AS Definitions

Question 1

Linear momentum

Answer 1

Product of mass and acceleration of the body

Question 2

Force

Answer 2

Rate of change of momentum

Question 3

Moment of a force

Answer 3

Product of force and its perpendicular distance from a point

Question 4

Torque of a couple

Answer 4

Product of one of the forces of a couple and the distance of separation of the forces

Question 5

Density

Answer 5

Mass per unit volume

Question 6

Pressure

Answer 6

Force per unit perpendicular area

Question 7

Mass

Answer 7

Quantity of matter in a body

Question 8

Centre of gravity

Answer 8

Point where all the weight of the body is take to act

Question 9

Distance

Answer 9

Change of position from a fixed point

Question 10

Displacement

Answer 10

Change of position from a fixed point in a straight line

Question 11

Speed

Answer 11

Distance covered per unit time in any direction

Question 12

Velocity

Answer 12

Change of displacement per unit time

Question 13

Acceleration

Answer 13

Rate of change of velocity

Question 14

Work done

Answer 14

The product of force and distance moved in the direction of the force

Question 15

Kinetic energy

Answer 15

Energy of body due to its motion

Question 16

Elastic potential energy

Answer 16

Energy stored in an object due to change of shape

Question 17

Power

Answer 17

Work done per unit time

Question 18

Stress

Answer 18

Force per unit cross-sectional area

Question 19

Strain

Answer 19

Extension unit original length

Question 20

Young Modulus

Answer 20

Stress per unit strain

Question 21

Diffraction

Answer 21

Spreading of waves into geometrical shaped when incident on a gap

Question 22

Wavelenth

Answer 22

Distance between two adjacent water fronts

Question 23

Wave displacement

Answer 23

Distance in a specified direction of particle from the equilibrium position

Question 24

Period

Answer 24

Time for one oscillation

Question 25

Amplitude

Answer 25

Maximum displacement of particles

Question 26

Coherence

Answer 26

Waves with constant phase difference

Question 27

Transverse waves

Answer 27

Wave with displacement of particles perpendicular to the direction of energy propagation

Question 28

Longitudinal waves

Answer 28

Wave with displacement of particles parallel to the direction of energy propagation

Question 29

Doppler effect

Answer 29

Change in observed frequency due to a source moving relative to an observer

Question 30

Antinode

Answer 30

Position in a stationary wave where the amplitude is maximum

Question 31

Potential difference (p.d)

Answer 31

Energy transferred from electrical to other forms per unit charge

Question 32

Electromotive force (e.m.f)

Answer 32

Energy transferred from other forms to electrical energy per unit charge

Question 33

Resistance

Answer 33

Potential difference per unit current

Question 34

Ohm

Answer 34

Volt per unit ampere

Question 35

Electric current

Answer 35

Charge per unit time

Question 36

Ampere

Answer 36

Coulomb per unit second

Question 37

Volt

Answer 37

Joule per coulomb