GCSE equations

Question 1

what is the unit of acceleration?

Answer 1

m/s[2]

Question 2

Acceleration equation

Answer 2

change in speed/time taken or (v-u)/time taken

Question 3

what is the equation for working out weight?

Answer 3

mass x 9.81 (gfs)

Question 4

Equation to work out force

Answer 4

mass x acceleration

Question 5

equation to work out efficiency

Answer 5

useful energy used/total input

Question 6

equation to work out momentum(2)

Answer 6

mass x velocity

Question 7

equation to work out wave speed

Answer 7

distance/time
Or
Wavelength x frequency

Question 8

equation to work out density

Answer 8

mass/volume

Question 9

equation to work out work done

Answer 9

force x distance moved in direction of force

Question 10

equation to work out change in gravitational potential energy (AGPE) ^

Answer 10

mass x gravitational field strength x change in vertical height

Question 11

equation to work out kinetic energy

Answer 11

1/2 x mass x (speed squared)

Question 12

equation to work out power

Answer 12

• work done/time take

- energy transferred/time taken

Question 13

energy transferred equation

Answer 13

charge moved x potential difference

Question 14

charge equation

Answer 14

current x time

Question 15

potential difference equation

Answer 15

current x resistance

Question 16

electrical power

Answer 16

current x voltage

or current squared x resistance

Question 17

force exerted on a spring equation

Answer 17

= spring constant x extension

Question 18

Equation to work out moment of a force

Answer 18

Force x distance perpendicular to the direction of force

Question 18

Equation to work pressure

Answer 18

Force normal to surface/area of that surface

Question 20

Resistance

Answer 20

R = v x I
Ravioli
Voltage x current