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# Mechanical Equilibrium acloutier copyright 2011

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Conceptual Physics Mechanical Equilibrium

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### Mechanical Equilibrium acloutier copyright 2011

1. 1. Mechanical Equilibriumby Annie Cloutier 2011 copyright<br />
2. 2. The sum of the forces equals zero<br />
3. 3. Static or Dynamicequilibrium<br />The box is definitely in static equilibrium<br />the puppy seems to be in<br /> static equilibrium<br /><ul><li>the plane is in dynamic equilibrium</li></li></ul><li>PE -Potential energy KE - Kinetic energypick the right photograph for each<br />
4. 4. Resultant is the sum of two or more vectors<br />Vector is the arrow that represents the magnitude and direction of a quantity<br />Force is an example of vector quantity<br />TENSION <br />is a push or pull<br />Stretching is tension<br />FORCE<br />Gravity ‘s force is measured in newton’s as weight<br />
5. 5. Scalar Quantity is a quantity that can be described by magnitude only and has no direction<br />Time<br />Area<br />Volume<br />= scalar quantity<br />
6. 6. Parallelogram Rule<br />parallelogram law n. <br />a rule for finding the resultant of two vectors by constructing a parallelogram, each pair of parallel sides of which represents the magnitude to scale, and the direction and sense of the given vectors; its diagonal then represents the direction and magnitude of the resultant. A parallelogram of forces is a diagram in which the combined effect of two forces acting on the same body is determined using this rule. For example, if the two forces are represented by the vectors and in the figure below, then their resultant, to the same scale, is , where R completes the parallelogram.<br />
7. 7. Some students demonstrategravity’s effect on a rope <br />
8. 8. Your physics LAB activity: Make a small loop at the ends of the ropeHave your partner hold the ends of the loops on their fingersHold the rope and hang the weight of one physics bars in the centerChange the position of the weightChange the angle of the rope to increase the angle;next, decrease the angle<br /><ul><li>Rope about a meter long (100 cm)
9. 9. One weight of 1 - 2 newtons
10. 10. *newton = N
11. 11. measure the gravity force on an object in an environment, your on Earth, gravity is different on Mars or the Moon)</li></li></ul><li>Record your steps and the observations of the cause and effects of the force of gravity and tension(s).Describe the results.Make a line drawing of the two extreme results in the activity.<br />
12. 12. Future physics’ student thinking about hanging vectors, the force of gravity ,the parallelogram rule and resultants<br />
13. 13. the end<br />