Equations

Question 1

Force, Pressure, Area

Answer 1

Pressure (N/m2) = Force (N) / Area (m2)

Question 2

Time, Acceleration, Velocity 1, Velocity 2

Answer 2

a (m/s2) = (v-u) m/s
—-
t (s)

Question 3

Acceleration, Force, Mass

Answer 3

Force (N) = mass (g) x acceleration (m/s2)

Question 4

Speed, Time, Distance

Answer 4

Speed (m/s) = Distance (m) / Time (s)

Question 5

Momentum, Mass, Velocity

Answer 5

Momentum (kg m/s) = mass (kg) x velocity (m/s)

Question 6

Final momentum, Initial momentum, Impulse

Answer 6

Impulse= final mo (kg m/s) - initial mo (kg m/s)

Question 7

Power, Work done, Time

Answer 7

Power (W) = Work done (J) / Time (s)

Question 8

Frequency, Time period

Answer 8

Frequency (Hz) = 1 / Time period (s)

Question 9

Pressure 1, Pressure 2, Time 1, Time 2

Answer 9

Pressure 1 (Pa) / Time 1 (s) = Pressure 2 (N/m2) / Time 2 (s)

Question 10

Pressure 1, Pressure 2, Volume 1, Volume 2

Answer 10

p1 (Pa) x V1 (m3) = p2 (N/m2) x V2 (m3)

Question 11

Mass, Volume, Density

Answer 11

Density (kg/m3) = mass (kg) / Volume (m3)

Question 12

Force, Work done, Distance

Answer 12

Work done (Nm) = Force (N) x Distance (m)

Question 13

Mass, Gravity, Weight

Answer 13

Weight (N) = mass (g) x gravity (N/g or m/s2)

Question 14

Gravitational Potential Energy, Mass, Gravity, Height

Answer 14

Ep (J) = mass (kg) x gravity (N/kg) x height (m)

Question 15

Kinetic Energy, Velocity, Mass

Answer 15

Ek (J) = mass (kg) x velocity2 (m/s)
—————————
2

Question 16

Force, Moment, Distance (from pivot)

Answer 16

Moment (Nm) = Force (N) x Distance (m)

Question 17

Current, Time, Charge

Answer 17

Charge (Coulombs) = Current (A) x Time (s)

Question 18

Current, Voltage, Resistance

Answer 18

Voltage (V) = Current (A) x Resistance (Ohms Ω)

Question 19

Current, Voltage, Power

Answer 19

Power (W) = Current (A) x Voltage (V)

Question 20

Frequency, Wave speed, Wavelength

Answer 20

Frequency (Hz) = Wavespeed (m/s)
————–
Wavelength (m)

Question 21

Primary voltage, Primary current, Secondary no of coils, Secondary current, Primary no. of coils, Secondary voltage

Answer 21

Vp Np Is
— = —- = —-
Vs Ns Ip

Volts # Amps

Question 22

Refractive index, Angle of incidence, Angle of refraction

Answer 22

Refractive index = sin (angle of incidence) / sin (angle of refraction)

Question 23

Critical angle, Refractive index

Answer 23

Refractive index = 1 / sin (critical angle)

Question 24

Pressure difference, Height, Density of medium, Gravity

Answer 24

Pressure (Pa) = Height (m) x Density (kg/m3) x Gravity (N/kg)

Question 25

Voltage, Current, Time, Energy

Answer 25

Energy (J) = Voltage (V) x Current (A) x Time (s)