Equations

Question 1

Weight

Answer 1

Mass x gravitational field strength (W=m x g)

Question 2

Work done

Answer 2

Force x distance (W= F x s)

Question 3

Force applied to a spring

Answer 3

Spring constant x extension (F= k x e)

Question 4

Distance travelled

Answer 4

Speed x time (s= v x t)

Question 5

Acceleration

Answer 5

Change in velocity/ time taken (a=^v/t)

Question 6

Resultant force

Answer 6

Mass x acceleration (F = m x a)

Question 7

Momentum

Answer 7

Mass x velocity (p = m x v)

Question 8

Kinetic energy

Answer 8

0.5 x mass x (speed)2 [E = m x (v)]

Question 9

Gravitational potential energy

Answer 9

mass x gravitational field strength (g) x height (Ep = m x g x h)

Question 10

Power (energy transferred)

Answer 10

Energy transferred/time (P = E/t)

Question 11

Power (work done)

Answer 11

Work done/time (P = W/t)

Question 12

Efficiency (energy transfer)

Answer 12

Useful output energy transfer/total input energy transfer

Question 13

Efficiency (power)

Answer 13

Useful power output/total power input

Question 14

Wave speed

Answer 14

Frequency x wavelength (v= f x §)

Question 15

Charge flow

Answer 15

Current x time (Q = I x t)

Question 16

Potential differency

Answer 16

Current x resistance (V = I x R)

Question 17

Power ( potential difference)

Answer 17

Potential difference x current (P = V x I)

Question 18

Power (current)

Answer 18

(Current) 2 x resistance ( P = I x R)

Question 19

Energy transferred (transfer red power)

Answer 19

Power x time ( E = Pxt)

Question 20

Energy transferred (transfer red charge flow)

Answer 20

Charge flow x potential difference ( E = Q x V)

Question 21

Density

Answer 21

Mass/volume (p=m/v)