Friction

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

Tags

NGSS.MS-PS2-2

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

Rougher surfaces have ...

• greater friction
• less friction
• the same level of friction

Friction is a force that ________ the motion of an object.

• generates

• opposes

• creates

• adds to

Sally experiences-

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

Swimming fish experience-

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

Tags

NGSS.MS-PS2-2

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

• True
• False

Tags

NGSS.MS-PS2-2

What are 2 factors that determine the amount of friction between 2 objects?

• Force and roughness between surfaces
• hills and valleys and how smooth or rough the surface is
• Amount of force and amount of surface the comes in contact
• The force and the weight exerted on the surfaces

Which of the following is NOT an example of friction?

• using the brakes on your bike to slow you down

• putting your hand out the window

• a satellite traveling through deep space

• a hockey puck going across an ice rink

On which surface will a toy car travel the furthest?

• Carpet
• Polished Wood
• Ice

Tags

NGSS.MS-PS2-2