Gravity & Inertia

To change the motion of an object, inertia must be overcome by a __________ acting on the object.

• temperature
• speed
• force
• velocity

A force which tries to pull two objects towards each other is

• gravity

• inertia

• mass

• speed

Order these items from lightest to heaviest.

• bike, lightbulb, glass of milk
• lightbulb, bike, glass of milk
• lightbulb, glass of milk, bike
• glass of milk, lightbulb, bike

Because of inertia, a moving object will keep ________.

• at rest
• moving
• in one spot
• inertia 

Objects with less mass are...

• easier to speed up or slow down.

• harder to speed up or slow down.

Objects with more mass are..

• harder to speed up or slow down

• easier to speed up or slow down

Which model has greater gravitational attraction (if any)

• Model A
• Model B
• Both Model A and Model B (same gravity)

Which system has the greater gravitational attraction between the two objects (if any)?

• System A
• System B
• Same gravitational attraction fro System A and System B

Which objects have a STRONG force of gravity?

• Objects with GREATER mass, like elephants
• Objects with LESS mass, like mice

What would happen to the planets in the solar system if the sun’s gravitational force were to suddenly disappear?

• They will stop moving and become static.
• They will stop spinning.
• They will fly away in straight lines.
• They will start moving toward the Sun