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- 1. Multiple Choice
Gravity is the force that keeps us on the ground.
True
False
- 2. Multiple Choice
The force that the Earth acts on us is stronger than the force we act on the Earth.
True
False
- 3. Multiple Choice
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!
- 4. Multiple Choice
Gravity as a force was well-known among the ancient Greeks
True
False
- 5. Multiple Choice
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
- 6. Multiple Choice
The gravity force between the nucleus and the electrons in an atom is way too weak to keep the atom together.
True
False
- 7. Multiple Choice
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
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