PHYS1001 Lecture Notes - Lecture 2: Negative Number
Lecture 2- scalars, vectors, physical quantities
Scalars
• Something that has magnitude
• Any quantitative
• E.g. distance, speed, time, weather forecast (temperature)
Vectors
• Something that has magnitude and direction- two qualities that define a vector
• E.g. displacement, velocity, acceleration, fluid flow rate, light propagation
• Does not point at something points on a direction
• Magnitude represented by length of arrow
• Magnitude (vector length) can be calculated using Pythagoras
• Angles can be found using Pythagoras
• A vector multiplied by a number (a scalar), it’s magnitude multiplied by that
number
◦ If you multiply by a negative number you change its direction as well
◦ 3D vectors
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