Force and Motion

The force that pulls down is called

• gravity

• balance

• dynameter

A tool scientists use to measure force

• ruler

• spring scale

• stopwatch

Which device uses a magnet?

• a wheelbarrow

• doorbell

• lamp

What happens if you bring the north pole of a magnet near the south pole of another magnet?

• The magnets become stronger

• the magnets puch apart

• the magnets pull together

An electromagnet is a magnet that

• has only one pole

• can be turned on and off

• always pushes objects

Which is an example of back and forth motion?

• bowling bowl rolling down a lane

• pinwheel spinning around

• child moving on a swing

Which combination of charges will attract each other?

• positive and positive

• positive and negative

• negative and negative

Which event is caused by electric charges?

• earthquake

• lightning strike

• flood

What decreases the electric force between 2 charged objects?

• move them far apart

• bring them close together

• add more electric charges to them

When my clothes stick together it's because of static electricity. What causes them to stick together?

• the have balanced positive and negative charges

• they have imbalanced positive and negative charges

• they have only negative charges