1 / 27

Work and Machines

Section 3: Simple Machines. Work and Machines. Learning Goals. Describe the six types of simple machines. Explain how the different types of simple machines make work easier. Calculate mechanical advantage. Lever.

ryu
Download Presentation

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. Section 3: Simple Machines Work and Machines

  2. Learning Goals • Describe the six types of simple machines. • Explain how the different types of simple machines make work easier. • Calculate mechanical advantage.

  3. Lever • A lever is a rigid bar that rotates around a fixed point called the fulcrum. • The bar may be either independent or attached to another object.

  4. Lever • In use, a lever has both an effort force and a resistance force.

  5. Lever • Examples: • See-saw • Screwdriver • Wheel barrow • Baseball Bat

  6. Pulley • A pulley consists of a wheel that turns freely in a frame called a block.

  7. Pulley • A pulley can be used to change the direction of a force or to increase input force depending on how the pulley is arranged.

  8. Fixed Pulley • Fixed Pulley: changes the direction of a force; however it does not create a mechanical advantage. • Example: Elevator

  9. Moveable Pulley • A single mechanical pulley creates a mechanical advantage; however it does not change the direction of a force.

  10. Moveable Pulley • The mechanical advantage of a moveable pulley is equal to the ropes that support the moveable pulley.

  11. Wheel and Axle • The wheel and axle is a simple machine consisting of a larger wheel rigidly secured to a smaller wheel or shaft, called an axle.

  12. Wheel and Axle • When either the wheel or axle turns, the other rotates with it.One full revolution of either part causes one full revolution of the other part.

  13. Wheel and Axle • Examples: • Pencil sharpener • Door knob • Faucet handles

  14. Inclined Plane • An inclined plane is a sloping surface that reduces the amount of force required to do work. • The inclined plane makes it easier to move a weight from a low height to a high height.

  15. Inclined Plane • The mechanical advantage of an inclined plane is equal to the length of a slope divided by the height of the slope.

  16. Wedge • The wedge is an inclined plane that moves through objects. • It has one or two sloping sides.

  17. Wedge • Wedges change the direction of the force. • Examples: • Knife/ax • Door stopper

  18. Screw • The screw is also an inclined plane wrapped in a spiral around a post. • The threads form a tiny ramp that run upward from its end.

  19. Screw • Example: • Many types of lids

  20. Compound Machines • Two or more simple machines operating together.

More Related