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Chapter overview
Moments, equilibrium, machines, work, energy, power, and conservation of energy.
Practice ready
11906 MCQs and 7771 written prompts are ready for focused chapter work.
Topics
7
Recall
21
Cards
42
Topic 1
The moment of a force depends on the force applied and the perpendicular distance from the pivot.
Topic 2
A body stays in equilibrium when forces and turning effects balance, and its centre of gravity acts as the point wh...
Topic 3
Uniform circular motion has constant speed but changing direction, so the velocity keeps changing.
Topic 4
Work transfers energy, and power tells how quickly that work is done.
Topic 5
Levers and pulleys help us change the magnitude or direction of force to make work easier.
Topic 6
Mechanical advantage compares load with effort, velocity ratio compares distances moved, and efficiency compares us...
Topic 7
Energy cannot be created or destroyed; it only changes from one form to another.
Chapter pack
Topic list
Topic 1
Understand moment of force, clockwise and anticlockwise moments, and simple numerical applications.
Topic 2
Study conditions of equilibrium, centre of gravity, stability, and everyday examples.
Topic 3
Explain circular motion, changing direction, centripetal force, and common examples.
Topic 4
Use definitions, formulae, units, and relationships among work, energy, force, and power.
Topic 5
Compare levers, single fixed pulleys, single movable pulleys, and block and tackle systems.
Topic 6
Calculate mechanical advantage, velocity ratio, efficiency, and practical machine losses.
Topic 7
Apply the principle of conservation of energy to conversions between common energy forms.
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