Physic equations

Question 1

Work done

Answer 1

Work done = force applied x distance moved w = Fs

Question 2

Change in objects gravitational potential energy store

Answer 2

Change in objects gravitational potential energy store = weight x change in height `

Question 3

Change in objects gravitational potential energy store

Answer 3

Change in objects gravitational potential energy store = mass x gravitational field strength x change of height

Question 4

kinetic energy

Answer 4

1/2 x mass x speed^2 1/2mv^2

Question 5

elastic potential energy

Answer 5

1/2 x spring constant x extension^2 1/2ke^2

Question 6

efficiency

Answer 6

useful energy transferred by the device / total input energy supplied to the device x 100

Question 7

power

Answer 7

energy transferred to applience / time taken for the energy to be transferred p = e/t

Question 8

energy transferred

Answer 8

energy transferred = mass x specific heat capacity x temperature change

Question 9

charge flow

Answer 9

current x time q = it

Question 10

potential difference

Answer 10

energy transferred / charge

v = e/q

Question 11

resistance

Answer 11

potential difference / current

r = v/i

Question 12

current

Answer 12

potential difference/component resitance i = v/r

Question 13

energy transferred from mains

Answer 13

power x time e = p x t

Question 14

power

Answer 14

current x potential difference p = i x v

Question 15

density

Answer 15

mass / volume p = m/v

Question 16

specific latent heat of fusion

Answer 16

energy / mass l = e / m

Question 17

specific latent heat of vapourisation

Answer 17

energy / mass l = e / m

Question 18

pressure x volume is

Answer 18

constant