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Lab 3 P. 1

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Springs and Levers Lab 3 Types of Springs Compression Tension Torsion Forms of Springs and Applications Coil and bending bar Applications To return something to its ... – PowerPoint PPT presentation

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Title: Lab 3 P. 1


1
Springs and Levers
  • Lab 3

2
Types of Springs
  • Compression
  • Tension
  • Torsion

3
Forms of Springs and Applications
  • Coil and bending bar
  • Applications
  • To return something to its original position
  • To measure force
  • To store energy (potential)

4
Application
5
Springs Examples
  • Valve spring of a car engine
  • Door return spring
  • Weighing machines
  • Spring-driven clocks, mouse traps

6
Other Forms of Springs
  • Rubber bands
  • Bunjy cords
  • Other elastic cords

7
Spring Constant
  • To hold a spring either stretched or compressed
    an amount X from its normal length requires a
    force that is directly proportional to X.
  • F k x k spring constant.
  • It is a measure of the stiffness of a particular
    spring.

8
Levers Principle
  • Effort x Distanceeffort load x Distanceload

9
Levers Classification
  • First class
  • Second class
  • Third class

10
First-class Levers
  • Fulcrum is placed between load and effort
  • If fulcrum at center effort load
  • If fulcrum is twice as far from the fulcrum to
    the load effort load/2
  • Examples balance, nail extractor, hand cart,
    pliers, scissors

11
First Class
12
Second-class Levers
  • Fulcrum at one end of the bar and load at the
    other end
  • Magnifies force and reduces distance
  • Examples wheel barrow, bottle opener, nutcrackers

13
Second Class
14
Third Class Levers
  • Fulcrum at one end of the bar and load at the
    other end
  • Magnifies distance but reduces force!
  • Examples hammer, fishing rod, tweezers

15
Third Class
16
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