Forces Formulas Flashcards
(23 cards)
what is the formula for density
mass/volume
calculate average speed
distance/time
average acceleration/deceleration
v-u/t
formula which links force and acceleration
f=ma
how do you calculate momentum
mass x velocity
difference between velocity and speed
velocity depends on direction of the moving object, speed doesn’t
how do you find weight
mass x gravitational force
what are moments
the turning effect of a force
how do you calculate moments
moment = force x perpendicular distance
principal of moments
f1d1 = f2d2
hooke’s law of extension
force/load = spring constant x extension
find pressure using force
pressure = force/area
pressure in a liquid/gas
pressure = desnsity x g x depth(or height)
how do you convert kelvin to celcius
-273
state boyle’s law
pressure and volume in gases of a fixed mass at a fixed temperature are inversely proportional
what is the formula used to prove boyle’s law
p1v1 = p2v2
calculate work done
work done = force x distance moved
calculate gpe
gpe = mass x g x height (or weight x height)
how do you calculate kinetic energy
1/2mv^2
how do you define power
rate of work done
formula of power
work done/time
what is efficiency
amount of useful work done
formula to find the percentage efficiency?
useful work done/total energy input x 100
