SI Units and Vectors Explained

SI Units ,[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Diameter of a nucleus: 1x 10 -14 m Diameter of an atom: 1x 10 -10 m Length of an average cell: 1x 10 -5 m Length of a car: 4 m Football Field: 9x 10 1 m Avg. distance of the earth to the moon: 3.84x 10 8 m Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

SI Units ,[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Electron: 9.1x 10 -31 kg Mosquitoe: 1x 10 -5 kg Human: 1x 10 2 kg Elephant: 5x 10 3 kg Earth: 5.98x 10 24 kg Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

SI Units ,[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Duration of a nuclear collision: 1x 10 -22 s Reaction time of humans: 2x 10 -1 s Time difference between 1 st and 2 nd position at indycar race: 1.4 s (difference in price money: $650 000) 1 year: 3.2x 10 7 s Calculated age of the universe: 5x 10 17 s Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Unit Conversions ,[object Object],[object Object],[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Types of Quantities ,[object Object],[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences No. of seats Distance travelled Speed Height Length Temperature All these quantities just have a magnitude - Scalars Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Types of Quantities ,[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Speed in a particular direction ‘ Distance’ covered from a certain point Air friction against motion of car Velocity Drag Force Displacement The above quantities, together with a magnitude, act or have acted in a specific direction. Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Scalars vs. Vectors Physics 131 - Physics for Health, Life and Environmental Sciences ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Vectors Physics 131 - Physics for Health, Life and Environmental Sciences ,[object Object],[object Object],[object Object],[object Object],y-axis z-axis x-axis Each axis has a basic vector from which all others can be constructed: Basis Vectors x axis, i vector: (1,0,0) z axis, k vector: (0,0,1) y axis, j vector: (0,1,0) | i | = | j | = | k | = 1 Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Vectors Physics 131 - Physics for Health, Life and Environmental Sciences Vectors by convention always start at the origin The yellow vector, r , can be written as the sum of all the smaller base vectors: r = 2 i + 3 j + 6 k = (2,3,6) ,[object Object],[object Object],[object Object],[object Object],Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Vectors Physics 131 - Physics for Health, Life and Environmental Sciences To calculate the magnitude of a vector, one uses Pythagoras: Construct the vector, R = (x,y): R = (3,9) R = (-2,4) R = 6 i -1 j What is the magnitude and direction of each vector? x R y Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Components of Vectors Physics 131 - Physics for Health, Life and Environmental Sciences To calculate the components of a vector, one uses trig rules: x = R cos θ y = R sin θ x R y θ Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

Mathematics of Vectors ,[object Object],[object Object],[object Object],[object Object],Physics 131 - Physics for Health, Life and Environmental Sciences Abdul Mirza CENTRE FOR QUANTUM TECHNOLOGY, SCHOOL OF PHYSICS, UKZN

SI Units and Vectors Explained

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Ähnlich wie SI Units and Vectors Explained

Ähnlich wie SI Units and Vectors Explained (20)

Mehr von Ramasubbu .P

Mehr von Ramasubbu .P (20)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

SI Units and Vectors Explained