Forces

What is a force?

• the PUSH or PULL on an object

• The objects HITTING one another

• The MOTION an object creates

• Going REALLY FAST

The wind blows a sailboat across a lake. If the wind began to blow harder, how much time would it take the boat to cross the pond?

• It would take more time

• There is not enough information to know

• It would take less time

• It would take the same

What unit do scientists use to measure force?

• Newton

• Grams

• Metres

• Metres per second

Which force always pulls downward on objects?

• Gravity

• Air Resistance

• Downward Force

• Upward Force

Heavier objects require less force to move.

• true

• false

An unbalanced force will cause an object to speed up, slow down or change direction.

• true

• false

If these teams are pulling with the same amount of force what will happen?

• The boy in green will win

• The boy in yellow will win

• They will not move at all

• Both will fall down

Vashti has a balloon filled with air. When she places it on the surface of a pond, the balloon floats. What would happen to the balloon if Vashti filled the balloon with sand and then placed it on the pond’s surface?

• The balloon would sink.

• The balloon would burst

• The balloon would float in the air

• The balloon would float in the water

Which is the upward force on an swimmer that balances the downward force of gravity and keeps the swimmer from sinking?

• Upthrust

• density

• gravity

• pressure

Which of the following is true of the buoyant force?

• It acts in the downward direction.

• It acts with the force of gravity.

• It acts in the upward direction.

• It makes an object feel heavier.