Flashcards in Key equations Deck (14):

1

## Average speed =

### Distance / time

2

## Distance =

### Average speed x time

3

##
Acceleration =

And another version which starts with v^2 - u^2 = ...

###
Change in velocity / time taken

a= (v-u)/t

V^2 - u^2 = 2 x a x X

X stands for distance

4

## What is Newton’s second law? The equation for force?

### F=m x a

5

## Weight=

###
Mass x gravitational field strength

W = m x g

6

## What is Earths gravitational field strength?

###
10 N/kg

9.81 rounded

7

## Momentum =

###
Mass (kg) x velocity

P = m x v

8

## Change in gravitational potential energy (Joules)=

###
Mass x gravitational field strength x change in vertical height

^GPE = m x g x ^h

9

## Kinetic energy (Joules) =

### 1/2 x m x v^2

10

## Efficiency =

### Useful energy transferred / total energy supplied

11

##
Wave velocity =

State both equations

###
Wave velocity = frequency x wavelength

Wave velocity = distance / time

12

## What is the equation for force which includes momentum ?

###
Force = change in momentum / time

F = (mv - mu) / t

13

## What is the equation for work done?

### Work done = force x distance

14