Physics AS definitions

Change in velocity divided by time taken

Distance travelled divided by time taken

Displacement divided by time taken

The straight line distance from a reference point in a single specified direction

Quantities that have both magintude and direction

Quantities that are fully defined by by magnitude only

• No resultant force
• No resultant moment

Force multiplied by the perpendicular distance from the line of action of the force to the pivot

Sum of clockwise moments is equal to sum of anti-clockwise moments when the object is in equilibrium about the same pivot

The single point where the entire weight of a body appears to act

A pair of equal and opposite forces whose lines of action do not coincide

One of the forces multiplied by the perpendicular distance between the forces

Mass divided by volume

Force divided by area

Force divided by extension

Extension is directly proportional to force provided the elastic limit has not been exceeded

Force divided by cross-sectional area

Extension divided by original length

Tensile stress divided tensile strain

Can be easily and permenantly stretched into thin wires

Materials return to their original shape and size when the applied force is removed

The maximum load up to which the material can regain its original shape and size when the load is removed

Material does not return to its original shape and size when the load is removed

The force of gravity on the mass of a body

The work done when a force of 1N moves its point of application by 1m in the direction of the force

The energy of a body due to movement

The force needed to give an acceleration of 1ms^-2 to a mass of 1kg

The energy a body has due to its position

Work done divided by time

Force multiplied by distance moved in the direction of the force

Distance travelled from when the brakes are applied until the car comes to a stop

• Distance travelled during the drivers reaction time before the brakes are applied
• =speed x reaction time

Thinking distance + braking distance

The maximum stress a material can withstand before fracture

• 
• 
• Area under F-x graph

= speed x reaction time

velocity

acceleration

displacement