Friction is a force that acts in a(n) ___________ direction relative to a moving object.

• similar
• opposite
• parallel
• perpendicular

 What is the unit that measures force?

• Weight
• Net force
• Newton
• Kilogram

How would the absence of friction affect a marble traveling on a long, straight path?

• The marble’s speed would decrease.
• The marble’s speed would increase.
• The marble would stop immediately. 
• The marble would remain at a constant speed.

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What is the rate at which Earth's gravity accelerates objects in free fall?

• 9.8 m/s²
• 3.14159 km/hr/s
• 13.7 m/s²
• 42 km/h/s

How do you lower the friction force?

• By a smooth surface
• By a rough surface
• By not pushing hard
• By pushing down

Which would NOT be a way of reducing friction?

• making the surfaces smoother
• using lubricants such as waxes, oils, or grease
• changing from sliding friction to rolling friction using ball bearings
• Using kitty litter on snow and ice to help your car gain traction

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What does friction produce?

• light
• sound
• heat
• gravity

What is force?

• A force is a push or a pull upon an object resulting from the object's interaction with another object.
• something used in Star Wars 
• It is the amount of space between two points.
• It is Superman's power

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How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed
• less friction doesn't affect speed

What surface would have the most friction?

• Glass
• Marble
• Pool table
• Sandpaper