Physics: Astrophysics: Units
Overview
The astrophysics section shares its units with forces and motion because orbital calculations use the same mechanics. Speed, distance, time, mass, force and gravitational field strength all carry the same SI units you have already met.
This reference lists the seven units for the astrophysics section and highlights the enormous scales involved when applying them to planets, stars and galaxies.
Objectives
- Use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s), newton/kilogram (N/kg)
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Physics: Astrophysics: 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.
- Gravitational field strength is measured in: A) m/s B) N/kg C) kg/m3 D) Pa Answer: B
- How many seconds are in one day? A) 3600 B) 36000 C) 86400 D) 8640 Answer: C
- The orbital speed equation is: A) v = rT B) v = 2 pi r / T C) v = T / 2 pi r D) v = r / T Answer: B
- The mass of a planet would be measured in: A) Newtons B) Pascals C) Kilograms D) Joules Answer: C
- Which is the correct conversion? A) 1 year = 3.16 x 10^5 s B) 1 year = 3.16 x 10^7 s C) 1 year = 3.16 x 10^9 s D) 1 year = 3.16 x 10^6 s Answer: B
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.
Practice Mock Questions
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