All Equations

Question 1

Weight

Answer 1

Weight = mass x grav field strength

Question 2

Work done

Answer 2

Work done = force x distance
W = F x s

Question 3

Force applied to a spring

Answer 3

Force applied to a spring = spring constant x extension

F(N) = k(N/m) x e(m)

Question 4

Distance travelled

Answer 4

distance travelled = speed x time
s(m) = v(m/s) x t(s)

Question 5

Acceleration

Answer 5

acceleration = change in velocity/time taken

Question 6

Resultant force

Answer 6

Resultant force = mass x acceleration
F(N) = m(kg) x a(m/s2)

Question 7

Momentum

Answer 7

Momentum = mass x velocity
p(kgm/s) = m(kg) x v(m/s)

Question 8

Kinetic energy

Answer 8

Kinetic energy = 0.5 x mass x speed
E(kj) = m(kg) x v(m/s2)

Question 9

Gravatational potential energy

Answer 9

Gravatational potential energy = mass x gravitational field strength x height

Ep(J) = m(kg) x g(N/kg) x h(m)

Question 10

Power(energy transferred)

Answer 10

Power = energy transferred/time
P = E/t

Question 11

Power(work done)

Answer 11

Power = work done / time
P = W/t

Question 12

Efficiency(energy transfer)

Answer 12

Efficiency = useful output energy transfer/total input transfer

Question 13

Efficiency(power)

Answer 13

Efficiency = useful power output/total power output

Question 14

Wave speed

Answer 14

Wave speed(m/s)= frequency(Hz)x wavelength(m)

Question 15

Charge flow

Answer 15

Charge flow(C) = current(A) x time(s)

Question 16

Potential difference

Answer 16

= current x resistance
V = I x R

Question 17

Power (potential difference)

Answer 17

Power = potential difference x current
P(W) = V x I(A)

Question 18

Power(current)

Answer 18

Power = (current)2 x resistance
P = I x R

Question 19

Energy transferred(transfer red power)

Answer 19

Energy transferred(J) = power(W)x time(s)
E= P x t

Question 20

Energy transferred (tranferred charge flow)

Answer 20

energy transferred(J) = charge flow(C) x potential difference(v)

E = Q x V

Question 21

Density

Answer 21

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