1 / 6

Machines

Machines. Mechanical Advantage & Efficiency. Mechanical Advantage. 3m. 1m. F E = ??. F L = 30 N. * Using the law of levers to solve. ∴ The effort force required is 3 times less!. Consider the following first class lever, what force is required for static eqm ?.

eadoin
Télécharger la présentation

Machines

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. Machines Mechanical Advantage & Efficiency

  2. Mechanical Advantage 3m 1m FE= ?? FL = 30 N * Using the law of levers to solve. ∴ The effort force required is 3 times less! Consider the following first class lever, what force is required for static eqm?

  3. In general, using the law of levers: • We have two ratios in the equation which tell us about mechanical advantages: * Rearranging for ratios Actual Mechanical Advantage Ideal Mechanical Advantage

  4. Why two advantages? • Most machines have friction due to moving parts so they are not ideal. • IMAs can be modified to suit the machine. • IMAs of Other machines:

  5. Efficiency of Machines The ratio of AMA to the IMA of a machine expressed as a percentage:

  6. Eg.1:Consider ateeter-totter with a load of 100N at a distance of 40cm and an effort force of 50N at a distance of 80cm. Calculate • The AMA & IMA • The %eff • Eg.2: A 25-N cart is pulled 2m up a ramp with an effort force of 6N parallel to the ramp raising the cart 0.6m above its initial level. • The AMA & IMA • The %eff of the ramp.

More Related