Review - Unit 1: Balancing Forces

A toy car is sitting still on the floor. Which of the following investigations would help you understand changing forces on the car?

• Describe what direction the car is going.

• Observe that the car is not moving.

• Push on the car and see how far it rolls.

This picture shows ________.

• balanced forces

• unbalanced forces

• non-touching forces

• magnetic forces

If you want to move something heavy, you have to _____.

• use more force than gravity

• use as much force as gravity

• use less force than gravity

Which of the following investigations has a touching force?

• Joe pushes the toy car across the floor to see how far it goes.

• Joe uses a magnet to move the toy car across the floor.

• Joe stands on a ladder and drops the toy car to the floor.

What is going to happen next?

• The little girl will jump off the swing.

• The little girl will swing backwards and stop.

• The little girl will swing backwards and then forwards again.

• Nothing, she will stay there.

Will these magnets repel?

• Yes, because they are opposite poles.

• Yes, because they are the same poles.

• No, because they are opposite poles.

• No, because they are the same poles.

If you wanted to learn about non-touching forces, which investigation would be best to use?

• Using a magnet to make a paperclip float.

• Finding out what magnets are attracted to.

• Reading about magnets.

Ben plans an investigation about gravity, using a bowling ball and a feather. He knows that gravity pulls all objects toward the Earth. Which question can Ben answer by carrying out his investigation?

• Which object falls faster?

• Which object is heavier?

• Why is the bowling ball round?

• What kind of feather is it?

This picture shows ___________.

• balanced forces

• unbalanced forces

• non-touching forces

• magnetic forces