1 / 26

Work

Work. Mechanical work. Applying a force on an object that displaces the object in the direction of the force. W = F Δ d Only when the magnitude of the force is constant. Scalar (no direction associated with work) SI unit: N•m When force and displacement are in the same direction!. N•m.

watson
Download Presentation

Work

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Work

  2. Mechanical work • Applying a force on an object that displaces the object in the direction of the force

  3. W = FΔd • Only when the magnitude of the force is constant. • Scalar (no direction associated with work) • SI unit: N•m • When force and displacement are in the same direction!

  4. N•m • Also called the Joule for James Prescott Joule, who studied work, energy, and heat • 1 N•m = 1 J

  5. Work is only done when force and displacement are in the same direction! • If a force is applied on the object but the object doesn’t move, no work is done

  6. activity • Go around the room and explain in your notes why each of the situations presented is either an example where work is done or no work is done.

  7. example

  8. Example 2 • A curler applies 15.0 N on a stone. The stone accelerates from rest to 8.00 m/s in 3.50 s. How much mechanical work is done?

  9. Example 2 • A curler applies 15.0 N on a stone. The stone accelerates from rest to 8.00 m/s in 3.50 s. How much mechanical work is done?

  10. What if force and displacement are in different directions? • When would this happen?

  11. Fv does no work on the suitcase, because the suitcase isn’t displaced in the vertical direction! This is the only force that causes the suitcase to move horizontally (same direction as the displacement

  12. Prove it!

  13. Example with vacuuming

  14. Positive and negative work • Most objects have several forces acting on them at one time. • Total work = sum of work done by all the forces acting on an object

  15. We assume forces act in the same direction as the displacement, or in the opposite direction of the displacement:

  16. sample • A shopper pushes a shopping cart on a horizontal surface with a horizontal applied force for 41.0 N for 11.0 m. The cart experiences a force of friction of 35.0 N. Calculate the total mechanical work done on the shopping cart.

  17. sample • A shopper pushes a shopping cart on a horizontal surface with a horizontal applied force for 41.0 N for 11.0 m. The cart experiences a force of friction of 35.0 N. Calculate the total mechanical work done on the shopping cart.

  18. Both Fa and Ff do work on the cart • Fa acts in the same direction as the cart’s displacement, and Ff acts in the opposite direction

  19. We will solve this problem in 3 parts a. Calculate work done by the applied force

  20. b. Calculate the work done by the force of friction

  21. c. Calculate the total, or net, work done on the cart by calculating the sum of Wa and Wf

More Related