equations

Question 1

equation for work done and units

Answer 1

W = Fxs work done = force x distance
work done = joules
s = m
force = N

Question 2

equation for kinetic energy

Answer 2

Ke = 1/2mvsquared
kinetic energy = 1/2xmassx(speed)squared
mass = kg
speed/velocity = m/s
kinetic energy = J

Question 3

equation for gravitational energy

Answer 3

gravitational energy = mass x gravitational field strength x height
Ep = mgh
Ep = J
mass = kg
g = N/Kg
h = m

Question 4

equation for power

Answer 4

power = work done/time or energy/time
P = W/t
P = E/t
power = watt
energy transferred - J
time - s
work done = j

Question 5

efficiency equation

Answer 5

efficiency = useful output/input
Eff = out/in

Question 6

charge equation

Answer 6

charge = current x time
Q = Ixt
charge - coulombs - c
time - s
I - current in amperes - A

Question 7

potential difference equation

Answer 7

potential difference = current x resistance
V = IR
v - volts
i - Amperes
R = ohms

Question 8

power equation w potential difference

Answer 8

power = potential difference x current
P = VI
V = volts
I = current - amperes

Question 9

power equation w resistance

Answer 9

power = (current)squared x resistance
P = Isquared x R
r = ohms

Question 10

equation for energy transferred

Answer 10

energy transferred = charge flow x potential difference
E = 1V
e on top then 1 and v on bottom

Question 11

density equation

Answer 11

density = mass/volume
D = m/v
m on top then d on left v on right bottom