Equations

Question 1

W, weight (N, newtons)

Answer 1

m, mass (Kg) × g, gravitational field strength (N/Kg)

Question 2

W, work done (J, Joules)

Answer 2

F, force (newtons) × s, distance (along line of action of the force)

Question 3

F, force applied to a spring

Answer 3

k, spring constant × e, extension

Question 4

M, moment of a force

Answer 4

F, force × d, distance (normal to direction of force)

Question 5

p, pressure

Answer 5

A, area of that surface

Question 6

s, distance travelled

Answer 6

v, speed × t, time

Question 7

a, acceleration

Answer 7

t, time taken

Question 8

F, resultant force

Answer 8

m, mass × a, acceleration

Question 9

p, momentum

Answer 9

m, mass × v, velocity

Question 10

KE, kinetic energy

Answer 10

0.5 × m, mass × (v, speed)²

Question 11

Ep gravitational potential energy

Answer 11

m, mass × g, gravitational field strength × h, height

Question 12

P, power

Answer 12

t,time

Question 13

P, power

Answer 13

t, time

Question 14

Efficiency

Answer 14

total

Question 15

v, wave speed

Answer 15

ƒ, frequency × wavelength

Question 16

Q, charge flow

Answer 16

I, current t,time

Question 17

V, potential difference

Answer 17

I, current × R, resistance

Question 18

P, power

Answer 18

V, potential difference × I, currrent

Question 19

P, power

Answer 19

(I, current)² × R, resistance

Question 20

E, energy transferred

Answer 20

P, power × t, time

Question 21

E, energy transferred

Answer 21

Q, charge flow × V, potential difference

Question 22

density

Answer 22

V, volume

Question 23

p, pressure due to a column of liquid

Answer 23

h,height of column × density of liquid ×g, gravitational field strength

Question 24

(v, final velocity)² - (u, initial velocity)²

Answer 24

2 × a, acceleration × s, distance

Question 25

Ee, elastic potential energy

Answer 25

0.5 × k, spring constant × (e, extention)²

Question 26

F, force

Answer 26

m▲v, change in momentum ----------------------------------------- ▲t, time taken

Question 27

▲E, change in thermal energy

Answer 27

m,mass × c, specific heat capacity × ▲ø, temperature change

Question 28

period

Answer 28

1 ------- frequency

Question 29

magnification

Answer 29

image height --------------------- object height

Question 30

F, force on a conductor (at right angles to a magnetic field) carrying current

Answer 30

, magnetic flux density × I, current ×l, length

Question 31

Vp, potential difference across primary coil -------------------------------------------------------------- Vs, potential difference accorss secondary coil

Answer 31

np, number of turns in primary coil --------------------------------------------------- ns,m number of turns in secondary coil

Question 32

Vs, pot. difference acroos primary coil × Is, current in primary coil

Answer 32

Vp, pot difference in secondary coil × Ip, current in primary coil

Question 33

for gasses: | p, pressure × V volume

Answer 33

constant