03c - Friction and Spring Forces

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

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

• similar
• opposite
• parallel
• west

Tags

NGSS.HS-PS2-1

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

• surface area
• air resistance
• descent velocity
• gravity 

Tags

NGSS.MS-PS2-2

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

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

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

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

• True
• False

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

• True
• False

Which of the following statements is false?

• Friction can only slow things down

• Friction is never useful

• Friction can stop things from moving

What type of Friction is displayed with a bowling ball?

• sliding
• rolling
• static
• There is no friction