Physics Formulae

Question 1

Relationship between average speed, distance moved and time taken

Answer 1

Average speed= total distance moved /total time taken

Question 2

Relationship between resultant force mass and acceleration

Answer 2

Force = mass x acceleration

Question 3

Relationship between acceleration, change in velocity and time taken

Answer 3

Acceleration= change in velocity/time taken

Question 4

Relationship between momentum, mass and velocity

Answer 4

Momentum = mass x velocity

Question 5

Relationship between density, mass and volume

Answer 5

Density= mass / volume

Question 6

Relationship between work done, force and distance moved

Answer 6

Work done= force x distance moved in direction of force

Question 7

Relationship between energy transferred and work done

Answer 7

Work done = energy transferred

Question 8

Equation for the kinetic energy of a body

Answer 8

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

Question 9

Equation for the gravitational potential energy of a body

Answer 9

Gravitational potential energy =
mass x gravitational field strength x height

Question 10

Relationship between mass, weight and gravitational field strength

Answer 10

Weight= mass x gravitational field strength

Question 11

Relationship between an applied force, the area over which it acts and the resulting pressure

Answer 11

Pressure = force / area

Question 12

The relationship between the moment of a force and its perpendicular distance from the pivot

Answer 12

Moment= force x perpendicular distance from the pivot

Question 13

Relationship between charge, current and time

Answer 13

Charge = current x time

Question 14

Relationship between voltage, current and resistance

Answer 14

Voltage = current x resistance

Question 15

Relationship between electrical power, voltage and current

Answer 15

Electrical power = voltage x current

Question 16

Relationship between energy transferred, charge and voltage

Answer 16

Energy transferred= charge x voltage

Question 17

Relationship between wave speed, frequency and wavelength

Answer 17

Wave speed= frequency x wavelength

Question 18

Relationship between turns and voltage for a transformer

Answer 18

Input(primary) voltage/ output(secondary) voltage =
Primary turns/ secondary turns

Question 19

Relationship between refractive index, angle of incidence and angle of refraction

Answer 19

Refractive index=
sin (angle of incidence) /
sin (angle of refraction)

Question 20

Relationship between critical angle and refractive index

Answer 20

Sin (critical angle) = 1/ refractive index

Question 21

Relationship for efficiency

Answer 21

Efficiency=
(useful output/ total output) x 100

Question 22

Relationship for pressure difference

Answer 22

Pressure difference= height x density x gravitational field strength

Question 23

Relationship for input and output power for a 100% efficient transformer

Answer 23

Input power = output power

Question 24

Relationship between input(primary) voltage and current and output(secondary) voltage and current for a 100% efficient transformer

Answer 24

Primary Voltage x primary current = secondary voltage x secondary current

Question 25

Relationship between stopping distance, thinking distance and braking distance

Answer 25

Stopping distance =
thinking distance + braking distance