Revision:Physics Formulae (OCR A Level)

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Revision:Physics Formulae (OCR A Level)

TSR Wiki > Study Help > Subjects and Revision > Revision Notes > Mathematics > 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

$\displaystyle F = mg$

Weight of a mass m near an object of gravity g

$\displaystyle g = \frac{(-)GM}{r}$

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

$\displaystyle F = \frac{GMm}{r^2}$

The force of G between mass m and mass M

Electrostatic Forces

$\displaystyle E = \frac{V}{d}$

The electric field strength between two charged parallel plates

$\displaystyle F = \frac{qV}{d}$

The force on a charge q between two charged parallel plates

$\displaystyle E = \frac{kQ}{r^2}$

The electric field near a point or spherical charge

$\displaystyle F = \frac{KQq}{r^2}$

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

Magnetic Forces

$\displaystyle F = BIl$

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

$\displaystyle F = Bqv$

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

Others

$\displaystyle F = kx$

The force produced by a stretched spring or piece of material

$\displaystyle F = -ks$

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

Force and Motion Relationships

$\displaystyle F = ma$

Force, acceleration and mass

$\displaystyle Ft = \Delta p$

Impulse and momentum

$\displaystyle E = FD$

Forces and energy

Energy in physics

Gravitational PE

$\displaystyle PE = mgh$

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

$\displaystyle Vg = \frac{-GM}{r}$

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

$\displaystyle PE = \frac{-GMm}{r}$

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

Electrostatic PE

$\displaystyle E = qV$

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

$\displaystyle E = \frac{1}{2}CV^2$

The PE stored in a charged capacitor

$\displaystyle V = \frac{kQ}{r}$

The electrical potential V near a point or spherical charge

$\displaystyle PE = \frac{kQq}{r}$

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

Others

$\displaystyle E = \frac{1}{2}kx^2$

The energy stored in a stretched spring or piece of material

$\displaystyle KE = \frac{1}{2}mv^2$

The kinetic energy of a moving mass m

$\displaystyle E = \frac{1}{2}ka^2$

The energy of a simple harmonic oscillator with amplitude A

$\displaystyle E = hf$

Photon energy

$\displaystyle E = mC\Delta \theta$

The energy needed to change the temerature of a material

$\displaystyle E = kT$

The average energy of a particle at temperature T

Time Speed and Distance

Time formulae

$\displaystyle t = \frac{s}{v}$

Time to go distance s at constant velocity v

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\displaystyle t = \frac{2\pi \sqrt{\frac{m}{k}}

Period of oscillation (mass on a spring)

$\displaystyle t = 2\pi \sqrt{\frac{l}{g}}$