Newtonian mechanics

Question 1

1 radian (rad)

Answer 1

is the angle subtended at the centre of a circle by an arc of length equal to the radius of the circle.

Question 2

Angular displacement

Answer 2

is the change in angle (measured in radians) of a body as it rotates round a circle.

Question 3

Angular speed

Answer 3

is the change in angular displacement per unit time.

Question 4

Newton’s law of gravitation

Answer 4

states that any two point masses attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of their separation.

Question 5

Gravitational field strength

Answer 5

at a point is defined as the gravitational force per unit mass at that point.

Question 6

Gravitational potential

Answer 6

at a point is the work done in bringing unit mass from infinity to that point.