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How to undo a wheel?

How to undo a wheel?

Force arm

How to increase the moment of a force?

Bike wheel

Force arm

Tightening a nut

Torque spanner

The moment of a force

The moment of a force

A see-saw

A see-saw

A see-saw

Equilibrium of the moments of forces

Equilibrium of the moments of forces

The moment of a force

The moment of a force