Ch. 5 - Forces in Motion

1.  Beside a strength, or magnitude, what does every force have?

• gravity

• direction

• friction

• magnetism

2.  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

• grassy field

• paved road

• cement sidewalk

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3.  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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NGSS.MS-PS2-3

4.  What happens when an object accelerates?

• Its speed or direction changes

• Only its speed changes

• Only its direction changes

• It direction and speed do not change

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

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

• inertia

• gravity

• friction

• electricity

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6.  Friction is a kind of force.

• true

• false

7.  A car runs out of gas while moving forward on a flat, straight road.  The car keeps rolling for a while because...

• gravity pulls it forward

• magnetism is pushing it

• it has inertia

• it has acceleration

8.  Which of the following is a contact force?

• magnetism

• friction

• gravity

• electricity

9.  Which of the following is an example of uniform motion?

• an elevator going up at a constant speed

• an elevator slowing down

• an elevator speeding up

• a car going around a curve at a constant speed

10.  An airplane flies 3,200 miles in 4 hours.  What is its average speed in miles per hour?   (s=d/t)

• 80 mph

• 12,800 mph

• 800 mph

• 400 mph