Forces and Motion Review

What is the difference between average speed and constant speed?

• Average speed is the total distance divided by total time, while constant speed means the speed does not change.

• Average speed is the speed at a specific moment, while constant speed varies over time.

• Average speed is always higher than constant speed.

• Average speed is the speed of light, while constant speed is slower.

A golf cart travels at a constant speed of 0.10 km/min. It is driven for two hours. What is the total distance traveled?

• 12 km

• 10 km

• 20 km

• 15 km

What formula is used to calculate momentum?

• Momentum = mass × velocity

• Momentum = mass + velocity

• Momentum = mass ÷ velocity

• Momentum = mass - velocity

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What does the Law of Conservation of Momentum state?

• The total momentum of a closed system is constant if no external forces act on it.

• Momentum can be created or destroyed in a closed system.

• The total momentum of a closed system increases over time.

• Momentum is always zero in a closed system.

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Which type of friction is shown in the picture above?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Describe the action and reaction forces in the picture above.

• The rocket pushes down on the ground, and the ground pushes up on the rocket.

• The rocket pushes air backward, and the air pushes the rocket forward.

• The rocket pulls the air forward, and the air pulls the rocket backward.

• The rocket pushes the air upward, and the air pushes the rocket downward.

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An astronaut on the moon would have the same ___ as on Earth.

• mass

• weight

• height

• speed

Explain why highways have speed limit signs rather than velocity limits.

• Speed is a scalar quantity and easier to measure.

• Velocity includes direction, which is unnecessary for speed limits.

• Speed limits are based on average car speeds.

• Velocity is only used in scientific experiments.

State Newton’s First Law of Motion.

• An object in motion stays in motion unless acted upon by an external force.

• Force equals mass times acceleration.

• For every action, there is an equal and opposite reaction.

• Energy cannot be created or destroyed.

State Newton’s Second Law of Motion.

• An object at rest stays at rest unless acted upon by an external force.

• Force equals mass times acceleration.

• For every action, there is an equal and opposite reaction.

• The total energy of an isolated system remains constant.

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