# Physics definitions

0.0 / 5

HideShow resource information

- Created by: RealYorkshireman
- Created on: 09-04-15 12:17

Scalar

A quantity with just magnitude

1 of 83

Vector

A quantity with magnitude and direction

2 of 83

Displacement

Distance in a particular direction

3 of 83

Velocity

The rate of change of displacement

4 of 83

Acceleration

The rate of change of velocity

5 of 83

Instantaneous speed

The speed at a given time ( can be seen as the gradient on a distance time graph)

6 of 83

Average speed

Ratio of distance to time

7 of 83

Newton

The force required to give a mass of 1kg the acceleration of 1ms^-2

8 of 83

Terminal velocity

The maximum speed of an object as a result of an equal drag to driving force ( usually the force of gravity)

9 of 83

Center of gravity

The point through which the weight of an object can be considered to act

10 of 83

Couple

a pair of equal, parallel forces that produce a rotation

11 of 83

Torque

One of the forces x the perpendicular distance between the forces

12 of 83

Moment

Force x perpendicular distance between the force and the pivot/given point

13 of 83

Thinking distance

The distance a vehicle travels from the instance the driver sees the need to apply the brakes and the instance that the brakes are applied

14 of 83

Braking DIstance

The distance that the vehicle travels between the instance that the brakes are applied to the instance that the vehicle comes to a complete stop

15 of 83

Stopping Distance

The sum of the thinking distance and the braking distance

16 of 83

work done

Force multiplied by the distance in which the force is acting

17 of 83

Joule

The work done when a force of 1N moves its point of application 1m in the direction of the force

18 of 83

Conservation of Energy

Energy can not be created or destroyed but may be transferred from one form to another

19 of 83

Power

The rate of doing work

20 of 83

Watt

1 joule per second`

21 of 83

Tensile force

Stretching force; two equal and opposite forces are required to put an object under tension

22 of 83

Compressive force

Squeezing/Squashing ; two equal and opposite forces acting towards the object.

23 of 83

Extension

Change in length from the original length

24 of 83

Elastic limit

The point in which an extended or deformed object will no longer return to its original shape

25 of 83

Stress

Force per unit Cross sectional area

26 of 83

Strain

Extension per unit length

27 of 83

Young's modulus

Ratio of stress to strain ( Stress/Strain)

28 of 83

Ultimate Tensile Strength

That maximum stress an object can endure before fracture

29 of 83

Elastic deformation

The deformation of an object which will return to its original shape when the force is removed

30 of 83

Plastic deformation

The deformation of an object that has resulted in the permanent deformation when the force is removed

31 of 83

Weight

W = mass x acceleration due to gravity (g)

32 of 83

Electric current

The net flow of charged particles per unit time through a point

33 of 83

Conventional current

A model used to describe the movement of charged particles in a circuit

34 of 83

Electron flow

The movement of electrons around a circuit. Negative to positive

35 of 83

Electric charge

(C), 1 coulomb being the total charge supplied by a current of 1 ampere in a time of 1 second

36 of 83

elementary charge

The charge on one electron is 1.6x10^-19

37 of 83

Kirchoff's 1st law

The sum of the current flowing into a junction is equal to the sum of the current flowing out of the junction as charge is conserved

38 of 83

Mean drift velocity

The average speed of charged particles along the length of a conductor

39 of 83

Conductor

A material with a high number density of conduction electrons and therefore a low resistance

40 of 83

Semi conductor

a material with a low number density of conduction electrons and therefore a high resistance

41 of 83

Insulator

A material with a number density of conduction electrons nearing 0 and therefore a very high resistance

42 of 83

Electromotive force (emf)

Energy transferred per unit charge when a type of energy is being converted to electrical energy.

43 of 83

Potential difference (pd)

Energy transferred per unit charge when electrical energy is converted into another form of energy

44 of 83

Power

Work done per unit time

45 of 83

Resistance

Potential difference across a component per unit current

46 of 83

Ohm's law

the current that flows through a component is directly proportional to the potential difference across it providing physical properties such as temperature remain constant

47 of 83

Kirchoff's 2nd

The sum of the emfs around a loop is equal to the sum of the pds around the same loop - conservation of charge

48 of 83

Internal resistance

The resistance of an emf source eg; a cell

49 of 83

Potential divider circuit

A type of circuit containing two components designed to divide the pd in proportion to the resistances of the components

50 of 83

Progressive waves

move through a material transferring energy from one position to another

51 of 83

longitudinal waves

motion of the oscillation of particles is parallel to the direction of the propagation

52 of 83

Transverse waves

Motion of the oscillations of particles is perpendicular to the direction of the propagation

53 of 83

Amplitude

Maximum displacement from the point of equilibrium

54 of 83

Wavelength

The smallest distance between waves - peak to peak / trough to trough

55 of 83

Period

The time taken to complete one full oscillation ( peak to peak)

56 of 83

frequency

The number of oscillations passing per second ( f=1/T)

57 of 83

Phase difference

the proportion of a cycle by which the two waves are "out of sync"

58 of 83

Wave speed

Speed with which energy is transmitted by a wave v=fλ

59 of 83

Intensity

Rate of energy transfer per unit area (at right angles to wave velocity)

60 of 83

Reflection

When waves rebound from a barrier resulting in a change of direction

61 of 83

Refraction

When waves change direction when they travel from one medium to another due to difference in wave speed in each medium

62 of 83

Diffraction

When a wave spreads out after passing around and obstacle or through a gap

63 of 83

Electromagnetic waves

A self-propagating transverse wave that doesnt require a medium to travel through

64 of 83

Polarity

A wave property that distinguishes between transverse and longitudinal waves

65 of 83

Plane polarised

A transverse wave that only oscillates in one direction

66 of 83

Principle of Superposition

the ability for a wave to pass through each other and then continue unaffected

67 of 83

Interference

The superposition of 2 or more coherent waves resulting a new wave/

68 of 83

Coherence

two waves with a constant phase relationshop over a significant period of time

69 of 83

Path difference

The proportion of the wavelength that the 2 waves are 'out of sync'

70 of 83

Constructive interference

When two waves superimpose to create an increased amplitude

71 of 83

Destructing interference

When two waves superimpose to create a reduced amplitude

72 of 83

Stationary waves

A wave pattern produced when two progressive waves of the same frequency travelling in opposite directions superimpose, energy is stored rather than transferred from on place to another

73 of 83

Antinode

Point of maximum amplitude along a stationary wave

74 of 83

Node

A point that has 0 amplitude along a stationary wave as a result of destructive interference

75 of 83

Fundamental mode of vibration

The simplest stationary wave that can be set up where the length of the string is have the wavelength

76 of 83

Fundamental frequency

Lowest frequency in harmonics series where a stationary wave forms

77 of 83

harmonics

Whole number multiples of the fundamental frequency of a stationary wave

78 of 83

Photon

A quantum of energy of EM radiation

79 of 83

ElectronVolt

The energy change of an electron when it moves through a potential difference of 1 volt

80 of 83

Work function φ

minimum energy required by a single electron to escape the metal surface

81 of 83

Threshold frequency

The minimum frequency required to release electrons from the surface of a metal

82 of 83

De Broglie equation

λ=h/mv - an equation expressing wavelength as a ratio of planck's constant and the particles momentum

83 of 83

## Other cards in this set

### Card 2

#### Front

A quantity with magnitude and direction

#### Back

Vector

### Card 3

#### Front

Distance in a particular direction

#### Back

### Card 4

#### Front

The rate of change of displacement

#### Back

### Card 5

#### Front

The rate of change of velocity

#### Back

## Similar Physics resources:

0.0 / 5

3.0 / 5

4.0 / 5

0.0 / 5

0.0 / 5

0.0 / 5

0.0 / 5

0.0 / 5

## Comments

No comments have yet been made