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