Definitions

Question 1

Potential difference

Answer 1

The work done per unit positive charge

Question 2

Current

Answer 2

The rate of flow of charge

Question 3

Ohm’s law

Answer 3

Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature

Question 4

Resistance

Answer 4

A materials opposition to the flow of electric current

Question 5

EMF

Answer 5

Total energy supplied per coulomb of charge by the cell

Question 6

Magnetic flux density (B)

Answer 6

A representation of the magnitude and direction of the magnetic field

Question 7

Magnetic flux linkage

Answer 7

The product of the number of turns on the coil and the flux through the coil

Question 8

Faradays law

Answer 8

The emf induced is directly proportional to the rate of change of magnetic flux (flux linkage)

Question 9

Lens’s law

Answer 9

The induced current flows in a direction so as to set up a magnetic field to oppose a change in magnetic flux

Question 10

Resultant vector

Answer 10

The single vector that has the same effect as all the original vectors acting together

Question 11

Distance

Answer 11

The length of path travelled

Question 12

Displacement

Answer 12

A change in position

Question 13

Speed

Answer 13

The rate of change of distance

Question 14

Velocity

Answer 14

The rate of change of displacement

Question 15

Acceleration

Answer 15

The rate of change in velocity

Question 16

Weight

Answer 16

The gravitational force the earth exerts on any object on or near its surface

Question 17

Normal force

Answer 17

The perpendicular force exerted by a surface on any object in contact with it

Question 18

Frictional force

Answer 18

The force that opposes the motion of the object and acts parallel to the surface with which the object is in contact

Question 19

Newton’s first law

Answer 19

An object continues in a state of rest or uniform velocity unless it is acted upon by a net or resultant force

Question 20

Newton’s second law

Answer 20

When a net force, Fnet, is applied to an object of mass, m, it accelerates in the direction of the net force. The acceleration, a, is directly proportional to the net force and inversely proportional to the mass

Question 21

Newton’s third law

Answer 21

When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A

Question 22

Newton’s law of universal gravitation

Answer 22

Every particle with mass in the universe attracts every other particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres

Question 23

Gravitational field

Answer 23

The force acting per unit mass

Question 24

Coulomb’s law

Answer 24

Two point charges in free space or air exert forces on each other. The force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them

Question 25

Electric field

Answer 25

A region of space in which an electric charge experiences a force. The direction of the electric field at a point is the direction that a positive charge would move if placed at that point

Question 26

The magnitude of the electric field at a point

Answer 26

Force per unit positive charge. E = F/q where E and F are vectors

Question 27

Vector

Answer 27

Physical quantity that has both magnitude and direction

Question 28

Scalar

Answer 28

Physical quantity that has magnitude only

Question 29

Inertia

Answer 29

Property of an object that causes it to resist a change in its state of rest or uniform motion

Question 30

Power

Answer 30

Rate at which work is done

Question 31

Gravitational field and acceleration due to gravity

Answer 31

ARE EQUIVALENT!!!!!!