Vector Fundamentals Notes

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By: Nahdir Austin Honors Physics Period 2

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Presentation transcript:

Vector Fundamentals Notes

Vector and Direction A vector quantity is a quantity which is fully described by both magnitude and direction. Examples of vector quantities include displacement, velocity, acceleration, and force.

Vector Diagrams Characteristics of an appropriately drawn vector diagram. a scale is clearly listed a vector arrow (with arrowhead) is drawn in a specified direction. The vector arrow has a head and a tail. the magnitude and direction of the vector is clearly labeled.

Vector Addition Vectors in the same direction can simply be added together

Vector Addition Now what?

Pythagorean Theorem Method The Pythagorean theorem is a useful method for determining the result of adding two (and only two) vectors which make a right angle to each other.

Practice Eric leaves the base camp and hikes 11 km, north and then hikes 11 km east. Determine Eric's resulting displacement.

Trigonometric Method SOH CAH TOA

Practice Eric leaves the base camp and hikes 11 km, north and then hikes 11 km east. Determine Eric's resulting direction relative to the start.

Head-to-Tail Method Using a scaled diagram to determine the vector sum or resultant.

Practice Add the vectors: 20 m, 45 deg. + 25 m, 300 deg. + 15 m, 210 deg. SCALE: 1 cm = 5 m

Practice The head-to-tail method is employed as described above and the resultant is determined. The magnitude and direction is labeled on the diagram.

Interestingly enough, the order in which three vectors are added has no affect upon either the magnitude nor the direction of the resultant. The resultant will still have the same magnitude and direction.