# A2 Physics Definitions

0.0 / 5

HideShow resource information

Newton's 1st Law

A body will continue to remain at rest or continue to move with constant velocity unless acted upon by a force

1 of 38

Newton's 2nd Law

Force is proportional to the rate of change of momentum

2 of 38

Newton's 3rd Law

When one body exerts a force on another body, the other body exerts a force that is equal in magnitude and opposite in direction on the first body

3 of 38

Impulse

Force x time which force acts

4 of 38

Elastic Collision

Collision in which kinetic energy is conserved

5 of 38

Inelastic Collision

Collision in which kinetic energy is not conserved, some is lost to the surroundings as heat

6 of 38

Gravitational Field Strength

Force per unit mass at a point in a gravitational field

7 of 38

Angular frequency

Product of 2pi x frequency

8 of 38

Simple Harmonic Motion (SHM)

Acceleration is proportional to displacement from the equilibrium position, and acceleration is always towards the equilibrium position

9 of 38

Internal Energy

Total of randomly distributed kinetic energy and potential energy of molecules

10 of 38

Boyle's Law

Pressure is inversely proportional to volume for a fixed mass of gas at a constant temperature

11 of 38

Latent Heat of Fusion

Thermal energy required to change a solid into a liquid at a constant temperature

12 of 38

Latent Heat of Vaporisation

Thermal energy required to change a liquid into a gas at a constant temperature

13 of 38

Electric Field Strength

Force per unit charge

14 of 38

Magnetic Flux Density

Amount of magnetic flux per unit area

15 of 38

Tesla

Magnetic flux density is 1 tesla when a wire carrying a current of 1A placed at right angles to the magnetic field experiences a force of 1N per metre of its length

16 of 38

Weber

Equal to one tesla metre squared

17 of 38

Magnetic Flux Linkage

Product of magnetic flux and number of turns on the coil

18 of 38

Lenz's Law

Any induced emf will be established to in a direction so as to produce effects which oppose that change that is producing it

19 of 38

Faraday's Law

Induced emf is proportional to the rate of change of magnetic flux linkage

20 of 38

Capacitance

Charge per unit potential difference

21 of 38

Farad

Coulomb per volt

22 of 38

Time Constant

Time taken for the p.d., charge stored or current to fall to 1/e of its initial value. Calculated by CxR

23 of 38

Nuclide

A specific combination of protons and neutrons in a nucleus

24 of 38

Activity

The rate at which radioactive nuclei decay

25 of 38

Decay Constant

Probability of decay of a nucleus per unit time

26 of 38

Half Life

Time taken for the activity of a radioactive substance to fall by half

27 of 38

Binding Energy

The minimum energy needed to separate all of the nucleons in a nucleus

28 of 38

Binding energy per nucleon

The minimum energy needed to separate all of the nucleons in a nucleus divided by the total number of nucleons

29 of 38

Parsec

The distance an object must be from the earth to give a parallax angle of 1 arc per second

30 of 38

Light year

The distance traveled by light through a vacuum in one year

31 of 38

Olbers' Paradox

For a universe infinite in size, static, and with uniformly distributed matter, the night sky should be bright because of light received in all directions from stars.

32 of 38

Hubble's Law

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

33 of 38

Cosmological Principle

The distribution of matter in the universe is homogeneous (evenly distributed) and isotropic (same in all directions) when viewed on a large enough scale

34 of 38

H(0)

About 2.3 x 10^-18 s^-1. Ratio of the speed of a receding galaxy to its distance from the earth

35 of 38

Critical Density

The average density the universe would need to be in order for the fate of the universe to be flat. Value = 9.5 x 10^-27 kg/m^3

36 of 38

Beta Plus Decay

A positron emitted from a nucleus that has undergone nuclear decay

37 of 38

Beta Minus Decay

An electron emitted from a nucleus that has undergone nuclear decay

38 of 38

## Other cards in this set

### Card 2

#### Front

Force is proportional to the rate of change of momentum

#### Back

Newton's 2nd Law

### Card 3

#### Front

When one body exerts a force on another body, the other body exerts a force that is equal in magnitude and opposite in direction on the first body

#### Back

### Card 4

#### Front

Force x time which force acts

#### Back

### Card 5

#### Front

Collision in which kinetic energy is conserved

#### Back

## Similar Physics resources:

1.0 / 5

0.0 / 5

4.5 / 5

0.0 / 5

0.0 / 5

## Comments

No comments have yet been made