Physics S2 Final Exam Review

If two objects are traveling at the same speed, but have different masses, which one will have more momentum?

• The object with greater mass

• The object with lesser mass

• Both have the same momentum

• Momentum does not depend on mass

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How would the momentum of the same object change, if it began to travel at a faster speed?

• The momentum would decrease.

• The momentum would stay the same.

• The momentum would increase.

• The momentum would become zero.

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Which of the following actions would cause the momentum of an object to change?

• Changing the object's mass

• Changing the object's velocity

• Applying a force to the object

• Keeping the object at rest

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A 15 kg ball is thrown at 6 m/s. What is the ball’s momentum?

• 21 kg·m/s

• 90 kg·m/s

• 45 kg·m/s

• 9 kg·m/s

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A cannon fires a cannonball. The forward speed of the cannonball is greater than the speed of recoil (backwards) of the cannon because:

• the cannonball has less mass than the cannon

• the cannonball has more mass than the cannon

• the forces on both are different

• the cannonball is fired at an angle

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The momentum of a baseball is 45 kg·m/s. If the ball has a speed of 17 m/s, what is its mass?

• 2.65 kg

• 3.5 kg

• 0.38 kg

• 0.75 kg

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A 8 kg bird flying in a straight line has a momentum of 17 kg·m/s. What is its velocity?

• 2.1 m/s

• 1.5 m/s

• 3.2 m/s

• 4.5 m/s

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If you jump off of the bleachers, why is it a good idea to bend your knees as you land? If landing with your knees locked shortens the impact time to 1/5 of the time compared to having your knee bent, how would landing with your knees locked affect the force on your body?

• It increases the force on your body.

• It decreases the force on your body.

• It has no effect on the force on your body.

• It makes you bounce higher.

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A kickboxer kicks the arm of his opponent. The force on the kickboxer's foot/leg compared to the force on his opponent’s arm is:

• Greater

• Less

• Equal

• Cannot be determined

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Bike helmets have a lining made of foam material because:

• The foam reduces the force by increasing the time over which the momentum changes during an impact.

• The foam makes the helmet heavier for better protection.

• The foam is only for comfort and has no effect on force or momentum.

• The foam increases the force during an impact.

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