How do simple machines help us do work?

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Presentation transcript:

How do simple machines help us do work?

WORK: exertion or effort directed to produce or accomplish something; labor; toil (definition from dictionary.com) Something that makes you tired (basically everything you do including breathing, unless you are completely still and frozen solid).

Lever: Description: a stiff bar that rests on a fulcrum How it helps us work: lifts or moves a load Examples: seesaw, shovel, crowbar

Can you think of any other examples of levers?

Inclined plane: Description: is a flat surface with one end raised higher than the other How it helps us work: moves things up and down Examples: slide, ramp, mountain road

Can you think of any other examples of inclined planes?

Wheel and axle: Description: a wheel with a rod called an axle through the center…axle and wheel move together. How it helps us work: lifts or moves a load Examples: doorknob, pencil sharpener, bike wheel

Can you think of any other examples of wheels and axles?

Screw: Description: an inclined plane wrapped around a rod or cylinder How it helps us work: holds things together Examples: drill bit, spiral staircase, screw-on-lid

Can you think of any other examples of screws?

Pulley: Description: a grooved wheel with a rope around it. How it helps us work: moves things up, down, or across Examples: flag pole, curtain rod, sailboat mast

Can you think of any other examples of pulleys?

Wedge: Description: two inclined planes put together, creating one sharp edge How it helps us work: cuts or spreads an object apart Examples: knife, wood chisel, needle

Can you think of any other examples of wedges?

Two questions to see how much you’ve learned? 1. How are an inclined plane and a wedge alike? How are they different? 2. How are a screw and a wheel and axle alike? How are they different?