Forces, Gravity and Motions

What is the definition of force?

• A change in position compared to a reference point

• A push or pull that can change an object's motion

• The amount of matter in an object

• The force of gravity on an object

What is the unit of force?

• Kilogram (kg)

• Meter (m)

• Newton (N)

• Joule (J)

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What happens to gravity when mass increases?

• It becomes weaker

• It stays the same

• It becomes stronger

• It disappears

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What is inertia?

• The force of attraction between any two masses

• An object's resistance to changes in its motion

• A change in an object's speed or direction

• The total force acting on an object

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What do balanced forces do?

• Cause motion or change in direction

• Cancel each other out—no motion change

• Increase the speed of an object

• Decrease the mass of an object

What happens when forces are balanced?

• Motion begins

• No motion/change

• Speeds up

• Changes direction

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What is an example of unbalanced forces?

• Tug of war with equal teams

• A car parked on a hill

• One team pulling harder in tug of war

• A book resting on a table

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What does friction do?

• Speeds things up

• Slows things down

• Changes direction

• Stops motion completely

What is air resistance?

• A type of balanced force

• A special kind of friction

• A force that speeds up objects

• A type of gravitational force

According to Newton's first law, what is inertia?

• The tendency to speed up

• The tendency to slow down

• The tendency to stay at rest or in motion unless a force changes it

• The tendency to change direction