Work and Power

Overview

This lesson should connect the equations to real examples of transfer over time.

What You Need to Know

• Link work done directly to the energy-store language from the previous lesson.
• Use W = Fd for straightforward cases where a force moves an object through a distance.
• Keep time visible in every power example so the rate idea stays clear.
• Compare situations where the same amount of work is done in different times to make power feel meaningful.
• Use the unit watt consistently when discussing power.

How to Work Through It

1. Start with a retrieval task on energy transfers from the previous lesson.
2. Work through work done as energy transferred by a force and practise W = Fd.
3. Introduce power through rate comparisons and use simple P = W / t or P = E / t examples.
4. Finish with mixed questions that compare work and power in real processes.

Check Your Understanding

• Can you explain whether two people doing the same work in different times have done the same work and the same power.
• Use a hinge question where you decide whether a situation changes work done, power, or both.
• Try one short work calculation and one short power calculation with units.

Common Mistakes

• Assuming high power means more total work. Keep rate and total transfer clearly separated.
• Some forget that distance in W = Fd must be in the direction of the force in the simple model being used here.
• Power problems are often weakened by time-unit errors, especially minutes versus seconds.

Next Steps

• Use the question resource to reinforce the distinction between work, energy, and power.
• Carry the transfer ideas into kinetic and gravitational potential energy.