动量基础题

What are the two factors that affect the momentum of a moving car?

• speed and velocity

• time and mass

• distance and displacement

• mass and velocity

What are the two factors that affect the momentum of a moving car?

• speed and velocity

• time and mass

• distance and displacement

• mass and velocity

When a car's speed is doubled, its kinetic energy

• remains unchanged in accord with the conservation of energy.

• doubles

• quadruples

• decreases

Which object has the greatest momentum?

• An 18-wheeler tractor trailer at rest.
• An average mass person walking.
• A sports car driving on the highway.

Momentum is a ____________________ quantity

• science

• scalar

• vector

• energy

T/F: In a head-on collision between a big truck and a small car, the big truck will always have more momentum than the small car.

• True

• False

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. The railroad car is brought to a sudden stop while the boxcar moves away from the collision. At what speed will the second boxcar move?

• 18.6 m/s

• 9.3 m/s

• 7.5 m/s

• 1.86 m/s

What would happen to the momentum of a toy car if the mass is doubled and the velocity decreases by 1/2?

• It decreases by 1/4

• It decreases by 1/2

• Stays the same

• It is doubled

A 0.15 kg mass moving at +26 m/s is slowed to a stop by a force of -390 N. How long does it take the force to stop the mass?

• 0.01 s

• 0.001 s

• 0.02 s

• 0.23 s

A car is traveling 20 m/s. It takes 4 seconds with a 7,500 N force to come to a stop. What is the mass of the car?

• 150 kg

• 1,500 kg

• 37,500 kg

• 3,750 kg