Turning on a pivot

Which of these is the best way to measure a force?

• Using a force meter

• Using a ruler

• Using a thermometer

Forces can be:

• Pushes only

• Pulls only

• Pushes and pulls

What is the unit of force called?

• The newton, n

• The newton, N

• The neutron, N

What can we say about the forces on an object that is not moving?

• There must only be one force acting on it

• The forces must be balanced

• It must be very heavy

The arrows in this diagram represent the sizes of forces acting on a stationary tennis ball. What will happen to the tennis ball?

• It will stay still

• It will start to move upwards

• It will start to move downwards

What happens to the air resistance on a car as the car goes faster?

• It decreases

• It stays the same

• It increases

One way to increase the turning force on a spanner is to:

• Use a shorter spanner

• Use a longer pivot

• Use a longer spanner

What store of energy does friction always produce?

• Heat

• Light

• Gravitational potential

What is a moment?

• A lever

• The turning effect of a force

• The turning effect of a ballerina

What is the unit of a moment?

• Newtons (N)

• Newtons per metre (N/m)

• Newton-metres (Nm)