equations

Question 1

Kinetic energy

Answer 1

Ke = 1/2 mv ^ 2

Question 2

GPE

Answer 2

GPE = mass * gravitational field strength * height

Question 3

efficiency

Answer 3

effiiciency = useful energy input/ total energy input

Question 4

charge flow

Answer 4

charge flow = current * time

Question 5

potential difference

Answer 5

pd = current * resistance

Question 6

total resistance

Answer 6

total resistance = r1 + r2

Question 7

Power with pd

Answer 7

Power = current * potential difference (P=IV)

Question 8

Power with resistance

Answer 8

power = (current)^2 * resistance

Question 9

Energy transferred with charge flow

Answer 9

Energy transferred = charge flow * potential difference

Question 10

Energy transferred with power

Answer 10

energy transferred = power * time

Question 11

.Density

Answer 11

density = mass/volume

Question 12

Weight

Answer 12

weight = mass * gravitational field strength

Question 13

work done

Answer 13

work done = force * distance

Question 14

spring constant

Answer 14

force = spring constant * extension

Question 15

moment

Answer 15

moment = force * distance (perpendicular to that force)

Question 16

pressure

Answer 16

pressure = force normal to a surface/ area of that surface

Question 17

distance traveled

Answer 17

distance = speed * time

Question 18

acceleration

Answer 18

change in velocity/ time taken

Question 19

resultant force

Answer 19

f = ma

Question 20

momentum

Answer 20

momentum = mass * velocity

Question 21

Power w work done or energy transferred

Answer 21

work done/ time taken