Gravity & Free Fall

The video tutorial explores the concept of gravity, starting with a simple example of a thrown ball and the forces acting on it. It delves into the universal role of gravity, explaining how it affects celestial bodies and orbits. The tutorial covers Newton's law of gravitation, highlighting the relationship between mass, distance, and gravitational force. It also explains the concept of weightlessness in space, using the space station as an example. Finally, the video introduces Einstein's theory of general relativity, which describes gravity as a distortion in space-time.

What force acts on a ball after it is thrown upwards?

• No force acts on it

• The downward force of gravity

• The upward force from your hand

• Both upward and downward forces

Who first proposed the universal law of gravitation?

• Albert Einstein

• Nikola Tesla

• Galileo Galilei

• Isaac Newton

What happens to the gravitational force if the distance between two objects is doubled?

• It is reduced to one-fourth

• It quadruples

• It doubles

• It remains the same

Why do objects in the space station appear weightless?

• The space station is too far from Earth

• They are in constant freefall

• Gravity is weaker in space

• There is no gravity in space

What keeps the space station in orbit around Earth?

• The lack of gravity

• The gravitational force between Earth and the space station

• The space station's engines

• The Earth's magnetic field

On Earth, why do we perceive gravity as constant?

• Both A and B

• Because the distance to the center of the Earth is negligible

• Because the Earth's mass is constant

• Because gravity doesn't change

What did Einstein propose in his theory of general relativity?

• Gravity does not exist

• Gravity is stronger over long distances

• Massive objects cause a distortion in space-time

• Gravity is a force between masses