Friction and Net Force

A type of friction that occurs when air pushes against a moving object causing it to decelerate.

• surface area
• air resistance
• velocity
• gravity 

The amount of friction depends on the weight of the objects pressing together.

• True
• False

Wheels on a skateboard most likely experiences-

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

The rougher the surface, the faster an object will travel over the surface.

• True
• False

John stands at the top of a steep hill and pushes a ball over the edge with his foot. Which force causes the ball to continue rolling down the hill?

• mass
• gravity
• friction
• air resistance

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Which material should be used on a bicycle ramp to increase friction?

• shiny metal
• rough paper
• smooth wood
• wet plastic

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This is an example of what kind of force?

• Balanced Force
• Pushing Force
• Gravity Force
• Unbalanced Force

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If an object is stationary (not moving) the forces acting upon it are _____________

• unbalanced
• weak
• balanced
• Hulk Smash!

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If these boys are pulling with the same amount of force.  What will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

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With unbalanced forces, the object will move in the direction of the _______ force.

• larger 
• smaller 
• equal 

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