Gravity and Inertia

There is a gravitational force between you and your desk. This gravitational force is very small because _____.

• the masses are tiny compared to Earth's mass

• it doesn't need to be large

• the distance between the objects is small

• it is a noncontact force

If the mass of one of two spheres increases, how does it affect the gravity between the two spheres?

• the gravity increases

• the gravity decreases

• the gravity fluctuates

• the gravity is not affected

Gravitational force differs based on two things.

It increases with increasing ___________.

It decreases with increasing __________ .

• mass

  distance

• distance

  mass

• orbit

  displacement

• displacement

  orbit

Two factors effecting the magnitude of the force of gravity between 2 objects are...

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass

What is the tendency of an object to resist a change in motion?

• coffee
• motion
• inertia
• gravity

Why do the planets in our solar system orbit the sun?

• because the sun is the brightest object

• because the sun was there first

• because the sun has the most mass

• because nothing can orbit planets

Because of inertia, a moving object will keep ________.

• at rest
• moving
• in one spot
• inertia 

Because of inertia, a resting object will remain at ________.

• rest
• a constant speed
• school
• inertia 

the tendency of an object to resist a change in its motion

• acceleration
• inertia
• mass
• frame of reference

Gravity is based on an object's

• mass

• size

• roundness

• brightness