Forces And Motion: Units
Overview
Physics problems fall apart when the units are wrong. A speed given in kilometres per hour cannot be plugged straight into an equation that expects metres per second, and a force stated without its unit is just a number. Knowing which unit belongs to which quantity is the first step in every calculation.
This reference covers the nine SI and derived units you need for the Forces and motion section of the Edexcel specification: kilogram, metre, metre per second, metre per second squared, newton, second, newton per kilogram, newton metre, and kilogram metre per second. You will practise recalling them quickly and converting between related forms.
Objectives
- Use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and newton/kilogram (N/kg)
- Use the following units: newton metre (Nm), kilogram metre/second (kg m/s)
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Forces And Motion: 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.
- What is the SI unit of force? A) kg B) m/s C) N D) J Answer: C
- Which unit measures gravitational field strength? A) N B) N/kg C) kg m/s D) m/s2 Answer: B
- Momentum is measured in: A) N m B) kg m/s2 C) kg m/s D) N/kg Answer: C
- A speed of 90 km/h is equivalent to: A) 9 m/s B) 25 m/s C) 90 m/s D) 250 m/s Answer: B
- The moment of a force is measured in: A) N B) N/kg C) N m D) kg m/s Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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