Big Idea 13 #2

Maria roller skates to the top of a hill and then starts rolling downward. What are the MAIN forces affecting Maria’s motion as she rolls down the hill?

• gravity and magnetism

• speed and friction

• friction and gravity

• push and pull

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You can tell that an object has moved when its _________ has changed.

• position

• motion

• gravity

• friction

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What makes objects change speed or direction?

• Motion

• Force

• Friction

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The force that pulls objects toward the center of the Earth is called:

• a push or pull

• friction

• mass

• gravity

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The force that works against motion and tries to slow objects down is called:

• a push or pull

• mass

• friction

• gravity

Which of the following surfaces has the least amount of friction?

• a gravel driveway

• a dirt road

• a road covered with ice

• a road covered with spilled sand

Megan throws a paper airplane. How will gravity make the airplane move?

• in a straight line

• up toward the sky

• back toward Megan

• down toward the ground

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Which of the following is an example of movement caused by a non-contact force?

• A foot kicking a soccer ball

• Paperclips being pulled toward a magnet

• Shoes rubbing against the floor

• Wind pushing against a kite

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A boy is pulling his little sister in a wagon. If his older brother comes along and they pull on the wagon together, how will this increase in force affect the motion of the wagon?

• It will accelerate

• It will change direction

• It will continue unchanged

• It will remain at rest

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Two classes are playing tug-of-war. If the center of the rope is not moving, what must be true?

• Both classes are pulling equally.

• Both classes have equal mass.

• The ground is slippery.

• One class is pulling harder than the other.

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