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Introduces work and shows calculations of the work done in several situations.

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- 1. Preview Section 1 Work Section 2 Energy Section 3 Conservation of Energy Section 4 PowerMr. Thompsons Physics Class
- 2. What do you think? List five examples of things you have done in the last year that you would consider work. Based on these examples, how do you define work?Mr. Thompsons Physics Class
- 3. Workthe force (F) times the In physics, work is the magnitude of magnitude of the displacement (d) in the same direction as the force. W = Fd What are the SI units for work? − Force units (N) x distance units (m) − N•m are also called joules (J). How much work is 1 joule? − Lift an apple weighing about 1 N from the floor to the desk, a distance of about 1 m.Mr. Thompsons Physics Class
- 4. Workthe force (F) times the In physics, work is the magnitude of magnitude of the displacement (d) in the same direction as the force. W = Fd What are the SI units for work? − Force units (N) x distance units (m) − N•m are also called joules (J). How much work is 1 joule? − Lift an apple weighing about 1 N from the floor to the desk, a distance of about 1 m.Mr. Thompsons Physics Class
- 5. Work and Energy Section 1 Work • Pushing this car is work because F and d are in the same direction. • Why aren’t the following tasks considered work? – A student holds a heavy chair at arm’s length for several minutes. – A student carries a bucket of water along a horizontal path while walking at a constant velocity.Mr. Thompsons Physics Class © Houghton Mifflin Harcourt Publishing Company
- 6. Work and Energy Section 1 Work How would you calculate the work in this case? What is the component of F in the direction of d? • F cos – If the angle is 90°, what is the component of F in the direction of d? • F cos 90° = 0 – If the angle is 0°, what is the component of F in the direction of d? • F cos 0° = FMr. Thompsons Physics Class © Houghton Mifflin Harcourt Publishing Company
- 7. WorkMr. Thompsons Physics Class
- 8. Work is a ScalarWork can be positive or negative but does not have a direction. What is the angle between F and d in each case?Mr. Thompsons Physics Class
- 9. Classroom Practice Problem A 20.0 kg suitcase is raised 3.0 m above a platform. How much work is done on the suitcase? Answer: 5.9 x 102 J or 590 JMr. Thompsons Physics Class
- 10. Now what do you think? Based on the physics definition, list five examples of things you have done in the last year that you would consider work.Mr. Thompsons Physics Class

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