Tema 9

Forces cause

______ is a force that pulls everything towards the centre of

the Earth.

To regulate the temperature in our homes, we use

• Thermostats

• Water flow regulators

• appliances

If a ball is rolling on the grass, it will slow down and stop because of

• speed

• Friction

• Water resistance

Pedal on a bike are an example of

• axles

• Levers

• belts

The componet of a machine that produces movement is the

• motor

• structure

• operating part

When an object is moving downwards, gravity causes it to

_______ in speed until the object hits the ground.

When an object is moving upwards, gravity slows it down

until it _______ moving upwards.

You throw a ball up in the air. As it travels up, gravity

• Cause the ball to speed up

• Cause the ball to slow down

• Does not affect the ball

Gears are

• rods that suppot rotating wheels

• leverthat turn in circles

• wheel with teeth