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.
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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.
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25
A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?
3 m/s
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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
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15
Will the ball feel like more force if she moves toward it or away from it while catching the ball?
toward it
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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
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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.
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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
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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
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10
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.
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20
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
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20
What are the 2 situations for INelastic collisions?