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Flashcards in equations Deck (25):
1

weight

weight = mass x gravitational field strength
W = m x g

2

work done

work done = force x distance (along a line of action of the force)
W = F x s

3

force applied to a spring

force applied to a spring = spring constant x extension
F = K x e

4

moment of a force

force x distance(normal to the direction of travel)
M = F x d

5

pressure

force / area
p = F / A

6

distance travelled

distance travelled = speed x time
s = v / t

7

acceleration

acceleration = change in velocity / time taken
a = Δv / t

8

resultant force

resultant force = mass x acceleration
F = m x a

9

momentum

momentum = mass x velocity
p = m x v

10

kinetic energy

kinetic energy = 0.5 x mass x (speed)²
Ek = 1/2m x v²

11

gravitational potential energy

gravitational potential energy = mass x gravitational field strength x height
Ep = m x g x h

12

power 1

power = energy transferred / time
P = E / t

13

power 2

power = work done / time
P = W / t

14

efficiency 1

useful output energy transfer / total input energy transfer

15

efficiency 2

useful power output / total power input

16

wave speed

wave speed = frequency x wavelength
v = f x λ

17

charge flow

charge flow = current x time
Q = I x t

18

potential difference

potential difference = current x resistance
V = I x R

19

power 3

power = potential difference x current
P = V x I

20

power 4

power = (current)² x resistance
P = I² x R

21

energy transferred 1

energy transferred = power x time
E = P x t

22

energy transferred 2

energy transferred = charge flow x potential difference
E = Q x V

23

density

density = mass / volume
p = m / v

24

change in thermal energy

change in thermal energy = mass x specific heat
latency x temperature
change
ΔE = MCΔθ

25

power 3

power = current² x resistance
P = I² x R