Physics Formulas

Question 1

Power (force and volumes)

Answer 1

P=Fv, watt

Question 2

Power (work and time)

Answer 2

P=W/t, watt

Question 3

Power (current and resistance)

Answer 3

I²R, watt

Question 4

Power (voltage and resistance)

Answer 4

V²/R, watt

Question 5

Power (charge and voltage)

Answer 5

QV/t, watt

Question 6

Frequency (unit)

Answer 6

1/T, Hz

Question 7

Average velocity

Answer 7

s/t, ms^-1

Question 8

Average acceleration

Answer 8

∆v/∆t, ms^-2

Question 9

Uniformly accelerated motion (v)

Answer 9

u+at

Question 10

Uniformly accelerated motion (s and a)

Answer 10

s=ut+1/2at²

Question 11

Uniformly accelerated motion (s and 1/2)

Answer 11

s=(u+v)/2 * t

Question 12

Uniformly accelerated motion (v and s)

Answer 12

v²=u²+2as

Question 13

Momentum (p)

Answer 13

mv (v is velocity), kgms^-2

Question 14

Conservation of linear momentum

Answer 14

maua + mbub = mava + mbvb, joules

Question 15

Elastic collision (kinetic energy)

Answer 15

1/2 maua² + 1/2 mbub² = 1/2 mava² + 1/2 mbvb², joules

Question 16

Inelastic collision

Answer 16

1/2 maua² + 1/2 mbub² > 1/2 mava² + 1/2 mbvb², joules

Question 17

Weight

Answer 17

mg, N

Question 18

Momentum & 2nd law of motion

Answer 18

F=(mv-mu)/t = ma

Rate of change of momentum is
equal to the net force applied

Question 19

Density (m and V)

Answer 19

m/V (V is volume), kgm^-3

Question 20

Pressure in fluids

Answer 20

rhogh ,pascal

Question 21

Pressure

Answer 21

F/A, N/m²

Question 22

Young’s Modulus

Answer 22

stress/strain or (F/A)/(x/L), N/m²

Question 23

Velocity of a wave

Answer 23

f*lambda, m/s

Question 24

Alpha decay

Answer 24

Proton 2, neutron 4

Question 25

Beta-decay

Answer 25

Proton -1, same neutron number

Question 26

Gamma decay

Answer 26

Only loss of energy

Question 27

Strain energy (Area under force-extension graph)

Answer 27

1/2kx², joules

Question 28

Potential divider

Answer 28

R2/(R1+R2) x V, voltage

Question 29

Power (current and voltage)

Answer 29

IV, watt

Question 30

Electric field intensity [between 2 parallel plates]

Answer 30

V/d, Vm^-1

Question 31

Charge (Quit) [Q]

Answer 31

It, couloumbs

Question 32

Efficiency

Answer 32

(Useful energy output/total energy output) x 100

Question 33

∆Work (external work done by expanding gas) from area under graph

Answer 33

p∆ܳV

Question 34

Torque

Answer 34

F*perpendicular d

Question 35

Voltage (work and q)

Answer 35

W/Q

Question 36

Resistance (resistivity)

Answer 36

(resistivity*L)/A

Question 37

Gee Xander, ultra violent nannies fighting my right

Answer 37

Gamma rays, X-rays, UV rays, visible light,

Question 38

Impulse (∆p)

Answer 38

Ft

Question 39

Phase difference

Answer 39

amount of wave (1/2, 3,4) x 360

Question 40

Path difference

Answer 40

amount of wave x lambda

Question 41

Diffraction grating

Answer 41

lambda = slit width * fringe width / distance of slit to fringe or lambda = ax/D