Ch. 2 Forces and Motion

Besides a strength, or magnitude, what does every motion have?

• gravity

• direction

• friction

• magnetism

A ball is rolled across four different surfaces with the same force. Which surface will slow the movement of the ball the most?

• tile floor

• paved road

• grassy field

• cement sidewalk

How do electric and magnetic forces act on different objects?

• They only pull objects.

• They only push objects.

• They either push or pull objects.

• They only push or pull objects when they touch each other.

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What happens when an object accelerates?

• Its speed or direction changes.

• Only its speed changes.

• Only its direction changes.

• Its speed and direction do not change.

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When you ride a roller coaster, what makes your body rise out of its seat at the top of a hill?

• inertia

• gravity

• friction

• electricity

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How can you complete this sentence so it is always true?

The greater the net force acting on an object,

• the lesser the mass of the object.

• the greater the mass of the object.

• the lesser the acceleration of the object.

• the greater the acceleration of the object.

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What always happens when the forces acting on an object are equal in strength and opposite in direction?

• The object moves.

• The motion of the object does not change.

• The object does not move.

• The object becomes heavier.

When the sun is low in the sky early in the morning, trees form

• no shadows.

• short shadows.

• long shadows.

• all sizes of shadows.

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You are building a wooden car to enter in a downhill race. What can you do to make the car go as fast as possible?

• Make the car heavier.

• Give it a smooth surface.

• Make the shape compact.

• Make the surface bumpy.

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Describe a contact force and a non-contact force that affect the motion of a baseball after a pitcher has thrown the ball.

• Contact Force- air resistance slows the ball as it moves through the air.

• Contact Force- friction slows the ball as it rolls on the ground.

• Non-contact Force- gravity gradually pulls the baseball down.

• Non-Contact Force- static electricity pushes the ball forward.

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