Equations

Question 1

What is the equation for calculating GPE

Answer 1

GPE = mass (kg) X Gravitational Field Strength (m/s) X height (m)

Question 2

What is the equation for calculating Kinetic Energy

Answer 2

KE = 1/2 m v2

Question 3

What is the equation for Power

Answer 3

Power = Work done/time taken or P = w/t

Question 4

What is the equation for Energy Efficiency

Answer 4

Energy Efficiency = Useful energy output/total energy input (X 100 to make into %)

Question 5

Equation for Density

Answer 5

Density = Mass/Volume or d = m/v

Question 6

Equation for Pressure

Answer 6

Pressure = force/ area or p = F/A

Question 7

Equation for Force

Answer 7

Force = mass X area

Question 8

Equation for Weight

Answer 8

Weight = mass X gravitational field strength

Question 9

Equation for Work done

Answer 9

Work done = force X distance traveled in the direction of the force

Question 10

Equation for Average Speed

Answer 10

Average Speed = distance/time

Question 11

Equation for Acceleration

Answer 11

Acceleration = change in velocity/time taken

Question 12

Equation for Wave speed

Answer 12

Wave speed = frequency X wave length

Question 13

Equation for Frequency

Answer 13

Frequency = 1/period

Question 14

Snells Law

Answer 14

n = sin i/sin r

Question 15

How do you find the critical angle

Answer 15

sin(c)= 1/n

Question 16

Equation for energy

Answer 16

Energy= charge X voltage

Question 17

Equation for charge

Answer 17

charge= current X time

Question 18

Equation for voltage

Answer 18

Voltage= current X resistance

Question 19

Equation for power

Answer 19

Power= current X voltage

Question 20

Equation for energy

Answer 20

Energy= voltage X current time