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44 Cards in this Set

  • Front
  • Back

Volume

The space an object occupies
Mass
The amount of matter in a substance
Density
mass / volume
Energy
The ability to do work
Force
Anything that causes a change in velocity

Pressure

force / area

Lever

A rigid body free to turn about a fixed point called a fulcrum

Moment

The turning effect of a force = force x distance

Momentum

mass x velocity

Law of Lever

When a lever is balanced the sum of the moments on the L.H.S. = sum of the moments on the R.H.S.

Centre of Gravity

The point at which all the bodies weight appears to act.

Weight

mass x gravity

Hooke’s Law

The extension of an elastic material is directly proportional to the applied force producing the extension.

Speed

distance / time

Velocity -

speed in a given direction i.e 50m/s north •

acceleration

change in velocity / time

Law of conservation of energy

Energy cannot be created or destroyed but can be changed from one form to another

Friction

A force between any two materials in contact with each other which opposes their motion

Work

force x distance

Temperature

is a measure of the hotness of a body

Heat

is a form of energy that moves from hotter to colder bodies

Conduction

The transfer of heat through a solid with no movement of the substance.

Convection

The transfer of heat through liquids and gases, movement of particles

Radiation

The transfer of heat through vacuum by means of waves

Latent heat

is the heat needed to change the state of a substance without changing the temperature i.e ice melting, boiling water

Power

The amount of work done per second

Current

the flow of charge (electrons) Amp.

Ohm’s Law

Voltage is proportional to current at a constant temperature.

Fuse

a thin piece of wire with a low melting point that breaks the circuit if the current is too high

Resistor

Controls the amount of current in a circuit Ohms

Insulator –

A material that does not allow charge to flow through it

A conductor

A material that allows charge to flow through it

Direct current (D.C)
The flow of charge in one direction only (battery)

Alternating current (A.C)

current that changes direction (mains)

A diode

device that allows current to flow in one direction only

Light dependent resistor (LDR)

A variable resistor whose resistance changes with the amount of light that falls on it.

Echo

Reflected sound

Ultra sound

Sound of very high pitch, not heard by humans

Refraction

The bending of light as it passes from one transparent medium to another

Luminous body

creates its own light, Sun •

Non-luminous body

Reflects light

Kinetic Energy

Energy of a moving object

Potential energy

Energy due to position / condition stretched elastic / spring

Dispersion
breaking up of white light into seven colours