Physics: Forces And Motion: Units
Overview
Every calculation in forces and motion relies on choosing the right units. Using metres when the question gives centimetres, or forgetting that acceleration is measured in metres per second squared, can cost easy marks on the exam.
This reference covers the seven SI units you need for the forces and motion section of the Edexcel specification: kilogram, metre, metre per second, metre per second squared, newton, second and newton per kilogram.
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)
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Physics: 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.
- The SI unit of force is: A) kilogram B) metre per second C) newton D) joule Answer: C
- What is 72 km/h in m/s? A) 7.2 m/s B) 20 m/s C) 72 m/s D) 259.2 m/s Answer: B
- Acceleration is measured in: A) m/s B) m/s2 C) N/kg D) kg m/s Answer: B
- Which quantity is measured in N/kg? A) Weight B) Momentum C) Gravitational field strength D) Pressure Answer: C
- How many seconds are in 2.5 minutes? A) 25 s B) 120 s C) 150 s D) 250 s Answer: C
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