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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

What is the equation for power? A measure of how quickly work done is being done

Power = work done / time