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KinematicsF2013-Ave+[Compatibility+Mode]

KinematicsF2013-Ave+[Compatibility+Mode] - Kinematics...

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1 Kinematics Locomotion Chapter 2 Concepts: Position & Displacement Velocity & Speed Acceleration Motion in one Dimension Free Fall Physiological Detection of Acceleration PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion What is motion? •Mo t ion is a change o f pos i t w i th t ime . PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion A child skipping down alley. Can we analyze its motion? ht p:/ www.imagekind.com/child-skipping-down-al ey-art?IMID=642437f1-365b-4f63-988f-a5e712155344 PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion A protein is folding. Can we analyze its motion?
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2 PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion These images of a bird in flight show the bird’s position as a function of time. The bird’s flight! Q: What kind of motion can you verify for this bird’s flight? PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion What kind of motion can you verify for this bird’s flight? The bird’s flight! A: PHYS 1L03, Fal 2013, McMaster University, R. Nejat Motion •In any mo t ion , we dea l w i th : –Where is the object? •Pos it –How far has the object moved from where is was? •D isp lacement –How fast is the motion? •Ve loc ity –Is the motion getting faster or slower? •Acce lerat PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional (1D) Motion i t –refers to an object location relative to some origin or reference point. •The po s i t o f the ba l l i s different in these two coordinate systems with two different origins. 0 x 1 1234 x 2 0 12 3 4
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3 PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional (1D) Motion •Pos i t ion (a vec to r ) –an object location relative to some origin or reference point, shown as a vector. 0 x 1 1234 x G x 2 012 -1 -2 x G PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional Motion •Vec r and Sca la r quan t i ty : r : is a quantity that has both a magnitude and a direction. –Position is a vectorquantity. •Sca r : is a quantity with no direction. –The mass of an object is a scalar quantity. PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional Motion •D isp lacemen t r ) –refers to the change in an object’s position i f x x x G G G ± ' 0 x x i x f i x G f x G i f x x x G G G ± ' 0 x x f x i f x G i x G i f x x x G G G ± ' PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional Motion Distance: e s c r i b e s t h e l e n g t h b e tw e e n o l o c a t i o n s m e a s u r e d along the actual path used to connect them. Displacement vs. Distance: •T h e m a g n i t u d e o f d i s p l a c ement of an object is not the same as the distance it travels. Example:
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4 PHYS 1L03, Fal 2013, McMaster University, R. Nejat One-Dimensional (1D) Motion •One D imens iona l (1D ) mo t ion can be described by scalars (real numbers with units) as functions of time. –e.g. x(t) •The s ign (pos i t ive o r nega t ) keeps track of direction.
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KinematicsF2013-Ave+[Compatibility+Mode] - Kinematics...

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