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# Momentum

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momentum questions review for physics
• What is the unit for momentum?
kg*m/s
•  15
• What are the 2 possible units for impulse?
N*s and kg*m/s
•  20
• If I am moving at 5 m/s, what is my momentum?
Can't solve without the mass.
•  10
• Which scientist did the work on momentum?
Newton
•  15
• If I bounce off another car in motion, my collision is called what?
elastic
•  10
• What are the 2 situations for INelastic collisions?
start together or end together
•  20
• Solve: Mass= 30 kg, velocity = -10 m/s , solve momentum
-300 kg*m/s
•  20
• Solve the final speed: 2 cars each with a mass of 2 kg are headed toward each other at 5 m/s, what would be the SPEED of each car after a perfect elastic collision?
5 m/s
•  20
• A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is A) zero. B) doubled. C) quadrupled. D) unchanged.
B) doubled.
•  15
• It is correct to say that impulse is equal to A) momentum. B) the change in momentum it produces. C) the force multiplied by the distance the force acts. D) velocity multiplied by time.
B) the change in momentum it produces.
•  15
• A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the A) force against the rifle is smaller than against the bullet. B) rifle has much more mass than the bullet.
B) rifle has much more mass than the bullet.
•  15
• Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater
momentum.
•  10
• To catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because..
time of impact is increased.
•  15
• When you jump you usually bend your knees upon reaching the ground. By doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. In this way the average force your body experiences would be...
10 x less
•  15
• A bullet is fired from a gun. The speed of the bullet will be about the same as the speed of the recoiling gun if the mass of the bullet...
if the mass of the bullet equals the mass of the gun.
•  15
• Padded dashboards in cars are safer in an accident than non-padded ones because an occupant hitting the dash has...(relate to time)
increased time of impact.
•  15
• The force on an apple hitting the ground depends upon A) the speed of the apple just before it hits. B) the time of impact with the ground. C) whether or not the apple bounces. D) all of these
D) all of these
•  15
• A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass?
16 kg
•  25
• A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?
3 m/s
•  25
• A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a total momentum of...
1 kg* m/s
•  25
• Compared to the force that brings a small car to a stop, the force required to bring a heavy truck to a stop A) is less. B) is more. C) is the same. D) impossible to determine without additional information
D) impossible to determine without additional information
•  15
• Which would produce more force: driving into a very massive concrete wall with no "give," or having a head-on collision at the same speed with an identical car moving toward you with the same speed? A) car B) wall C) both the same
C) both the same
•  20
• A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after this lunch is...
5/6 m/s
•  25
• You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?
both the same
•  20
• You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater force during the time of contact?
Both the same.
•  20
• Is this elastic or inelastic? Sam and Talia run towards each other, hit against each other, and BOUNCE off each other in opposite directions.
Elastic
•  15
• Spencer says something weird and Mr. Rodd says "take your hand and smash your face back and forth into your hand". Is their an Impulse happening to the hand?
YES!
•  15
• Spencer says something weird and Mr. Rodd says "take your hand and smash your face back and forth into your hand". Is their an Impulse happening to the hand?
YES!
•  15
• What should the boxer do to feel LESS force?
Move back with the punch
•  15
• Will the ball feel like more force if she moves toward it or away from it while catching the ball?
toward it
•  15
• What physics concept in one word is summed up by this graphic?
Impulse
•  15
• While Mr. Rodd is being chased by dinosaurs, he starts running faster, so he experiences a change of velocity, which means he experiences a _____________ of momentum?
change
•  15