4th - Equations

Question 1

force, distance moved, work done

Answer 1

Work done = force x distance moved
E = Fd

Question 2

Energy transferred, work done

Answer 2

Work done = energy transferred

Question 3

Mass, height, gravitational potential energy, gravitational field strength

Answer 3

Gravitational potential energy = mass x gravitational field strength (10 on earth) x height

Question 4

Mass, kinetic energy, speed

Answer 4

Kinetic energy = 1/2 x mass x speed2
KE = 1/2 x m x v2

Question 5

Work done, time taken, power

Answer 5

Power = work done / time taken
P = E/t

Question 6

Current, power, voltage

Answer 6

Power = current x voltage
P = IV

Question 7

Current, voltage, energy transferred, time

Answer 7

Energy transferred = current x voltage x time
E = IVt

Question 8

Charge, current, time

Answer 8

Charge = current x time
Q = It

Question 9

Angle of incidence, angle of refraction, refractive index

Answer 9

N = sin ( i ) / sin ( r )

Refractive index = angle of incidence / angle of refraction

Question 10

Refractive index, critical angle

Answer 10

N = 1/ sin ( c )

Refractive angle = 1/ critical angle

Question 11

Current, voltage, resistance

Answer 11

Voltage = current x resistance
V = IR

Question 12

Charge,voltage, energy transferred

Answer 12

Energy transferred = charge x voltage
E = QV

Question 13

Mass, gravitational field strength, weight

Answer 13

Weight = mass x gravitational field strength
W = mg

Question 14

Efficiency, total energy output, useful energy output

Answer 14

Efficiency = useful energy output / total energy output