1. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 1Autumn Quarter Springs and Levers Lab 3

2. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 2Autumn Quarter Types of Springs Compression Tension Torsion

3. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 3Autumn Quarter 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. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 4Autumn Quarter Application

5. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 5Autumn Quarter Springs: Examples Valve spring of a car engine Door return spring Weighing machines Spring-driven clocks, mouse traps

6. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 6Autumn Quarter Other Forms of Springs Rubber bands Bunjy cords Other elastic cords

7. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 7Autumn Quarter 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. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 8Autumn Quarter Levers: Principle Effort x Distance effort = load x Distance load

9. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 9Autumn Quarter Levers: Classification First class Second class Third class

10. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 10Autumn Quarter 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. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 11Autumn Quarter First Class

12. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 12Autumn Quarter Second-class Levers Fulcrum at one end of the bar and effort at the other end Magnifies force and reduces distance Examples: wheel barrow, bottle opener, nutcrackers

13. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 13Autumn Quarter Second Class

14. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 14Autumn Quarter 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. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 15Autumn Quarter Third Class

16. Engineering H191 - Drafting / CAD Gateway Engineering Education Coalition Lab 3P. 16Autumn Quarter Questions ?