p)

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The momentum of an object is defined as the object's

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mass times velocity

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A small economy car (low mass) and a limo (high mass) are pushed from rest across a parking lot, = distances with = forces. The car the receives the greater impulse is the

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limo

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Suppose a cannon is made of a strong but very light material. Suppose also that the cannonball is more massive than the cannon itself. For such a system

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it is safer to stand in front of the cannon than behind it

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When you jump off a step, you bend your knees as you reach the ground. By doing this, the time of impact is about 10 times what it would be with a stiff-legged landing, and the average force on your body is reduced by about

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10 times

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