Gravity and Circular motion

How does the gravitational force the Earth exerts on the sun compare to the gravitational force the sun exerts on the Earth?

• The gravitational force the sun exerts on the Earth is larger

• The gravitational force the Earth exerts on the sun is larger

• Their gravitational forces are equal

• There is not enough information

As two objects get closer together, what happens to the force of gravity between them?

• The force of gravity increases

• The force of gravity decreases

• The force of gravity stays the same, since their masses are constant

• Not enough information

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

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

Kepler's first law states that the orbits of the planets are oval in shape or 

• ellipses
• perfect circles

The path a planet travels around the sun is called its 

• orbit
• ellipse
• barycenter
• precession

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

• acceleration
• inertia
• mass
• frame of reference

Objects with greater _________ also have greater inertia.

• speed

• mass

• force

• friction

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

• rest
• a constant speed
• school
• inertia 

What kind(s) of objects have inertia?

• all objects with mass
• only objects at rest
• only objects in motion
• only objects whose motion is being changed