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

A force is applied to a lever at an angle such that only a component perpendicular to the lever causes turning. If a 30 N force is applied at 60° to the lever, what perpendicular component produces the moment?

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?

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?

Which one of these will NOT change the moment produced by a force about a pivot?

Gear A with 10 teeth drives gear B with 40 teeth. If gear A rotates at 200 rpm, what is the rotational speed of gear B?

When two gears mesh directly (single pair), how does the direction of rotation of the driven gear compare with the driver?

Which change will increase the moment produced by a force applied to a lever?

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.)

If power transmission through gears is ideal (no losses), which quantity remains the same in the driver and driven shafts?

A gear train: driver gear with 12 teeth drives gear with 36 teeth, which drives a final gear with 6 teeth meshed with the 36-tooth. If the driver rotates at 120 rpm, what is the speed of the final gear?

A lever is in equilibrium. If an extra 10 N force is applied at 0.5 m on the effort side clockwise, how must the other side change to remain balanced?