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.)

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?

A spanner (wrench) handle is 0.30 m long. Applying 80 N at the end produces the same moment as applying which force at 0.60 m?

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)?

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

A wheelbarrow provides a mechanical advantage because:

A small gear (pinion) drives a larger gear; which of the following is true about torque and speed on the larger gear compared with the pinion?

A driver gear has radius 0.05 m and the force at its rim is 12 N. What torque does it apply to the axle?

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

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?

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?