Force and Motion Review

Jack fills a wagon with rocks and pushes down the hill to Jill. Some of the rocks fall out which makes the wagon go faster. Why did the wagon go faster?

• because of the friction between the wagon and grass

• because the mass of the rocks decreases

• because the force on the wagon increases

• because the force of gravity increases.

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Which one is an increase in friction?

• putting sand on ice

• reducing the weight of an object

• pouring oil in an engine

• waxing a surboard

Bobby is pulling a cart at a constant speed. If groceries were added to the cart, what would most likely have to happen for Bobby to continue pulling the cart at the same speed?

• The force of gravity would need to increase

• The mass of the cart would need to increase

• The force pulling the cart would need to increase

• The amount of friction would need to increase

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Sue pushed these two balls on the same surface with her hands and recorded the distance. Which answer is the distance of Hit 1

• 10 feet

• 35 feet

• 50 feet

• 100 feet

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Which statement best describes the motion of the object from 3 to 4 seconds?

• moving at a constant speed

• decreasing in speed

• moving backwards

• not moving

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A person is pushing a shopping cart. Which best describes what is occurring?

• Mass is being applied to the shopping cart

• Force is being applied to the shopping cart

• no friction is acting on the shopping cart

• no gravity is acting on the shopping cart

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I went sledding down a steep hill. I put my feet down in the snow to slow down the sled. What caused the sled to decrease its speed?

• an increase in mass

• an increase in friction

• an increase in gravity

• an increase in temperature

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If both balls were pushed with same amount of force, what will most likely happen as the balls roll forward?

• Ball X will roll slower than Ball Y because it has more mass

• Ball Y will roll slower than Ball X because it has more mass

• Ball X and Ball Y will roll at the same speed

• Ball X will roll slower because it has less friction on it than Ball Y

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Jack and Jill pull opposite ends of a rope. Neither person was able to move the rope? What can be said about the force used by each person?

• Jack and Jill used no force

• Jack and Jill used equal force

• Jack exerted less force than Jill

• Jack exerted more force than Jill

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May ran her first race of 1,000 meters at a rate of 50 meters per minute. May ran her second race of 1,000 meters at a rate of 40 meters per minute. Which statement is true.

• Both races were completed in the same time

• Her first race took a longer amount of time to complete

• Her second race was completed faster than her first race

• Her second race took a longer amount of time to complete