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Newtonian Mechanics
Quick questions on Work, energy and power explained: H2 Physics Newtonian Mechanics
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is work done by a force?Show answer
Work is done when a force moves its point of application. For a constant force and displacement at angle between them:
What is the work-energy theorem?Show answer
The net work done on a body equals its change in kinetic energy:
What is conservation of energy?Show answer
Energy cannot be created or destroyed, only transferred. For a system with only conservative forces (gravity), mechanical energy is conserved:
What is q1?Show answer
Define work done by a force and state the condition under which a force does no work. [2 marks]
What is q2?Show answer
A ball is dropped from . Using energy conservation, find its speed just before hitting the ground (ignore air resistance). [2 marks]
What is q3?Show answer
A motor lifts a load at constant speed . The motor draws . Find its efficiency.
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