Gravity

Gravity is the force that keeps us on the ground.

• True

• False

The force that the Earth acts on us is stronger than the force we act on the Earth.

• True

• False

The Earth revolves around the Sun...

• In a perfectly circular orbit

• In a slightly elliptic orbit

• In an extremely elongated elliptic orbit

• It doesn't revolve around the Sun!

Gravity as a force was well-known among the ancient Greeks

• True

• False

if Ian and Sandra are standing close to each other and start to walk away from each other, the gravitational force between them will...

• Increase

• Decrease

• Stay the same

The gravity force between the nucleus and the electrons in an atom is way too weak to keep the atom together.

• True

• False

If the Sun would suddenly become a black hole...

• We would experience an abrupt change in the orbit of the Earth

• We would have no light and heat, but no significant gravitational effects

• The Earth would be invaded by extraterrestrial creatures