physics equations

pressure

pressure x volume = constant value

charge

current x time = charge

forcé

forcé = spring constant x extension

wave speed

wave speed = wavelength x frequency

critical angle

critical angle = 1/n

electricity power

power = current x voltage

frequency

frequency = 1/ time period

efficiency

efficiency = useful output/ total input

pressure

pressure = mass/ volume

force

force = mass x gravity

work done

work done = force x distance

KE

KE = ½ m v*2

GPE

GPE= mgh

n

n = sin i/ sin r

force

f = ma

acceleration

a= v-u/t

pressure

p= hpg

celsius to kelvin

+273

motor effect

a current carrying wire will experience force in a magnetic field

SINC

S- steel

I- iron

N- nickel

C- colbalt

what’s weight measured in?

Newtons

what’s mass measured in?

kg

what’s newton’s first law?

If an object is travelling at a certain speed it will continue at the same speed unless acted upon by a resultant force

what’s newton’s second law?

F=ma

what’s newton’s third law?

when an action happens an equal and opposite action occurs

what’s the difference between velocity and speed?

velocity is speed with a direction

eg 30mph north

even if something is moving at a constant speed if it’s changing direction it’s velocity is changing

speed

s= d/t

what’s acceleration?

how quickly velocity is changing

what’s a distance time graph?

shows how far something has travelled

what does the

flat

curve

gradient show?

flat - stopped

curve- acceleration or deceleration

gradient- constant speed

what does

flat- constant speed

curve - changing acceleration

gradient- acceleration or deceleration

velocity time graph

what’s the difference between mass and weight?

mass is the amount of stuff that’s make up an object and remains the same. any where in the universe, however weight is the force of gravity acting upon the object

what’s gravity?

a force of attraction between to objects

what are all the types of forces?

gravity or weight

electrostatic

thrust ( push or pull)

drag

air resistance

friction

tension

lift

what’s resultant force

the overall force from adding or subtracting two forces

what’s a vector?

size and direction

usually represented by arrows - acceleration force velocity momentum

what’s scalar

only size

mass temperature time length

what’s terminal velocity?

the maximum velocity something can go or when acceleration is reduced by resistance until the two are equal

what’s hookes law?

extension is proportional to force