Gravitation

Question 1

Newton’s law of gravitation

Answer 1

The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them.

Question 2

Gravitational field strength (g)

Answer 2

Gravitational force per unit mass on a point mass

Question 3

Gravitational potential energy

Answer 3

Work done in moving a mass from infinity to a point in space

Question 4

Gravitational Potential (V)

Answer 4

Work done per unit mass in moving a mass from infinity to a point in space

Question 5

Equipotential Surface

Answer 5

Every point on a surface that has the same potential

Question 6

Escape speed

Answer 6

minimum speed required of a rocket needed to escape the gravitational pull of a planet

Question 7

Weightlessness in free-fall

Answer 7

Sense of weightlessness because there is no normal reaction acting on the person due to gravity

Question 8

Weightlessness in orbital motion

Answer 8

Sense of weightlessness due to the spacecraft and objects been in freefall together as it orbits the Earth.

Question 9

Weightlessness in deep space

Answer 9

Due to the minimal pull of gravity far from any massive object