Study

# Momentum

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• 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
• 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.
• 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
• If I am moving at 5 m/s, what is my momentum?
Can't solve without the mass.
• 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
• 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!
• 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
• 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.
• 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.
• If I bounce off another car in motion, my collision is called what?
elastic
• A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?
3 m/s
• 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.
• 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
• What should the boxer do to feel LESS force?
Move back with the punch
• 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.
• What are the 2 situations for INelastic collisions?
start together or end together
• 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
• 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!
• Will the ball feel like more force if she moves toward it or away from it while catching the ball?
toward it
• 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.
• 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
• What physics concept in one word is summed up by this graphic?
Impulse
• What is the unit for momentum?
kg*m/s
• 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
• 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
• 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
• Which scientist did the work on momentum?
Newton
• What are the 2 possible units for impulse?
N*s and kg*m/s
• 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.
• Solve: Mass= 30 kg, velocity = -10 m/s , solve momentum
-300 kg*m/s
• 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
• 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.