Physics: Energy Resources And Energy Transfers: Units
Overview
Energy is the currency of physics, and like any currency it needs a unit before the numbers mean anything. The energy section leans on eight of them, and they are not eight unrelated facts: each one is built from the others in a way that you can reconstruct rather than memorise.
This lesson sets out the kilogram, joule, metre, metre per second, metre per second squared, newton, second and watt. You will see how the joule grows out of the newton, how the watt grows out of the joule, and how tracking units through a calculation catches a wrong answer before the examiner does.
Objectives
- Use the following units: kilogram (kg), joule (J), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and watt (W)
Mind map
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Flashcards
Quick recall practice on the facts this topic is tested on.
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Physics: Energy Resources And Energy Transfers: Units. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The SI unit of energy is the: A) newton B) watt C) joule D) kilogram Answer: C
- One watt is equal to: A) 1 joule B) 1 joule per second C) 1 newton metre D) 1 newton per second Answer: B
- Which of these has no unit? A) Power B) Work done C) Efficiency D) Weight Answer: C
- A force of 20 N moves an object 4 m in the direction of the force. The work done is: A) 5 J B) 16 J C) 24 J D) 80 J Answer: D
- 3.0 kW expressed in watts is: A) 3 W B) 30 W C) 300 W D) 3000 W Answer: D
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Practice Mock Questions
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