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Flashcards in Paper 1 equations Deck (17):
1

Work done (W)

W= Fs

work done= force x distance

2

Kinetic energy (Ek)

Ek= 1/2mv

kinetic energy= 0.5 x mass x (speed)2

3

Gravitational potential energy (Ep)

Ep= mgh

gravitational potential energy= mass x gravitational field strength (g) x height

4

Power (energy transferred)

P= E/t

power= energy transferred/time

5

Power (work done)

P= W/t

power= work done/time

6

Efficiency

useful output energy transfer/total input energy transfer useful power output/total power output

7

Charge flow (Q)

Q= It

charge flow= current x time

8

Potential difference (V)

V= IR

potential difference= current x resistance

9

Power (P)

P= I2R

power= (current)2 x resistance

10

Power (P)

P= VI

power= potential difference x current

11

Energy transferred (E)

E= Pt

energy transferred= power x time

12

Energy transferred (E)

E= QV

energy transferred= charge flow x potential difference

13

Density (p)

p= m/v

density= mass/volume

14

Elastic potential energy (Ee)

Ee= 1/2ke2 

elastic potential energy= 0.5 x spring constant x (extension)2

15

Change in thermal energy

/|E= mc/|Ø

change in thermal energy= mass x specific heat capacity x temperature change

16

Thermal energy for a change of state

E= mL

thermal energy for a change of state= mass x specific latent heat

17

For gases= constant

pV= constant

pressure x volume= constant