1 / 8

and

Work. and. Power. WORK. WORK. DISTANCE. FORCE. Work is defined as the product of the applied force and the displacement through which that force is exerted. W=F x d W=F(cos θ ) d. Remember…. 9.8 m/s 2. F= m x a !!!. Try These.

maisie-barnett
Télécharger la présentation

and

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 and Power

  2. WORK WORK DISTANCE FORCE Work is defined as the product of the applied force and the displacement through which that force is exerted. W=F x d W=F(cosθ)d

  3. Remember… 9.8 m/s2 F= m x a !!!

  4. Try These... How much work is done lifting a 3N cabbage 2 meters into the air? 6 N·m (or joules) How much work is done by holding it there for 5 seconds? none (why?)

  5. *NOTE Work is only done on an object when it is moved (displaced). In addition, work is only done when the object is moved in the direction of the force. Though work must be done on your muscles to hold it there, we are talking about work done on the object.

  6. POWER Power is defined as work done divided by the time used to do the work. P = F(cosθ)d t P = F x d t

  7. The SI unit for power is the joule/sec (or watt). A machine is capable of a power output of 1,000 watts. How far can it lift a 50N weight in 3 seconds? Problem HINT: Solve formula for “d” = 60 meters

  8. putting it all together... How much work is done holding a 1,200 N piano at shoulder height for 15 minutes (your shoulder is 1.5m above the ground)? NONE What if we lifted the piano 1m over that time? 1,200 J How much power was exerted? 1.3 Watts

More Related