Equations

What’s the formula and unit for stress?

Stress (Nm²) = force (N) / cross sectional area (m²)

Whats the formula and unit for strain?

Strain (no unit) = extension OR change in length / original length (percentage)

What’s the formula for young’s modulus?

• Stress (Nm²) / strain

What’s the formula and units for the area of a square/rectangle?

• Length x width

• (unit)²

What’s the formula and units for the area of a triangle?

• ½ x base x height

• (unit)²

What’s the formula for the area of a circle?

pi x r²

What’s the formula for volume?

Cross sectional area x height

What’s the formula for cuboids?

Cross sectional area x height

What’s the formula for prisms?

1/3 x cross sectional area x height

What’s the formula for density?

Mass / volume

What’s the formula for mechanical advantage

Mechanical advantage = load (Fb) / effort (Fa)

What’s the formula for Factor of Safety

Factor of Safety = yield stress / load