formulae for forces test

Question 1

distance =?

Answer 1

distance = speed x time

d

s t

Question 2

acceleration = ?

Answer 2

acceleration = change in velocity
—————————
time

Question 3

uniform acceleration =?

Answer 3

final velocity - initial velocity = 2 x a x d

v² - u² = 2 x a x d

Question 4

force =?

Answer 4

F = m x a

F

m a

Question 5

weight =?

Answer 5

mass x gravitational field strength

W

m g

Question 6

momentum =?

Answer 6

mass x velocity

p

m v

Question 7

force (with mom) =?

Answer 7

change in momentum
——————————
time

F = (mv - mu)
————
t

Question 8

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

Answer 8

1/2 x m x v² = F x d

Question 9

KE = ?

Answer 9

KE = 0.5 x m x (speed)²

KE = 1/2 m x v²

Question 10

ΔGPE= ?

Answer 10

ΔGPE = m x g x Δh

Question 11

efficiency = ?

Answer 11

efficiency = useful energy
——————
total energy

Question 12

work done =?

Answer 12

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

E = F x d

E

F d

Question 13

power =?

Answer 13

power = work done
—————
time taken
E

p t

Question 14

moment of a force = ?

Answer 14

moment of a force = force x distance