Physics

Question 1

What is the formula for average speed?

Answer 1

Average speed (ms-1) = distance (m) / time (s)

Question 2

What is the formula for average velocity?

Answer 2

Average velocity (ms-1) = displacement (m) / time (s)

Question 3

What is the formula for the period of a pendulum?

Answer 3

Period of a pendulum (s) = total time (s) / number of swings

Question 4

How do you calculate acceleration?

Answer 4

Acceleration (ms-2) = (final velocity (ms-1) - initial velocity (ms-1)) / time (s)

Question 5

What is the formula for weight?

Answer 5

Weight (N) = mass (kg) × gravitational field strength (ms-2)

Question 6

What is Earth’s gravitational field strength?

Answer 6

Earth’s gravitational field strength = 10 ms-2

Question 7

How is force calculated?

Answer 7

Force (N) = mass (kg) × acceleration (ms-2)

Question 8

What is the formula for density?

Answer 8

Density (kgm-3) = mass (kg) / volume (m3)

Question 9

State Hooke’s law.

Answer 9

Hooke’s law: Force (N) = constant (Nm-1) × extension (m)

Question 10

What is the formula for pressure?

Answer 10

Pressure (Pa) = force (N) / area (m2)

Question 11

What is fluid pressure?

Answer 11

Fluid Pressure (Pa) = density (kgm-3) × gravitational field strength (ms-2) × height (m)

Question 12

How do you calculate work done?

Answer 12

Work (J) = force (N) × distance moved (m)

Question 13

What is the formula for power?

Answer 13

Power (W) = work (J) / time (s)

Question 14

What is the formula for kinetic energy?

Answer 14

Kinetic Energy (J) = ½ × mass (kg) × velocity² (ms-1)

Question 15

What is the formula for gravitational potential energy?

Answer 15

Gravitational potential energy (J) = mass (kg) × gravitational field strength (ms-2) × height (m)

Question 16

How is efficiency calculated in terms of power?

Answer 16

Efficiency (%) = (useful power output (W) / total power input (W)) × 100

Question 17

How is efficiency calculated in terms of energy?

Answer 17

Efficiency (%) = (useful energy output (J) / total energy input (J)) × 100

Question 18

What is the formula for moment?

Answer 18

Moment (Nm) = force (N) × perpendicular distance from pivot (m)

Question 19

What is the principle of moments?

Answer 19

Sum of clockwise moments (Nm) = sum of anticlockwise moments (Nm)

Question 20

How do you calculate momentum?

Answer 20

Momentum (kgms-1) = mass (kg) × velocity (ms-1)

Question 21

What is the formula relating force to change in momentum?

Answer 21

Force (N) = change in momentum (kgms-1) / time (s)

Question 22

What is impulse?

Answer 22

Impulse (kgms-1) = change in momentum (kgms-1)

Question 23

What is centripetal force?

Answer 23

Centripetal Force (N) = mass (kg) × velocity² (ms-1) / radius (m)

Question 24

What is the formula for orbital period?

Answer 24

Orbital Period (s) = 2 × π × radius (m) / velocity (ms-1)

Question 25

State Boyle’s Law.

Answer 25

Pressure1 (Pa) × Volume1 (m3) = Pressure2 (Pa) × Volume2 (m3)

Question 26

What is the formula for energy in thermal processes?

Answer 26

Energy (J) = mass (kg) × specific heat capacity (Jkg-1°C-1) × temperature change (°C)

Question 27

What is thermal capacity?

Answer 27

Thermal capacity (J°C-1) = mass (kg) × specific heat capacity (Jkg-1°C-1)

Question 28

What is the formula for energy transferred in latent heat?

Answer 28

Energy transferred (J) = mass (kg) × specific latent heat (Jkg-1)

Question 29

What is the formula for expansion?

Answer 29

Expansion (m) = linear expansivity (°C-1) × original length (m) × temperature rise (°C)

Question 30

What is the formula for current?

Answer 30

Current (A) = charge (C) / time (s)

Question 31

What is voltage?

Answer 31

Voltage (V) = energy transferred (J) / charge (C)

Question 32

What is the relationship between voltage, current, and resistance?

Answer 32

Voltage (V) = current (A) × resistance (Ω)

Question 33

What is the formula for power in electrical circuits?

Answer 33

Power (W) = current (A) × voltage (V)

Question 34

What is the formula for energy transferred in electrical systems?

Answer 34

Energy transferred (J) = current (A) × voltage (V) × time (s)

Question 35

How do you calculate total resistance in series?

Answer 35

Total Resistance (Ω) = sum of individual resistors (Ω)

Question 36

What is the formula for total resistance in parallel?

Answer 36

1 / total resistance (Ω) = sum of individual resistors (Ω)

Question 37

What is the formula for resistance?

Answer 37

Resistance (Ω) = resistivity (Ωm) × length (m) / area (m2)

Question 38

What is the formula for transformers regarding voltage?

Answer 38

Voltage in secondary coil (V) = (turns on secondary coil / turns on primary coil) × voltage in primary coil (V)

Question 39

What is the formula for wave speed?

Answer 39

Wave speed (ms-1) = frequency (Hz) × wavelength (m)

Question 40

What is the relationship between frequency and period?

Answer 40

Frequency (Hz) = 1 / Period (s)

Question 41

What is the formula for refractive index in terms of angles?

Answer 41

Refractive index = sine of the angle of incidence (i) / sine of the angle of refraction (r)

Question 42

What is the formula for refractive index in terms of light speed?

Answer 42

Refractive index = speed of light in vacuum / speed of light in material

Question 43

What is the formula for refractive index in terms of critical angle?

Answer 43

Refractive index = 1 / sine of critical angle