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

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.)

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

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 pair of meshed gears A and B have radii 0.10 m and 0.40 m respectively. If a force of 10 N is applied tangentially at A’s rim, what tangential force appears at B’s rim (neglecting losses)?

Which class of lever has the load between the pivot and effort?

Which of these is an example of a first-class lever?

A wrench has two possible positions to apply a 50 N force: at 0.10 m or at 0.30 m from the nut. What is the ratio of the moments produced at the two positions (moment at 0.30 m : moment at 0.10 m)?

Which lever class typically sacrifices force to gain speed and range of movement (effort between load and pivot)?

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

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?

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?