Motion In A Circle And Orbits

Question 1

What is Angular displacement

Answer 1

• it is the angle through which an object turns, usually measured in radians

Question 2

Arc length, s, formula

Answer 2

s = r0-

Question 3

What is angular velocity, w

Answer 3

• defined as the rate of change of angular displacement

Question 4

What is Centrepetal force

Answer 4

• is the resultant of one or more real forces, not an additional force
• F_c = ma_c = mv²/r = mrw²

Question 5

What is the field of a force

Answer 5

• a region of space where a body experiences a force

Question 6

What is a gravitational field

Answer 6

• a region of space where a amass experiences a force

Question 7

What is gravitational field strength

Answer 7

• gravitational field strength at a point is the gravitational force exerted per unit mass placed at that point

Question 8

What is newton’s Law of Gravitation

Answer 8

• 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 9

What is a geostationary orbit

Answer 9

• refers to a circular orbit around the Earth in which a satellite 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 rotation of the Earth