Moments, levers and gears (physics only) Revision - AQA Physics 8463

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Moments and turning effects (physics only)10 objectives

(Physics only) Define moment as the turning effect of a force.
(Physics only) Use the equation moment of a force = force x perpendicular distance from the pivot.
(Physics only) Calculate moment from force and perpendicular distance.
(Physics only) Calculate force from moment and perpendicular distance.
(Physics only) Calculate perpendicular distance from moment and force.
(Physics only) State that moment is measured in newton metres.
(Physics only) Distinguish clockwise moments from anticlockwise moments.
(Physics only) Explain that increasing force increases the moment for a fixed distance.
(Physics only) Explain that increasing perpendicular distance increases the moment for a fixed force.
(Physics only) Apply MS 3b and MS 3c skills when rearranging the moment equation.

Levers and gears (physics only)10 objectives

(Physics only) Describe a lever as a simple machine that rotates about a pivot.
(Physics only) Explain how a lever can increase the moment produced by a force.
(Physics only) Explain why a longer lever arm can reduce the force needed for the same moment.
(Physics only) Describe gears as toothed wheels that transmit turning effects.
(Physics only) Explain that gears can change the size of a force or the speed of rotation.
(Physics only) Identify input gear and output gear in simple gear diagrams.
(Physics only) Describe how a larger gear driven by a smaller gear changes rotation speed and turning effect.
(Physics only) Describe how a smaller gear driven by a larger gear changes rotation speed and turning effect.
(Physics only) Apply moment reasoning to simple lever and gear examples.
(Physics only) Distinguish force multiplication from energy creation in lever and gear explanations.

momentpivotperpendicular distancenewton metreclockwise momentleverlever armgearinput gearoutput gearturning effect

Understand the Concept of Moment: Use the named force or motion quantity when you define moment as the turning effect of a force and remember that it is measured in newton metres. Link your answer to Moments and turning effects (physics only) and keep moment and force separate.
Understand the Moment Equation: Use the named force or motion quantity when you memorize the moment equation: Moment = Force x Perpendicular Distance from the Pivot. Link your answer to Moments and turning effects (physics only) and keep distance and displacement separate.

Misunderstanding Moment Definition: Remember that moment is specifically defined as the turning effect of a force, which depends on both the force applied and the distance from the pivot point.
Misunderstanding Moment Calculation: To fix this, always remember that the moment is calculated using the formula: moment = force x perpendicular distance from the pivot. Ensure you identify the correct values for force and distance before substituting them into the equation.

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