Gravitational vs. Electrostatic Forces

Which is needed to determine the amount of gravitational force between two objects?

• distance and mass

• weight and time

• area and weight

The gravitational force exerted by an object depends on its

• volume

• mass

• weight

The force of gravity is related to the masses of objects attracting each other. Which planet has the greatest mass?

• Mercury 3.7

• Jupiter 23.1

• Neptune 11.0

What is gravitational force?

• It makes objects at rest start moving.
• It makes objects that are moving stop.
• The force of attraction between two objects.
• It pulls you into space.

As the product of two objects' masses increases, the pull of gravity

• Increases
• Decreases
• Stays the same

If a feather and a hammer are dropped at the same time on the moon, where there is no atmosphere, which one will hit the ground first?

• Neither, there is no gravity on the moon.
• hammer because it has more mass
• feather because it has less mass
• both will hit at the same time

The SI units of force are measured in 

• Grams
• Newtons
• Pounds
• Kilograms

Gravity on moon is less than the gravity on earth because

• a. moon's mass is less

• b. moon's mass is more

• c. moon's mass is equal to Earth

• d. moon has no mass

Complete the following statement: The farther away two planets are the _______ the gravitational force between them.

• more
• same
• dosen't matter
• less

What is happening in the picture?

• gravity

• repulsion

• pushing

• attraction