Conceptual Physics Mechanical Equilibrium

1. Mechanical Equilibriumby Annie Cloutier 2011 copyright

2. The sum of the forces equals zero

4. Resultant is the sum of two or more vectors Vector is the arrow that represents the magnitude and direction of a quantity Force is an example of vector quantity TENSION is a push or pull Stretching is tension FORCE Gravity ‘s force is measured in newton’s as weight

5. Scalar Quantity is a quantity that can be described by magnitude only and has no direction Time Area Volume = scalar quantity

6. Parallelogram Rule parallelogram law n. 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.

7. Some students demonstrategravity’s effect on a rope

9. One weight of 1 - 2 newtons

10. *newton = N

12. Future physics’ student thinking about hanging vectors, the force of gravity ,the parallelogram rule and resultants

13. the end