Equations

Question 1

Density

Answer 1

P=m/v

Question 2

Acceleration

Answer 2

Final velocity- initial velocity
—————————————
Time

Question 3

Relative Gravitational Potential energy

Answer 3

Mgh

Question 4

Frequency

Answer 4

Velocity/ wavelength

Question 5

Hooke’s law

Answer 5

Spring force= -spring constant x spring stretch or compression

Question 6

Percentage uncertainty

Answer 6

+- absolute uncertainty
——————————. x100
Actual reading

Question 7

Newtons second law

Answer 7

F=m x a

Question 8

Surface pressure equation

Answer 8

Pressure = Force / area

Question 9

Pressure of a fluid at depth

Answer 9

d x g x p (depth x gravitational field strength x density of fluid

Question 10

Volume of cylinder

Answer 10

h x 3.14159 x r^2

Question 11

Stokes law

Answer 11

Resistive frictional force = 6 x 3.14 x coefficient of viscosity x radius of ball bearing x velocity of ball bearing

Question 12

kinetic energy =

Answer 12

𝐸k = 0.5𝑚 𝑣^2
Kinetic energy=0.5 × mass × (speed)2

Question 13

elastic potential energy =

Answer 13

𝐸e = 0.5 k e^2
elastic potential energy = 0.5 × spring constant × (extension)2

Question 14

gravitational potential energy equation

Answer 14

mass × gravitational field strength × height
Ep= mgh

Question 15

Change in thermal energy equation

Answer 15

Mass x specific heat capacity x temperature change

ΔE = m c Δθ

Question 16

Power equation

Answer 16

Energy transferred/ time
P= E/t

Question 17

Work done equation

Answer 17

Wd= P x t
Work done= power x time
Work done=force x distance

Question 18

Efficiency equations

Answer 18

Useful output energy transfer.
Useful power output
——————————————- x 100
Total input energy transfer.
Total power input