Friction, Gravity, Mass and Force Review

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate

• surface area
• air resistance
• descent velocity
• gravity 

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Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

James and Alex are kicking a ball back and forth. Alex kicks the ball in James’s direction, but the ball stops just before it reaches James. Which most likely caused the ball to stop?

• friction
• gravity
• change in mass of the ball
• change in shape of the ball

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Two toy race cars are going to be raced down the same ramp. Which information is most helpful in predicting which car will win the race?

• length of the ramp
• volume of the cars
• slope of the ramp
• mass of the cars

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Which of the following would increase the motion of a ball after it is kicked?

• a flat, grassy surface
• a smooth surface sloped uphill
• a smooth surface sloped downhill

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Pam ran down the sidewalk to school with her empty backpack. After school Pam’s backpack was loaded with books. Which best describes the force required to carry her book bag home?

• It took the same amount of force to carry the loaded book bag home.
• It took a greater amount of force to carry the loaded book bag home.
• It took a lesser amount of force to carry the loaded book bag home.

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Which is a force that keeps Earth in orbit around the Sun?

• friction
• gravity
• radiation
• magnetism

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A ball is kicked and rolls for a long distance across a field. Which eventually causes the ball to slow and stop?

• friction
• gravity
• motion
• position

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