Definitions

Question 1

Moment of inertia

Answer 1

a measure of an objects resistance to angular acceleration about a given axis.

Question 2

Gravitational field

Answer 2

The region in space around an object where it exerts a gravitational force on an object

Question 3

Conservative field

Answer 3

Work done in moving object between two points in field is independent of path taken

Question 4

Gravitational field strength

Answer 4

The gravitational force acting on a unit mass at that point in the field

Question 5

Gravitational potential (V)

Answer 5

The work done by external forces in moving a unit mass from infinity to that point

Question 6

Escape velocity

Answer 6

The lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object

Question 7

Einstein’s equivalence principle

Answer 7

It is impossible to tell the difference between a uniform gravitational field and a frame of reference that has a constant acceleration

Question 8

Electric field strength

Answer 8

Force acting per unit positive charge in an electric field

Question 9

Electric potential

Answer 9

The work done by external forces in bringing a unit positive charge (1C) from infinity to that point

Question 10

Conservation of angular momentum

Answer 10

Angular momentum of a rotating body is conserved unless acted upon by an external torque