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Simple Machines

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Simple Machines Simple Machines Machines are tools that make jobs easier by: Changing the size of the force Changing the direction of the force Increasing the speed ... – PowerPoint PPT presentation

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Title: Simple Machines


1
Simple Machines
2
Simple Machines
  • Machines are tools that make jobs easier by
  • Changing the size of the force
  • Changing the direction of the force
  • Increasing the speed or distance the object is
    moved

3
Simple Machines
  • Inclined plane
  • Wedge
  • Screw

4
Simple Machines
  • Lever
  • Pulley

Wheel Axle
5
Mechanical Advantage
  • MA is the number of times a machine multiplies
    the force being applied
  • Ideal mechanical advantage (IMA) is the number of
    times the applied force is multiplied under ideal
    conditions. This assumes no friction!

6
Mechanical Advantage
  • Actual mechanical advantage (AMA) is the number
    of times the applied force is multiplied under
    real conditions

7
Calculating IMA
  •  

8
Calculating IMA
For a ramp 10m long and 2m high
 
  • dEramp length10m

dR ramp Height2m
9
Calculating AMA
  •  

10
Calculating AMA
  •  

11
Efficiency
  •  

12
Efficiency
  •  

13
Word Problems
  • RTDQ Read the darn question!
  • What is the question asking me to find?
  • What information do I have in the problem? Draw a
    picture!
  • If I dont have enough information, is it a
    two-step problem?
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