Understanding Gravity

Emerald Robinson explains gravity as the attraction between two masses, affecting everything from atoms to galaxies. The gravitational force depends on mass and distance. On Earth, gravity keeps us grounded due to its large mass. On the Moon, gravity is weaker, affecting weight. Gravity also influences tides, the atmosphere, and planetary orbits.

What is a basic definition of gravity?

• The speed at which objects fall

• The force that holds us down on Earth

• The energy that powers the sun

• The distance between two objects

How is gravity better defined?

• As the attraction between two masses

• As the energy of motion

• As the force of wind

• As the speed of light

What happens to gravitational force as mass increases?

• It remains the same

• It increases

• It becomes zero

• It decreases

How does distance affect gravitational force?

• Closer objects have weaker gravitational force

• Distance has no effect on gravitational force

• Farther objects have stronger gravitational force

• Closer objects have stronger gravitational force

Why does the Earth have a stronger gravitational pull on us than we have on it?

• Because we are made of different materials

• Because the Earth spins faster

• Because the Earth has a much larger mass

• Because we are closer to the sun

Why do astronauts weigh less on the Moon?

• Because the Moon has no atmosphere

• Because the Moon has a smaller mass than Earth

• Because the Moon spins faster

• Because the Moon is closer to the sun

What is the effect of gravity on weight?

• Weight decreases with less gravity

• Weight increases with less gravity

• Weight remains constant regardless of gravity

• Weight is independent of gravity

What role does gravity play in the Earth's atmosphere?

• It causes the atmosphere to disappear

• It causes the atmosphere to expand

• It holds the atmosphere in place

• It has no effect on the atmosphere

How does gravity affect the orbits of the moon and planets?

• It pushes them away from the sun

• It causes them to move in straight lines

• It has no effect on their orbits

• It keeps them in their orbits