Equations in M2 (some of them!)

Buoyancy force ( 2 correct answers)

• Gravity X depth in fluid

• Equal to weight of fluid displaced by an object

• volume of object x density of fluid

Calculating the moment of a force

• Force x perpendicular distance from fulcrum

• Mass x acceleration due to gravity

• time to turn x angle turned through

• distance between 2 forces

Formula for pressure due to a force

• Pressure = push - pull

• Pressure = force x area

For a force(F) causing a mass(m) to accelerate(a), the relationship between F, m and a is:

• m = Fa

• F= ma

• a = Fm

How can Stress be calculated

• Stress = force x time

• Stress = extension x force

To calculate Strain

• extension x original length

• force x distance

Young's Modulus is calculated by:

• Stress x strain

• distance / time

• mass x acceleration

Which is correct?

• absolute pressure = gauge pressure + atmospheric pressure

• absolute pressure = gauge pressure - atmospheric pressure

To calculate density

• Density = weight x time

Mechanical power (select 2 correct answers)

• Power is the rate of doing work

• Power =

  distance x acceleration