Chapter 3 F4

Question 1

Newton’s Universal Law of Gravitation

Answer 1

Gravitational force is directly proportional to the product of masses of two bodies and inversely proportional to the square of the distance between the centers of two bodies.

Question 2

Gravitational force

Answer 2

Universal force acting between two bodies in the universe

Question 3

Kepler’s First Law

Answer 3

All planets move in elliptical orbits with the Sun at one focus.

Question 4

Kepler’s Second Law

Answer 4

A line that connects a planet to the Sun sweeps out equal areas in equal times.

Question 5

Kepler’s Third Law

Answer 5

The square of the orbital period of any planet is directly proportional to the cube of the radius of its orbit.

Question 6

Escape velocity

Answer 6

he minimum velocity needed by an object on the surface of the Earth to overcome gravitational force and escape to outer space.

Question 7

Centripetal force

Answer 7

force acting on an object in circular motion that acts in direction towards the centre of the circle.