## Physics laws and formulae (O level)

This list is a list of physics laws and formulae used in O level physics.

### Kinematics

#### Equations of motion with constant acceleration

### Density

### Hooke’s law

Hooke’s law – that the extension was of a material is proportional to the stretching force provided the material is not permanently stretched.

### Forces

Parallelogram law – If two forces acting at a point are represented in size and direction by the sides of a parallelogram, their resultant is represented in size and direction by the diagonal of the parallelogram drawn at that point.

Newton’s first law of motion – A body stays in its state of rest or uniform velocity unless acted upon by an external force.

AdvertisementsNewton’s second law of motion – The acceleration of a body is directly proportional to the resultant force acting on it.

Newton’s third law of motion – To every action there is an equal and opposite reaction.

### Circular motion

### Moments

Law of moments – When a body is in equilibrium the sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about the same point.

moment of a force = force × perpendicular distance of the line of action of the force from the pivot

### Momentum

### Work, energy and power

Law of conservation of energy – energy can neither be created nor destroyed but can be converted from one form to another.

### Pressure

### Gas Laws

Boyle’s law – The pressure of a fixed mass of gas is inversely proportional to its volume if its temperature is kept constant.

Charles’s law – The volume of a fixed mass of gas is directly proportional to its absolute temperature if the pressure is kept constant.

Pressure law – The pressure of a fixed mass of gas is directly proportional to its absolute temperature if the volume is kept constant.

### Thermal Physics

### Waves and optics

Law of reflection – The angle of incidence is equal to the angle of reflection.

### Magnetism

- Law of magnetic attraction – Like poles repel, unlike poles attract.

### Electricity

Law of electrostatic attraction – Like charges repel, unlike charges attract.

Ohm’s law – The current in an ohmic conductor is directly proportional to the p.d. across its ends if the temperature is kept constant.

#### Resistors in series

#### Resistors in parallel

### Electromagnetism

Faraday’s law – The size of the induced p.d. is directly proportional to the rate at which the conductor cuts magnetic field lines.

Lenz law – The direction of the induced current is such as to oppose the change causing it.

Chipasha KMVery nice and to the point revision notes

I wish you can include the rest of topics like atomic physics and basics electronic.