Year 7 Friction and Gravity

What two surfaces are in contact when:

You kick a ball

• Foot

• Shoe

• Ball

• Ground

What two surfaces are in contact when:

swim at the beach

• Foot

• Body

• Sand

• Water

What two surfaces are in contact when:

A car is driving

• Car

• Engine

• Wheels

• Road

What two surfaces are in contact when:

You are pedalling a bike

• Pedal

• Wheel

• Road

• Shoe

Reorder the following: Which surfaces have the least to most friction?

• Brick paving

• Cardboard

• Grass

• Sandpaper

• Tabletop

Match the following forces to their definitions.

• Opposing force between two surfaces that are touching

• Push

• Force moving towards the body

• Pull

• Force that pulls things down towards the ground

• Friction

• Force moving away from the body

• Gravity

True or False:

Friction acts in the same direction as an object's motion.

• True

• False

True or False:

The greater the weight of the object, the more friction it experiences.

• True

• False

True or False:

Friction makes a machine work better.

• True

• False

Which is not a way to reduce friction?

• Add a lubricant or oil

• Make the surface rougher

• Use a trolley or wheels

• Use a streamlined design