Revision:Physics Formulae (OCR A Level)

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Revision:Physics Formulae (OCR A Level)

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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.

1 Forces in Physics
2 Energy in physics
3 Time Speed and Distance
- 3.1 Time formulae
4 Laws
5 Comments

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 hieght 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

[Unparseable or potentially dangerous latex formula. Error 6 ]

Period of oscillation (mass on a spring)

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

Period of oscillation (Pendulum)

$\displaystyle t = \frac{\ln 2}{\lambda}$

Formula for radioactive half-life

$\displaystyle t = 0.69RC$

Time for charge in a capacitor to half

$\displaystyle t = RC$

Time for capacitor's charge to fall by 37%

$\displaystyle t = \frac{1}{f}$

The relationship between period and frequency

$\displaystyle t = \frac{E}{P}$

The relationship between power time and energy

Laws

Keplers 3rd Law: $\displaystyle t^2 = r^3$

Comments

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

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Contents

Forces in Physics

Gravity Forces

Electrostatic Forces

Magnetic Forces

Others

Force and Motion Relationships

Energy in physics

Gravitational PE

Electrostatic PE

Others

Time Speed and Distance

Time formulae

Laws

Comments