Momentum Review Bellah

To find the momentum of an object you should multiply...

• mass times its velocity.

• force times the time interval.

• force times its acceleration.

• mass times its acceleration.

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Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour?

• Both have the same momentum.

• The small truck

• The large truck

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Two cars, A and B, have the same mass. Car A is doing 30 mph, and Car B is doing 60. Which of the following statements is true?

• Car B has twice as much momentum as Car A.

• Car B has four times as much momentum as Car A.

• Car B has the same momentum as Car A.

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If the momentum of an object changes,

• it is accelerating (or decelerating).

• there is a force acting on it.

• its velocity is changing.

• all of the above

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The momentum change of an object is equal to the

• impulse acting on it.

• velocity change of the object.

• force acting on it times its velocity.

• object's mass times the force acting on it.

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Why are air bags and padded dashboards used in cars?

• decrease the impulse in a collision.

• increase the force of impact in a collision.

• decrease the momentum of a collision.

• reduces the impact force by increasing the time of impact in a collision.

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

• larger.

• the same.

• smaller.

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A collision is considered elastic if

• there is no lasting deformation.

• the objects don’t stick together.

• after the collision, the objects have the same shape as before the collision.

• all of the above

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When a baseball player catches a ball in their glove they will move his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because

• the time of impact is decreased.

• the time of impact is increased.

• the velocity of the hand is reduced.

• the momentum of impact is reduced.

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

• 2kg·m/s

• 3kg·m/s

• 6kg·m/s

• 9 kg·m/s

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