6. Motion in a Circle and Orbits

Question 1

What is Angular Displacement

Answer 1

It is the angle through which an object turns

Question 2

What is Angular Velocity

Answer 2

It is defined as the rate of change of angular displacement

Question 3

What is a Field of Force

Answer 3

It is a region of space where a body experiences a force

Question 4

What is a Gravitional field

Answer 4

It is a region of space where a mass experiences a force. The direction of the field is the direction of the force on the mass

Question 5

What is Newton’s Law of Gravitation

Answer 5

It states that the mutual force of attraction between any two point masses is proportional to the product of the masses and inversely proportional to the square of their separation

Question 6

What is Weightlessness

Answer 6

It is the situation when a person experiences free fall and has zero contact force on him

Question 7

What is a Geostationary Orbit

Answer 7

It refers to a circular orbit around the Earth in which a sattelite would appear stationary to an observer on the Earth’s surface because it revolves around the Earth with the same period and in the same direction as the rotaion of the Earth