Unit 13 Test - Gravity -

If the mass of Earth increased, with no change in radius, your weight would _____.

• stay the same
• decrease
• increase

A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. The force that is greater is (a)  

• The force on B
• The force on A
• Both forces are the same

Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the force between them (a)   .

• remains the same
• increases
• decreases

The reason the moon does not fall into Earth is because _____.

• Earth's gravitational field at the moon is weak
• the moon has a large amount of tangential velocity

• the moon has less mass than Earth

If the radius of Earth decreased, with no change in mass, your weight would (a)   .

• decrease
• increase
• not change

The gravitational field strength at the center of Earth is (a)   .

• zero
• the same as on the surface
• Twice the surface value

If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh _____.

• zero
• more
• less

In an elevator that is in free fall, you would weigh (a)   compared to your ordinary weight.

• zero
• more
• less

Ocean tides occur mainly because (a)   .

• of the gravitational pull of the sun on oceans
• as Earth rotates it leaves the oceans behind
• of the gravitational pull of the moon on oceans.

The effect of the sun's pull on Earth's oceans is much less visible than that of the moon's pull because _____.

• the sun is so far away
• Earth is spinning so fast
• Earth is orbiting so fast