1 / 9

Work and Machines

Learn how machines facilitate work by altering forces and distances, making tasks easier. Discover examples showcasing how machines increase or decrease forces and distances, as well as change force directions. Delve into the workings of input and output forces and distances to understand the mechanics of work. Explore how machines minimize the effort needed for work tasks, increasing overall efficiency.

wattan
Télécharger la présentation

Work and 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. Work and Machines How machines make our lives easier

  2. Machines • A machine is a device that changes a force • Machines make work easier to do • Machines change the size of the force needed, the direction of the force, or the distance over which a force acts • Example a lug wrench and jack allow a person to change a car tire

  3. Increasing Force • A small force exerted over a large distance becomes a large force over a short distance • Example a jack lifts a car a small bit at a time but the distance the jack moves is large

  4. Increasing Force • If a machine increases the distance traveled then it lessens the force required • Example moving books one at a time takes less force but requires more distance than moving the whole stack at once

  5. Increasing Distance • A machine may decrease the distance the force moves but increases the force required • Example is a crew team rowing a boat • Each oar pull is short but the distance the boat moves is long, the distance is shorter and the force needs to be greater

  6. Changing Direction • Machines can also change the direction of the force • For example, when pulling on an oar, one end of the oar goes in the opposite direction • This has changed the direction of the force

  7. Work Input • The force you input on a machine is called input force • The distance the input force acts through is known as the input distance • The work done by the input force acting through the input distance is called the work input • The work input equals the input force times the input distance (think: work = force x distance)

  8. Work Output • The force exerted by a machine is the output force • The distance the output force is exerted is the output distance • The work output is the output force times the output distance

  9. Work Input and Work Output • Output and input work are nearly equal • The output work will be less • All machines need to use input work to overcome friction

More Related