Physics Key Equations and Units

Question 1

What is the Equation for Power?

Answer 1

Power = Voltage x Current (P = V x l)

Question 2

What is the Equation for Voltage?

Answer 2

Voltage = Current x Resistance (V = I x R)

Question 3

What is the equation for Charge?

Answer 3

Charge = Current x Time (Q = I x T)

Question 4

What is the equation for Energy?

Answer 4

Energy = Voltage x Charge (E = V x Q)

Question 5

What is the other equation for Energy?

Answer 5

Energy = Voltage x Current x Time (E = V x I x T)

Question 6

What is the Transformer Equation?

Answer 6

Primary Voltage/ = Number of Turns on Primary Coil/

Secondary Voltage= Number Turns on Secondary Coil

Question 7

What is the Equation for Total Cost?

Answer 7

Number of Units x Cost Per Unit

Question 8

What is the Equation for Efficiency (%) ?

Answer 8

(Useful Energy Out ÷ Total Energy in) x 100

Question 9

What is the equation for GPE?

Answer 9

GPE = mgh or GPE= Mass x Gravity x Height

Question 10

What is the equation of Kinetic Energy (KE)?

Answer 10

Kinetic Energy = 0.5 x Mass x Velocity² or KE = 1/2mv²

Question 11

What is the equation for Work Done (W)?

Answer 11

Work Done = Force x Distance or W= F x d

Question 12

What does Work Done also equal?

Answer 12

Work Done is also equal to Energy transferred

Question 13

What is the equation for Power?

Answer 13

Power = Energy / Time or P = E / t

Question 14

What is the Equation for Energy (relative to Specific Heat Capacity)?

Answer 14

Energy = Specific Heat Capacity x Mass x Change in Temperature or E = c x m x θ

Question 15

What is the Equation for Speed?

Answer 15

Speed = Distance ÷ Time or s = d ÷ t

Question 16

What is the equation for Acceleration?

Answer 16

Acceleration = Change in Velocity ÷ Time or a = (v-u) ÷ t

Question 17

What is the equation for Force?

Answer 17

Force = Mass x Acceleration or F = m x a

Question 18

What is the equation for Weight?

Answer 18

Weight = Mass x Gravity or w = m x g

Question 19

What is the equation for Change in Momentum?

Answer 19

Change in Momentum = Force x Time or (mv - mu) = F x t

Question 20

What is the equation for Momentum?

Answer 20

Momentum = Mass x Velocity or p = m x v

Question 21

What is the equation for Density?

Answer 21

Density = Mass ÷ Volume or d = m ÷ v

Question 22

What is the equation for Pressure?

Answer 22

Pressure = Force ÷ Area or p = F ÷ a

Question 23

What is the equation for Moment?

Answer 23

Moment = Force x Perpendicular Distance from Pivot or m = F x d

Question 24

What is the equation for Velocity?

Answer 24

Velocity = Frequency x Wavelength or v = f x λ