# formulae for forces test Flashcards

distance =?

distance = speed x time

d

s t

acceleration = ?

acceleration = change in velocity

—————————

time

uniform acceleration =?

final velocity - initial velocity = 2 x a x d

v² - u² = 2 x a x d

force =?

F = m x a

F

m a

weight =?

mass x gravitational field strength

W

m g

momentum =?

mass x velocity

p

m v

force (with mom) =?

change in momentum

——————————

time

F = (mv - mu)

————

t

energy in a car’s KE store = work done by the brakes

1/2 x m x v² = F x d

KE = ?

KE = 0.5 x m x (speed)²

KE = 1/2 m x v²

ΔGPE= ?

ΔGPE = m x g x Δh

efficiency = ?

efficiency = useful energy

——————

total energy

work done =?

work done = force x distance moved in the direction of the force

E = F x d

E

F d

power =?

power = work done

—————

time taken

E

p t

moment of a force = ?

moment of a force = force x distance