Equations

Question 1

Equation for speed

Answer 1

Speed = distance / time

Question 2

Equation for acceleration?

Answer 2

Change in velocity / time taken

Question 3

Equation for weight?

Answer 3

Mass x gravitational field strength

Question 4

Equation for force?

Answer 4

Force = mass x acceleration

Question 5

Equation for force acting (impulse) ?

Answer 5

Force acting = change in momentum / time taken for change to happen

Question 6

Equation for momentum?

Answer 6

Momentum = mass x velocity

Question 7

Equation for moments?

Answer 7

Moment = force x perpendicular distance from pivot

Question 8

Equation for electrical power?

Answer 8

Power = current x voltage

Question 9

Equation for energy transferred?

Answer 9

Energy transferred = current x voltage x time

Question 10

Equation for voltage?

Answer 10

Voltage = current x resistance

Question 11

Equation for charge?

Answer 11

Charge = current x time

Question 12

Equation for wave speed?

Answer 12

Wave speed = frequency x wavelength

Question 13

Equation for refractive index according to snell’s law?

Answer 13

N = sin i / sin r

Question 14

Equation for refractive index?

Answer 14

Reflective index = speed of light in a vacuum / speed of light in that material

Question 15

Equation for critical Angle?

Answer 15

Sin C = 1 / n

Question 16

Equation for efficiency?

Answer 16

Efficiency = useful energy output / total energy output

Question 17

Equation for work done?

Answer 17

Work done = force x distance

Question 18

The equation for power invoking work done?

Answer 18

Power = work done / time taken

Question 19

Equation for kinetic energy?

Answer 19

Kinetic energy = 1/2 x mass x velocity ^2

Question 20

Equation for gravitational potential energy?

Answer 20

G.P.E = m x g x h

Question 21

Equation for density?

Answer 21

Density = mass / volume

Question 22

Equation for pressure?

Answer 22

Pressure = force / area

Question 23

Equation for pressure difference ?

Answer 23

Pressure difference = height x density x g

Question 24

Equation involving content pressure and volume?

Answer 24

P1 x v1 = P2 x v2

Question 25

Equation involving constant pressure and temperature?

Answer 25

P1 / T1 = P2 / T2

Question 26

Equation for transformers involving voltage and no. Turns ?

Answer 26

Input (primary) voltage / output (secondary) voltage = no. turns on primary / no. turns on secondary

Question 27

Equation for transformers involving voltage and current?

Answer 27

Vp x Ip = Vs x Is