Understanding Scalar and Vector Quantities in Physics
Learn about scalar and vector quantities in physics, understand the difference between them with examples, and explore the units for speed, mass, weight, force, and distance. Dive into drawing scale diagrams for representing vector quantities and enhance your knowledge in physics concepts.
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Presentation Transcript
CwK Tuesday, 29 April 2025 Scalar and Vector Quantities Do Now Activity What are the units for Speed Mass Weight Force Distance
Progress Indicators Good Progress Identify quantities as either scalar or vector Define scalar and vector quantities Outstanding Progress Draw scale diagrams to represent a vector quantity
Word Consciousness Scalar-size but no direction Vector- size and direction Magnitude- size
Scalar A scalar quantity has size but no direction We also use the word magnitude for size Examples include Speed Distance Time Mass energy power
Vector A vector quantity has both magnitude and direction Example include Acceleration Force Weight Velocity displacement
Representing Vector Quantities Using arrows Arrow direction shows direction Length of arrow shows the magnitude
Scale diagrams When more than one force acts on an object, the forces sometimes need to be shown on a scale diagram. For example: two forces of 3.0N and 4.0 N act at right angles to each other We need to show the forces on a scale diagram
Scale diagrams We can use the scale 10mm=1N Draw the scale diagram Object 3.0N 4.0N
Task 1. Draw the following to scale a) Two forces of 8.5N and 13N act at right angles to each other b)A parachutist with air resistance of 20N and weight of 9.8N c) A car has forward force of 5N, drag of 3N, gravity of 9.8N and upthrust of 9.8N 2.Describe scalar and vector quantities, you must include some examples of both and use the word magnitude in your description.
Plenary 1. What is a scalar quantity? 2. What is a vector quantity? 3. Which of the following are scalar quantities? power, velocity, force, mass, distance
