physics equations

Question 1

What is the formula for force?

Answer 1

force = mass x acceleration

Question 2

What is the formula for kinetic energy?

Answer 2

kinetic energy = 0.5 x mass x (speed)²

Question 3

What is the formula for momentum?

Answer 3

momentum = mass x velocity

Question 4

What is the formula for work done?

Answer 4

work done = force x distance (along the line of action of the force)

Question 5

What is the formula for power?

Answer 5

power = work done ÷ time

Question 6

What is the formula for efficiency?

Answer 6

efficiency = output energy transfer ÷ input energy transfer

Question 7

What is the formula for gravity force?

Answer 7

gravity force = mass x gravity constant (g)

Question 8

What is the formula for potential energy in a gravity field?

Answer 8

potential energy = mass x height x gravity constant (g)

Question 9

What is the formula for force exerted by a spring?

Answer 9

force exerted by a spring = extension x spring constant

Question 10

What is the formula for the moment of a force?

Answer 10

moment of a force = force x distance (normal to direction of the force)

Question 11

What is the formula for distance travelled?

Answer 11

distance travelled = speed x time

Question 12

What is the formula for acceleration?

Answer 12

acceleration = change in velocity ÷ time

Question 13

What is the formula for wave speed?

Answer 13

wave speed = frequency x wavelength

Question 14

What is the formula for charge flow?

Answer 14

charge flow = current x time

Question 15

What is the formula for potential difference?

Answer 15

potential difference = current x resistance

Question 16

What is the formula for power in terms of potential difference and current?

Answer 16

power = potential difference x current = (current)² x resistance

Question 17

What is the formula for energy transferred?

Answer 17

energy transferred = power x time = charge flow x potential difference

Question 18

What is the formula for density?

Answer 18

density = mass ÷ volume

Question 19

What is the formula for pressure?

Answer 19

pressure = force normal to a surface ÷ area of that surface

Question 20

What is the relationship for final and initial velocity?

Answer 20

(final velocity)² - (initial velocity)² = 2 x acceleration x distance

Question 21

What is the formula for change in thermal energy?

Answer 21

change in thermal energy = m x specific heat capacity x change in temperature

Question 22

What is the formula for thermal energy for a change of state?

Answer 22

thermal energy for a change of state = m x specific latent heat

Question 23

What is the formula for energy transferred in stretching?

Answer 23

energy transferred in stretching = 0.5 x spring constant x (extension)²

Question 24

What is the formula for force on a conductor in a magnetic field?

Answer 24

force on a conductor (at right angles to a magnetic field) carrying a current = magnetic flux density x current x length

Question 25

What is the relationship between primary and secondary coils?

Answer 25

potential difference across primary coil x current in primary coil = potential difference across secondary coil x current in secondary coil

Question 26

What is the relationship for turns in primary and secondary coils?

Answer 26

potential difference across primary coil ÷ potential difference across secondary coil = number of turns in primary coil ÷ number of turns in secondary coil

Question 27

What is the formula for gases relating pressure and volume?

Answer 27

for gases: pressure x volume = constant (for a given mass of gas and at a constant temperature)

Question 28

What is the formula for pressure due to a column of liquid?

Answer 28

pressure due to a column of liquid = height of column x density of liquid x g