Physics Final Evidence Review

Most modern vehicles have padded dashboards. This reduces collision injuries by...

• reducing the driver's change in momentum
• increasing the driver's change in momentum
• increasing the force of impact
• increasing the time of impact

The recoil speed of a rifle is much less than the exit velocity of a bullet because...

• the rifle experiences a smaller force
• the rifle experiences a smaller change in momentum
• the rifle has a much greater mass
• the rifle does not obey the laws of physics

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg*m/s
• 100 kg*m/s
• 250 kg*m/s
• 500 kg*m/s

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum

• Skater 2 experiences a greater change in momentum

• Skater 1 has a greater final velocity

• Skater 1 experiences a greater force

A block sliding on a frictionless surface runs into a second block of equal mass at rest. After the two collide, they stick together and travel with a velocity...

• that is twice the magnitude of the original velocity
• that is half the magnitude of the original velocity
• more information is needed

Two blocks begin at rest with an initial momentum of zero. After the spring is sprung, the two blocks move in opposite directions. What is the total final momentum?

• zero

• a positive value in the direction of the heavier block

• a positive value in the direction of the faster block

• more information is needed

Which image shows a neutral conductive pith ball after a positively charged balloon is brought near the left side, but doesn't touch?

• A

• B

• C

• D

Which image is NOT a conductor?

• A

• B

• C

• D

• NONE of the above

Which electrostatics phenomena is shown in this picture?

• Contact

• Friction

• Grounding

• Electron Shifting

This image shows the before picture, when a balloon is rubbed with polyester. Identify the correct after picture.

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