Friction

How does friction affect speed?

• more friction decreases speed

• less friction decreases speed

• more friction increases speed

• less friction doesn't affect speed

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

• similar

• parallel

• opposite

• west

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

• surface area
• air resistance
• velocity
• gravity 

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

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

What does friction produce?

• light
• sound
• heat
• gravity

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Without friction, an object in motion would never stop.

• true

• false

Tags

NGSS.MS-PS2-2

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

• true

• false

Rough surfaces have _________

• greater friction

• less friction

• the same level of friction

The shape of an object which helps in reducing friction

• circular shape

• streamlined

• flat

• none of the above