Vector & Scalar Quantities

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Presentation transcript:

Vector & Scalar Quantities

Characteristics of a Scalar Quantity Only has magnitude (size) Requires 2 things: 1. A value 2. Appropriate units Ex. Mass: 5kg Temp: 21° C Volume: 5 cm3 Speed: 65 mph Distance: 10 m Time: 11:30 am Mass: 14 kg

Characteristics of a Vector Quantity Has magnitude (size) & direction Requires 3 things: 1. A value 2. Appropriate units 3. A direction! Ex. Acceleration: 9.8 m/s2 down (Gravity) Velocity: 25 mph West Force: 16 N up Momentum: 45 kgm/s forward Weight: 160 N down Displacement: 20 miles east

Scalar or Vector? a. 5 m b. 30 m/sec, East c. 5 mi., North d. 20 degrees Celsius e. 256 bytes f. 4000 mph, Northeast

More about Vectors A vector is represented on paper by an arrow 1. the length represents magnitude 2. the arrow faces the direction of motion 3. a vector can be “picked up” and moved on the paper as long as the length and direction its pointing does not change