Equations

Question 1

Speed(m/s)

Answer 1

Distance(m)
/
Time(s)

Question 2

Weight(N)

Answer 2

Mass(kg) x Gravitational Field Strength(N/kg)

Question 3

Efficiency (2)

Answer 3

Total useful energy transferred(J)
/
Total energy transferred (J)

OR

Total useful power output(J)
/
Total power output(J)

Question 4

Work Done(J)

Answer 4

Force(N) x Distance(m)

Question 5

Force applied to a spring(N)

Answer 5

Spring constant(N/m) x extension(m)

Question 6

Moment of a force(Nm)

Answer 6

Force(N) x Distance(m)

Question 7

Pressure(N/m)

Answer 7

Force applied(N)
/
Surface area(m² )

Question 8

Acceleration(m/s² )

Answer 8

Change in velocity(m/s)
/
Time taken(s)

Question 9

Resultant Force(N)

Answer 9

Mass(kg) x Acceleration(m/s² )

Question 10

Momentum(kgm/s)

Answer 10

Mass(kg) x Velocity(m/s)

Question 11

Kinetic energy(J)

Answer 11

0.5 x mass x (speed)²

Question 12

Gravitational Potential Energy(J)

Answer 12

Mass(kg) x Gravitational field strength(N/kg) x height(m)

Question 13

Power(W) (4)

Answer 13

1) Energy Transferred / Time taken
2) Work Done / Time taken
3) Potential difference x Current
4) (current)² x Resistance

Question 14

Wave Speed(m/s)

Answer 14

Frequency(Hz) x Wavelength(m)

Question 15

Charge Flow(C)

Answer 15

Current(A) x Time(s)

Question 16

Potential Difference(V)

Answer 16

Current(A) x Resistance(Ohms)

Question 17

Energy Transferred(J) (2)

Answer 17

1) Power(W) x Time(s)

OR

2) Charge Flow(C) x Potential difference(V)

Question 18

Density(Kg/m^3)

Answer 18

Mass(kg) / Volume(m^3)