Friction 2

Which of the following is an example of friction that is harmful?

• Pencil marking on paper
• Engine parts wearing out
• sand placed on ice in the winter
• Using an eraser to erase marks

Friction is a force that acts in an ___________ direction of movement.

• similar
• opposite
• parallel
• west

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Which of the following is an example of rolling kinetic friction?

• box sliding across the floor
• bike rolling along the road
• car skidding to a stop
• soccer player making a slide tackle 

What are the 2 types of friction discussed in the book?

• Static and Dynamic Friction
• Kinetic and Static Friction
• Kinetic and Dynamic Friction
• Dynamic and Moving Friction

On which surface will a toy car travel the furthest?

• Carpet
• Polished Wood
• Ice

This car is turning, but there’s a puddle of water in the road. Which diagram best shows how the puddle will affect the path of the car after it hits the puddle?

• 
• 
• 
• 

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

• True
• False

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

Which of these materials do you predict would have the MOST amount of friction?

• metal

• tile

• sand paper

• denim