FRICTIONAL FORCE

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

• similar
• opposite
• parallel
• west

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

• True
• False

Rougher surfaces have ...

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

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

Tags

NGSS.MS-PS2-1

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

The picture shows a boy pulling

a box. How can he move the box

more easily?

• Using wooden rollers.

• Put a cloth under the box and pull it using the cloth.

• Create a pattern on the surface of the box.

• Ensure the surface of the box is clean.

Tags

NGSS.3-5-ETS1-2

NGSS.3-PS2-1

Ways to reduce frictional force

• use lubricants

• use grease

• use magnesium carbonate chalk powder

• use rollers and ball bearings

Tags

NGSS.MS-PS2-2

If the type of surface is smoother, the distance traveled by the toy car will be (a)  

The frictional force (a)   caused the boy to fall.

The use of lubricants in motor vehicles ______________

the excessive frictional force in the engine

compartment.

• reduces

• increases

• reuses

• enlarge

Tags

NGSS.MS-ETS1-1