1 / 6

AP Unit I C 4 Power

AP Unit I C 4 Power. 4. Students should understand the definition of power, so they can:

Download Presentation

AP Unit I C 4 Power

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. AP Unit I C 4 Power

  2. 4. Students should understand the definition of power, so they can: • A) Calculate the power required to maintain the motion of an object with constant acceleration(e.g., to move an object along a level surface, to raise an object at a constant rate, or to overcome friction for an object that is moving at constant speed).

  3. B) Calculate the work performed by a force that supplies constant power, or the average power supplied by a force that performs a specified amount of work.

  4. Power • Power is the rate of doing work. • Power = Work Done/ TimeTaken • P = W/t or P avg = W / Δt • Power is measured in Joules per second or Watts ( J/s or W)

  5. Power and Velocity • Since P = W/t and W = F d cos θ then • P = (F d cos θ)/t • Since d/t = v then • P = F v cos θ

  6. Power Calculations • 1. A crane lifts a mass of 555 kg at 2.5 m/s. Calculate (a) power and (b) tension in rope. • If it rises to a height of 25 meters, calculate time taken and work done. • 2. If the rope snaps, with what speed will it hit the ground. • If it penetrates to a depth of 0.25 meters calculate the force exerted by the ground on the block.

More Related