L5: Gravity

What is gravity?

• A force of attraction between two objects

• A type of light

• A sound wave

• A type of food

Which objects exert a gravitational force?

• Only stars

• Only planets

• All objects with mass

• Only the moon

What keeps the moon in orbit around Earth?

• Earth's gravity

• The sun's light

• The moon's own light

• The wind

What happens to the force of gravity when the distance between two objects increases?

• It stays the same

• It increases

• It decreases

• It disappears

Why doesn't the moon fall to Earth's surface?

• Because it is too heavy

• Because it is too far away

• Because it is too small

• Because it is too close

How far is the moon from Earth?

• 100,000 miles

• 238,900 miles

• 500,000 miles

• 1,000,000 miles

What keeps Earth in orbit around the sun?

• The sun's gravity

• The moon's gravity

• Earth's gravity

• The stars' gravity

Why doesn't Earth crash into the sun?

• Because the sun is too small

• Because Earth is at the perfect distance

• Because the sun is too far away

• Because Earth is too big

What is the main factor that affects the strength of gravitational force between two objects?

• Color

• Distance

• Shape

• Temperature

Which of the following is a very large object whose gravitational force we can notice?

• A book

• A star

• A pencil

• A chair