Interactions through application of forces - Part 1

What is a force?

• a type of energy

• a push or pull

Which of the following is NOT an effect of a force?

• change the speed of a moving object

• change the direction of a moving object

• change the size and shape of an object

• change the mass of an object

What is the unit of force?

• volt

• ampere

• kilogram

• newton

A car travelled 100 km at a speed of 50 km/h. How long did the journey take?

• 0.5 h

• 2.0 h

• 20 h

• 5000 h

Which of the following is a contact force?

• gravity

• magnetism

• friction

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

• similar

• opposite

• parallel

• west

Rougher surfaces have ...

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

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

• True
• False

The amount of friction depends on the surface area in contact with the ground.

• True

• False

Which of the following is an example of friction that is harmful?

• Pencil marking on paper

• Engine parts wearing out

• Brakes on a bicycle

• Using an eraser to erase marks