Gravity and Friction

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

What type of friction acts on an object that is not yet moving?

• Static
• Dynamic
• kinetic
• Rolling

The wheels on a moving skateboard most likely experience ____________.

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

These swimmers are most likely experiencing _________.

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

As the child moves down the slide, they mostly experience the effect of ___________.

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

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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Which of the following is an example of rolling friction?

• pushing a box across the floor
• riding a bike down a hill
• a hockey player skidding to a stop
• a soccer player making a slide tackle 

Two factors affecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 
• mass and volume
• distance and weight 
• weight and mass

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As mass increases, what happens to the gravitational force?

• It increases.
• It decreases.
• It stays the same.
• It acts as a 3rd degree derivative function.

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