• # Revision:Physics formulae (ocr a level)

Here are a load of forumlae for reference that need to be known about and used for A Level physics. Please add in any other formulae that you know are needed that have been missed.

## Forces in Physics

### Gravity Forces

Weight of a mass m near an object of gravity g

The value of g at a distance r from the centre of a planet of mass M (the minus is the magnitude)

The force of G between mass m and mass M

### Electrostatic Forces

The electric field strength between two charged parallel plates

The force on a charge q between two charged parallel plates

The electric field near a point or spherical charge

The force on a charge q near a point or spherical charge

### Magnetic Forces

The force on a current flowing at 90degrees to a magnetic flux density B

The force on a charge q moving at velocity v at 90degrees to a magnetic flux density B

### Others

The force produced by a stretched spring or piece of material

The force on an oscillator that is moving with simple harmonic motion

### Force and Motion Relationships

Force, acceleration and mass

Impulse and momentum

Forces and energy

## Energy in physics

### Gravitational PE

The potential energy of a mass m lifted a height h above the earth

The value of gravitational potential energy at a distance r from the centre of mass M

The PE of mass m and mass M at a distance r apart

### Electrostatic PE

The PE lost when a charge q moves through potential difference V

The PE stored in a charged capacitor

The electrical potential V near a point or spherical charge

The PE of a charge q near a point or spherical charge Q

### Others

The energy stored in a stretched spring or piece of material

The kinetic energy of a moving mass m

The energy of a simple harmonic oscillator with amplitude A

Photon energy

The energy needed to change the temerature of a material

The average energy of a particle at temperature T

## Time Speed and Distance

### Time formulae

Time to go distance s at constant velocity v

Unparseable or potentially dangerous latex formula. Error 4: no dvi output from LaTeX. It is likely that your formula contains syntax errors or worse.
\displaystyle t = \frac{2\pi \sqrt{\frac{m}{k}}

Period of oscillation (mass on a spring)

Period of oscillation (Pendulum)

Formula for radioactive half-life

Time for charge in a capacitor to half

Time for capacitor's charge to fall by 37%

The relationship between period and frequency

The relationship between power time and energy

Keplers 3rd Law:

## Comments

• Suitable for: A Level physics, espeically OCR exam board route B.
• Written by: emdiesse.
• From this thread.
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