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Title:

Simple Machines

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Simple Machines Revised ... crowbar, baseball bat, rake Inclined Plane a slanted surface to ... have few or no moving parts Lever made of a board or bar ... – PowerPoint PPT presentation

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Title: Simple Machines


1
Simple Machines
  • Revised Edited by
  • Tracy Sikes

2
Machine a tool that helps us do work
  • Machines help us by
  • Changing the amount of force on an object.
  • Changing the direction of the force.

3
Force is a push or pull that changes the motion
or shape of an object.
  • Example I push a bookshelf to move it.

4
Energy is the ability to do work.
  • Example I must have energy to run the mile.

5
Work is the result of force moving an object.
  • Example Picking up something heavy is hard work!

6
Gravity
  • Gravity is the force that constantly pulls
    objects toward Earth.

7
Simple machines have few or no moving parts
  • Lever
  • Inclined Plane
  • Wedge
  • Screw
  • Wheel and Axle
  • Pulley

8
Lever made of a board or bar set on top of a
fulcrum. It is used to lift weight
  • Example seesaw, crowbar, baseball bat, rake

9
Inclined Plane a slanted surface to make
lifting easier
  • Example ramp, stairs

10
Wedge two inclined planes together used to
raise an object or split an object.
  • Example knife, door wedge, ax

11
Screw an inclined plane wrapped around a pole
or shaft that is used to hold materials together
or drill holes.
  • Example drill bit, screws

12
Wheel and Axle a wheel that turns on a post to
help move things quickly and easily
  • Example steering wheel, doorknob, screwdriver

13
Pulley made of rope and string wound around a
reel to change the direction of a force.
  • Example flagpole, clothesline, cranes, fishing
    reel

14
Compound Machine two or more simple machines
working together.
  • Examples
  • Bike
  • Car

15
How Work is Done
  • Energy Force Function
  • Work is done!
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