Physics

Question 1

how to calculate kinetic energy?

Answer 1

kinetic energy = 0.5 X mass X (speed X speed)

Question 2

how to calculate elastic potential energy?

Answer 2

elastic potential energy = 0.5 X spring constant (extension X extension)

Question 3

how to calculate gravitational potential energy?

Answer 3

gravitational potential = mass X gravitational field strength X height

Question 4

how to calculate change in thermal energy?

Answer 4

change in thermal energy = mass X specific heat capacity X temperature change

Question 5

how to calculate power?

Answer 5

power = energy transferred / time

Question 6

how to calculate power?

Answer 6

power = work done / time

Question 7

how to calculate efficiency?

Answer 7

efficiency = useful output energy transfer / total input energy transfer

Question 8

how to calculate efficiency?

Answer 8

efficiency = useful power output / total power output

Question 9

how to calculate charge flow?

Answer 9

charge flow = current X time

Question 10

how to calculate potential difference?

Answer 10

potential difference = current X resistance

Question 11

how to calculate power?

Answer 11

power = potential difference X current

Question 12

how to calculate power?

Answer 12

power = (current X current) X resistance

Question 13

how to calculate energy transferred?

Answer 13

energy transferred = charge flow X potential difference

Question 14

how to calculate density?

Answer 14

density = mass / volume

Question 15

how to calculate thermal energy for change of state?

Answer 15

thermal energy for change of state = mass X specific latent heat

Question 16

how to calculate constant for gases?

Answer 16

For gases:
pressure X volume = constant

Question 17

how to calculate weight?

Answer 17

weight = mass X gravitational field strength

Question 18

how to calculate work done?

Answer 18

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

Question 19

how to calculate force?

Answer 19

force = spring constant X extension

Question 20

how to calculate moment of a force?

Answer 20

moment of a force = force X distance (normal to direction of force)

Question 21

how to calculate pressure?

Answer 21

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

Question 22

how to calculate pressure due to a column of liquid?

Answer 22

pressure due to column of liquid = height X density X gravitational field strength

Question 23

how to calculate distance travelled?

Answer 23

distance travelled = speed X time

Question 24

how to calculate acceleration?

Answer 24

acceleration = change in velocity / time taken

Question 25

how to calculate final velocity^2 - velocity ^2

Answer 25

(final velocity)^2 - (initial velocity)^2 = 2 X acceleration X distance

Question 26

how to calculate resultant force?

Answer 26

resultant force = mass X acceleration

Question 27

how to calculate momentum?

Answer 27

momentum = mass X velocity

Question 28

how to calculate force?

Answer 28

force = change in momentum / time taken

Question 29

how to calculate period?

Answer 29

period = 1 / frequency

Question 30

how to calculate wave speed?

Answer 30

wave speed = frequency X wavelength

Question 31

how to calculate magnification?

Answer 31

magnification = image height / object height

Question 32

how to calculate force on a conductor?

Answer 32

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

Question 33

what two values are equal (involving turns of a coil)?

Answer 33

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

Question 34

what two values are equal (involving current in a coil)?

Answer 34

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

Question 35

how to calculate energy transferred?

Answer 35

energy transferred = power X time