Moments, Levers And Gears (physics Only) (GCSE Physics)

What are the SI units of a moment (turning effect)?

A gear ratio is often defined using tooth counts. If driver has 20 teeth and driven has 5 teeth, what is the torque and speed relationship (driven : driver)?

A uniform beam 4.0 m long is pivoted at one end and supports a 200 N weight at the far end. What moment about the pivot does the weight produce?

Two identical gears A and C are connected by an intermediate gear B (an idler). How does the presence of the idler affect the overall gear ratio between A and C?

A seesaw is balanced when a 20 kg child sits 1.5 m from the pivot on one side. At what distance must a 30 kg child sit on the other side to balance the seesaw? (Take g constant and cancel where appropriate.)

Which equation gives the moment (M) of a force about a pivot?

A force of 10 N is applied at a perpendicular distance of 0.40 m from a pivot. What is the moment (turning effect) of this force about the pivot?

When two gears mesh, the tangential force at the teeth is transmitted from one to the other. If driver gear torque is 2.0 N m and its radius is 0.05 m, what is the tangential force at the teeth?

A simple calculation: a child pushes down on a see-saw 0.8 m from the pivot with a moment of 24 N m. What force did the child apply?

A 150 N force produces a clockwise moment of 300 N m about a pivot. What is the perpendicular distance from the pivot to the line of action of the force?

A wheelbarrow provides a mechanical advantage because: