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SingaporePhysics

Energy, Work and Power

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What are the different energy stores, and what does it mean to say energy is conserved?

Name the energy stores, describe energy transfers, and state the principle of conservation of energy
Name the main energy stores, describe how energy is transferred between them, state the principle of conservation of energy, and discuss efficiency and wasted energy at N(A)-Level.
7 min answer →

How do we calculate the energy of a moving object and of a raised object?

Use the formulas for kinetic energy and gravitational potential energy in simple situations
Use the kinetic energy formula and the gravitational potential energy formula, and apply conservation of energy to a falling object with simple N(A)-Level numbers.
8 min answer →

What does it mean to do work in physics, and how is power different from work?

Define work and power, and use work = force times distance and power = work divided by time
Define work done and power, use work = force times distance and power = work divided by time, and tell the difference between how much work is done and how fast it is done at N(A)-Level.
7 min answer →