# Physics Definitions

0.0 / 5

HideShow resource information

- Created by: Alibunn
- Created on: 04-03-14 10:16

Electric Charge

An electric charge occurs when there are fewer or more electrons than protons.

1 of 53

Current

Is caused by the movement of electrons

2 of 53

A.C

Alternating Current - electrons constantly change direction of motion

3 of 53

D.C

Direct Current - Electrons move in one direction

4 of 53

Potential Difference

Number of Joules of energy given to each coulomb of charge passing through the cell

5 of 53

Series Circuit

Has only one path round it

6 of 53

Parallel Circuit

Has more than one path round the circuit

7 of 53

Thermistor

Resistor whose resistance changes with changes in temperature

8 of 53

LDR

Resistor whose resistance changes with changes in light level

9 of 53

Power

Number of Joules of energy used per second

10 of 53

Specific Heat Capacity

The numebr of Joules of energy required to raise the temperature of 1kg of a material by 1 degree Celsius

11 of 53

Temperature

A measure of the mean kinetic energy of the particles

12 of 53

Heat

Energy of a substance

13 of 53

Conservation of Energy

Energy cannot be created or destroyed only transormed from one type to another.

14 of 53

Pressure

Force per unit area

15 of 53

Absolute zero

Temperature of 0K or -273 degrees Celsius - particles have no kinetic energy

16 of 53

Average speed

distance divided by time

17 of 53

Average velocity

displacement divided by time

18 of 53

Vector

A quantity that needs magnitude and direction to be described correctly

19 of 53

Scalar

A quantity that only needs magnitude to be described correctly

20 of 53

Distance

The total length of the path taken

21 of 53

Displacement

The length between start and finish points

22 of 53

Acceleration

Change in velocity per second

23 of 53

Balanced Force

Equal Forces in opposite directions

24 of 53

Friction

Two surfaces rubbing together

25 of 53

Streamlining

Changing the shape of an object to reduce frictional forces

26 of 53

Work

Energy used to move an object over a distance

27 of 53

Weight

Force downwards caused by the gravitational field strength

28 of 53

Mass

A measure of all the particles that make an object up

29 of 53

Gravitational Field Strength

Force per unit mass

30 of 53

Newtons 3rd Law

For every action force there is an equal and opposite reaction force

31 of 53

Terminal Velocity

Weight down = Air resistance upwards resulting in a constant velocity

32 of 53

Latent Heat of Fusions

Number of Joules of heat energy required to change 1kg of a solid into 1kg of a liquid with no temperature change

33 of 53

Latent Heat of Vapourisation

Number of Joules of heat energy required to change 1kg of a liquid into 1kg of a gas with no change in temperature

34 of 53

Light Year

The distance that light can travel in a year

35 of 53

Observable Universe

Furthest point that we can see or detect

36 of 53

Longitudinal Wave

A wave that vibrates along the direction of travel

37 of 53

Transverse Wave

A wave that vibrates at 90 degrees to the direction of travel

38 of 53

Wavelength

Distance from a point on one wave to the same point on the next

39 of 53

Frequency

Number of waves per second

40 of 53

Amplitude

Distance from the centre of a wave to the crest or trough

41 of 53

Period of a wave

The time it takes one wave to pass a point

42 of 53

Diffraction

Bending of waves round an obstacle

43 of 53

Refraction

Chane in speed of light as it changes material

44 of 53

Normal

Imaginary line at 90 degrees to a surface

45 of 53

Ionisation

When an atom gains or loses an electron to become charged

46 of 53

Background Radiation

Radiation all around us - either natural or man-made

47 of 53

Absorbed Dose

Energy absorbed per unit mass

48 of 53

Equivalent Dose

Is a way to take into account the type of radiation and the absorbed dose

49 of 53

Activity

Number of decays per second

50 of 53

Half Life

Length of time it takes th activity of a source to reduce to a half of its original value.

51 of 53

Fission

A large mass nucleus splits into two or more nuclei of smaller mass and neutrons are released

52 of 53

Fusion

Two nuclei of smaller mass combine to form a nucleus of larger mass

53 of 53

## Other cards in this set

### Card 2

#### Front

Is caused by the movement of electrons

#### Back

Current

### Card 3

#### Front

Alternating Current - electrons constantly change direction of motion

#### Back

### Card 4

#### Front

Direct Current - Electrons move in one direction

#### Back

### Card 5

#### Front

Number of Joules of energy given to each coulomb of charge passing through the cell

#### Back

## Similar Physics resources:

2.0 / 5

0.0 / 5

0.0 / 5

0.0 / 5

4.0 / 5

0.0 / 5

0.0 / 5

4.0 / 5

0.0 / 5

0.0 / 5

## Comments

No comments have yet been made