All Physics Topics (Mixed)

System

An object or a group of objects

A system can be changed by …

Heating, Work done by forces, work done when a current flows

Closed system

An isolated system where no energy transfers take place in and out of the system

Energy can be …

Transferred, Stored, or Dissipated

Work done

When a force causes an object to move through a distance

Formula for work done

W = F / s

Mass

Amount of matter in an object, measured in kg

Weight

The force acting on an object due to gravity, measured in N

Formula for weight

W = mg

Formula for gravitational potential energy

Ep = mgh

Formula for kinetic energy

Ek = ½ mv²

Formula for elastic potential energy

Ee = ½ ke²

Efficiency

The proportion of input energy that is usefully transferred

Formula for efficiency

Eff. = useful energy / total energy

Power

The rate at which energy is transferred / work is done

Formula for power

P = E / t

1 J per second is what in power

Power of 1 W

The higher the power rating … (energy related)

The more energy is transferred in a given time

What is this unit measured in and what is its symbol: work done

Joules, W

What is this unit measured in and what is its symbol: force

Newtons, F

What is this unit measured in and what is its symbol: distance

Metres, s

What is this unit measured in and what is its symbol: weight

Newtons, W

What is this unit measured in and what is its symbol: mass

Mass, m

What is this unit measured in and what is its symbol: gravitational field strength

N/kg, g

What is this unit measured in and what is its symbol: height

Metres, h

What is this unit measured in and what is its symbol: gravitational potential energy

Joules, Ep

What is this unit measured in and what is its symbol: kinetic energy

Joules, Ek

What is this unit measured in and what is its symbol: speed

M/S, v

What is this unit measured in and what is its symbol: elastic potential

Joules, Ee

What is this unit measured in and what is its symbol: spring constant

N/m, k

What is this unit measured in and what is its symbol: extension

Metres, e

What is this unit measured in and what is its symbol: power

Watts, P

What is this unit measured in and what is its symbol: energy transferred

Joules, E

What is this unit measured in and what is its symbol: time

Seconds, t