SIE 3 Chapter 6 Friction & Gravity

Min wants to find the exact difference in the amount of force needed to lift a soccer ball and a tennis ball.

What is the best method?

• Lift each ball in one hand at the same time

• Lift the two balls one after the other

• Use a forcemeter

• Use a weigh scale

Rahim’s car skids on a dry road.

He goes to a car mechanic who inspects the car.

He says that there is a problem with the tyres.

The surface of the tyres has become ....

• less

• more

• rough

• smooth

Rahim’s car skids on a dry road.

He goes to a car mechanic who inspects the car.

He says that there is a problem with the tyres.

There is ... friction between the tyres and the road surface

• less

• more

• rough

• smooth

Vincent is walking.

A banana peel is on the ground.
Vincent slips on the banana peel and falls.

What happens to the amount of friction when Vincent steps on the banana peel?

An apple falling on the ground is one example of ... force.

(a)  

Gravity is a type of force.

Tick the box next to the correct statement

• Gravity pulls all objects towards the Earth

• Gravity pulls some objects towards the Earth

• Gravity pushes all objects away from the Earth

• Gravity slows down all moving objects

Karen goes down a slide. Which two forces are acting on her?

Complete the sentence.

... between her body and the slide slows her down.

(a)  

Karen goes down a slide. Which two forces are acting on her?

Complete the sentence.

... of the Earth pulls her downwards.

(a)  

Minaz investigates how the type of surface affects friction.

The diagram shows her set-up.

Minaz will need ramps with ... types of surfaces.

• different

• bottom

• length

• time

Minaz investigates how the type of surface affects friction.

The diagram shows her set-up.

Some surfaces should be ... and other should be ... .

• rough

• top

• bottom

• smooth