Sprinter-L-Avenue

Sprinter-L-Avenue - Sprinter Biomechanics Biomechanics...

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1 PHYS 1L03, Winter 2009, McMaster University, R.Nejat Sprinter Biomechanics Forces, Newton’s laws Concepts: Force Newton’s laws Free body diagram Equilibrium Chapter: 3, 4 Pages: 40-70, 103-105 PHYS 1L03, Winter 2009, McMaster University, R.Nejat Biomechanics • Sprinters require maximum acceleration. PHYS 1L03, Winter 2009, McMaster University, R.Nejat Biomechanics • How does a sprinter accelerate? • Does the push exerted by the sprinter on the starting block directly give him acceleration? • How does a sprinter exert a push (a force)? • What is force and what do forces do? PHYS 1L03, Winter 2009, McMaster University, R.Nejat Biomechanics • How does a sprinter exert a force? • How do we exert forces? • What is force and what do forces do? Questions: PHYS 1L03, Winter 2009, McMaster University, R.Nejat • Forces: What is force? What do forces do? Physics PHYS 1L03, Winter 2009, McMaster University, R.Nejat • Force is: –a push or a pull that one object exerts on another object –a vector: having both magnitude and direction • When you apply a force, , on an object, the object applies force, , on you at the same time with the same magnitude but opposite direction. Force F r F r

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2 PHYS 1L03, Winter 2009, McMaster University, R.Nejat Force on an object A mule and a cart: – A mule applies a force on a cart, and the cart applies a force with the same magnitude but in opposite direction on the mule. PHYS 1L03, Winter 2009, McMaster University, R.Nejat What is going on in this picture? Force PHYS 1L03, Winter 2009, McMaster University, R.Nejat • When you kick a ball, your foot exerts a force on the ball while the two are in contact 1 , changing the velocity 2 (the speed and/or the direction) of the ball. 1 :-- Force is an interaction between two objects . 2 :-- Force (external) changes the velocity, causes acceleration , of the object. Force: PHYS 1L03, Winter 2009, McMaster University, R.Nejat Brief Review on adding vectors • If you do not remember how to add vectors in component form, you should watch the tutorial video on vectors posted on AVENUE • DO NOT SKIP THIS STEP OR YOU WILL BE LOST FOR THE REST OF THE TERM! PHYS 1L03, Winter 2009, McMaster University, R.Nejat • We can always break any 2D vector up into components along two perpendicular axes, such as x and y: θ Brief Review on adding vectors PHYS 1L03, Winter 2009, McMaster University, R.Nejat θ y x A A A r r r + = θ cos A A x = sin A A y = 2 2 2 x x A A A + = 2 2 x x A A A + = x y A A = tan ( 29 y x A A A r r r , = ( 29 y x A A A , = r ( 29 , A A = r Brief Review on adding vectors
3 PHYS 1L03, Winter 2009, McMaster University, R.Nejat Review: Adding two vectors: • Find the resultant of two vectors F 1 and F 2 , shown below = iy y F R F 1 F 2 R = ix x F R 2 1 F F R r r r + = A simple way to find the resultant of two vectors is finding the components of it. 1. Find the x and y components of each

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Sprinter-L-Avenue - Sprinter Biomechanics Biomechanics...

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