Gravity
What is gravity and why don't we float away?
An exploration of gravity, explaining why it is a fundamental force of attraction, how mass and distance influence it, and why it keeps us grounded on Earth.
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Foundations of Gravity
1. What primary factors determine the strength of the gravitational force between two objects?
- A. Temperature and color
- B. Mass and distance
- C. Air pressure and shape
- D. Speed and volume
2. Why would you weigh less on the Moon than you do on Earth?
- A. The Moon has less mass than Earth
- B. The Moon is colder than Earth
- C. The Moon has no atmosphere
- D. There is no gravity on the Moon
3. Which of the following is true regarding gravity and the atmosphere?
- A. Gravity pushes air away from the planet
- B. Air pressure creates gravity
- C. Earth's gravity holds the atmosphere against the surface
- D. Gravity cannot exist in the same space as air
4. What happens to the strength of gravity as you move further away from an object?
- A. It increases
- B. It stays exactly the same
- C. It disappears immediately
- D. It gets weaker
Analyzing Gravity Concepts
1. Why do astronauts appear to float while orbiting the Earth in space?
- A. They have entered an area where gravity does not exist
- B. They are in a constant state of freefall while orbiting
- C. The lack of oxygen prevents gravity from working
- D. Their mass becomes zero in the vacuum of space
2. If you are sitting in a chair, which statement about gravity is correct?
- A. Gravity is no longer acting on you because you are not falling
- B. Gravity only acts on you when you move
- C. Gravity is constantly pulling you toward the center of the Earth
- D. Only objects with more mass than you are affected by gravity
3. How does gravity explain the movement of planets and moons?
- A. Gravity creates the light that pushes planets in orbits
- B. Gravity acts as the force that keeps objects in stable orbits
- C. Gravity causes planets to collide with stars
- D. Gravity is only strong enough to move tiny particles
4. Why is the gravitational pull of a human being not noticeable to those around them?
- A. Humans do not have mass
- B. Gravity only works for planets and stars
- C. Human gravitational pull is incredibly weak compared to Earth's
- D. Gravity only attracts objects in a air-filled environment
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