# Definitions - G484 and G485

5.0 / 5

Teacher recommended

HideShow resource information

Newton's First Law

A body at rest or in uniform motion will remain at rest or in uniform motion unless a resultant force acts

1 of 51

Newton's Second Law

The rate of change of momentum is directly proportional and acts in the same direction as the resultant force acting upon it

2 of 51

Newton's Third Law

If body A exerts a force on body B, then body B will exert an equal and opposite force on body A

3 of 51

Linear Momentum

The mass of an object multiplied by its velocity

4 of 51

Newton

The force that gives a mass of one kilogram an acceleration of one metre per second squared

5 of 51

Principle of conservation of momentum

In any direction, with the absence of external forces, the total momentum of a system remains constant

6 of 51

Impulse

The change in momentum of a body

7 of 51

Perfectly elastic collision

One where no momentum or kinetic energy is lost

8 of 51

Inelastic collision

Momentum is conserved but kinetic energy is not

9 of 51

Radian

The angle subtended at the centre of a circle by an arc of length equal to the circle's radius

10 of 51

Period

The time taken to complete one revolution

11 of 51

Centripetal acceleration

The acceleration of a body moving in a circle with a constant speed

12 of 51

Field

Region in which a force opperates

13 of 51

Gravitational field strength

Force acting per unit mass at that point

14 of 51

Gravitational force

Directly proportional to the product of their masses and inversely proportional to the square of the distance between them

15 of 51

Kepler's Third Law

The period of a planet squared equals the mean radius of orbit cubed

16 of 51

Displacement

The distance an object has moved from its mean (or rest) position

17 of 51

Amplitude

The maximum dispacement

18 of 51

Frequency

The number of oscillations per unit time at any point

19 of 51

Period (SHM)

Time for one complete pattern of oscillations to take place at any point

20 of 51

Damping

Deliberately reducing the amplitude of an oscillaiton

21 of 51

Resonance

The build up of a large amplitude oscillation when the frequencies of vibrating objects match

22 of 51

Phase

Whether a substance is a solid, liquid or gas

23 of 51

Internal energy

The sum of the random distributions of kinetic and potential energies of all the molecules in the body

24 of 51

Ideal Gas

Gas that has internal energy only in the form of random kinetic energy

25 of 51

Thermal Equilibrium

Two objects at the same temperature

26 of 51

Specific heat capacity

The quantity of thermal energy required to raise the temperature of a unit mass of a substance by a unit temperature rise

27 of 51

Specific latent heat of fusion

Quantity of energy per unit mass required to change it at constant temperature from a solid into a liquid

28 of 51

Specific latent heat of vaporisation

Quantity of energy per unit mass required to change it at constant temperature from a liquid into a vapour

29 of 51

Boyle's Law

The volume of a fixed mass of gas is inversely proportional to the pressure exerted on it, provided the temperature is kept constant

30 of 51

Boltzmann Constant

Gas constant for a single molecule

31 of 51

Electric field strength

Force per unit positive charge

32 of 51

Tesla

Magnetic flux density when a wire of length one metre and carrying a current of one ampere at a right angle to the field experiences a force of one newton

33 of 51

Unified atomic mass unit

u - 1.66054X10-27

34 of 51

Weber

Unit of magnetic flux - One weber (Wb) is the magnetic flux when a magnetic field of magnetic flux density one tesla passes through an area of one sqaure metre

35 of 51

Magnetic Flux Linkage

For a coil - The magnetic flux through the coil multiplied by the number of turns on the coil

36 of 51

Faraday's Law

The magnitude of induced e.m.f. is equal to the rate at which magnetic flux is cut

37 of 51

Lenz's Law

The direction of any induced current is in a direction that opposes the flux change that causes it

38 of 51

Capacitance

The charge stored per unit potential difference. Its unit is the Farad (F). One Farad is one coulomb per volt

39 of 51

Time Constant

Containing a capacitor of capacitance C and a resistor of resistance R is given as CR

40 of 51

Nucleon

A nuclear particle, either a proton or a neutron

41 of 51

The nucleon number (A)

Number of nucleons in any nucleus

42 of 51

The proton number (Z)

The number of protons in a nucleus

43 of 51

Isotope

Two nuclides with the same number of protons but different number of neutrons

44 of 51

Activity

The rate at which a source emits radioactive particles, measured in becquerels (Bq)

45 of 51

Decay constant

Related the activity to the number of nuclei

46 of 51

Half-life

The time taken for the activity of the activity of the source to decrease by one half. It is also the time taken for the number of radioactive nuclei to decrease by one half

47 of 51

Binding energy

The energy required to separate an atom into its constituent parts

48 of 51

Acoustic Impedance

Used to determine the fraction of the intensity refracted at a boundary between two materials of different acoustic impedances

49 of 51

Hubble's Law

The speed of recession of a galaxy is directly proportional to its distance from the earth

50 of 51

Cosmological Principle

On a large scale, the universe is isotropic (same in all directions) and homogeneous (uniform density) as long as a large enough volume is used

51 of 51

## Other cards in this set

### Card 2

#### Front

The rate of change of momentum is directly proportional and acts in the same direction as the resultant force acting upon it

#### Back

Newton's Second Law

### Card 3

#### Front

If body A exerts a force on body B, then body B will exert an equal and opposite force on body A

#### Back

### Card 4

#### Front

The mass of an object multiplied by its velocity

#### Back

### Card 5

#### Front

The force that gives a mass of one kilogram an acceleration of one metre per second squared

#### Back

## Similar Physics resources:

0.0 / 5

0.0 / 5

3.0 / 5

0.0 / 5

0.0 / 5

## Comments

Report