Physics

Question 1

Average speed =

Answer 1

Distance / Time
V= d/t

Question 2

Acceleration = ….

Answer 2

Acceleration = change in velocity / time taken for change
a= v-u /t

Question 3

Force =

Answer 3

Force = mass X acceleration
F= mXA

Question 4

Weight =

Answer 4

Weight = mass X gravitational field strength
W=mXg

Question 5

Momentum =

Answer 5

Momentum = mass X Velocity
p=mv

Question 6

Force =

Answer 6

Force = change in momentum / time
f= (mv-mu) /t

Question 7

Orbital speed =

Answer 7

Orbital speed = 2 X Pi X orbital Radius / time period

Question 8

Sum of clockwise moments =

Answer 8

Sum of clockwise moments = sum of anticlockwise moments

Question 9

Work done =

Answer 9

Work done = force X distance moved in direction of force

W = F X d

Question 10

Power =

Answer 10

Power = work done / time taken
P= W / t

Question 11

Change in gravitational potential energy =

Answer 11

Change in gravitational potential energy = weight X change in vertical height
GPE = mgh

Question 12

Kinetic energy =

Answer 12

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

Ke= 1/2mv^2

Question 13

Efficiency =

Answer 13

Efficiency = useful energy out / total energy supplied in

Efficiently = useful energy / total energy

Question 14

Total energy before event =

Answer 14

Total energy before event = Total energy after event ( conservation of energy)

Question 15

Charge =

Answer 15

Charge = current X time
Q=It

Question 16

Voltage =

Answer 16

Voltage = current X resistance

V= IR

Question 17

Power =

Answer 17

Voltage X current

Question 18

Electrical energy =

Answer 18

Electrical energy = voltage X current X time

E= I t V

Question 19

Voltage across coil =

Answer 19

Voltage across coil = number of turns on coil

Vs= Ns

Question 20

Secondary coil output power =

Answer 20

Secondary coil output power = primary coil output power

Question 21

Wave velocity =

Answer 21

Wave velocity = frequency X Wavelength

V = f X weird y

Question 22

Frequency =

Answer 22

Frequency = 1 / time period

Question 23

Refractive index =

Answer 23

Refractive index = sine of angle of incidence / sine of angle of refraction
n= sin i/ sin r

Question 24

Sine of critical angle =

Answer 24

Sine of critical angle = 1/refractive index
Sin c = 1/n

Question 25

Density =

Answer 25

Density = mass/volume
P= m/V

Question 26

Pressure =

Answer 26

Pressure = Force / area
p= F/A

Question 27

Pressure in liquid =

Answer 27

Pressure in liquid = liquid density X height of liquid X gravity

Question 28

What’s Boyles law?

Answer 28

First pressure X first Volume = second pressure X second volume

Question 29

What’s the pressure law ?

Answer 29

First pressure / first kelvin temperature = second pressure / second kelvin temperature

Question 30

Stopping distance =

Answer 30

Stopping distance = thinking distance ➗ breaking distance