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Application of force in sport

Linear, angular & general motion

Newtons laws of motion (1st, 2nd & 3rd)

Introduction

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Application of force in sport

Force can cause a bod at rest to mo!e, c"ange direction,accelerate#decelerate or c"ange an ob$ects s"ape%

ou can appl t"is to a penalt 'ic' in football

"e football will remain at rest until 'ic'ed w"ic" will causemo!ement% *f t"e 'ic' is sa!ed, t"e ball will c"ange directionw"en t"e 'eeper parries it awa% "e plaer can acceleratetowards t"e ball before 'ic'ing it% "en, upon scoring, w"en t"eball "its t"e net it will decelerate and slow down% +"en t"e ball is

initiall struc' wit" t"e boot, it will in fact slig"tl deform andbecome more o!al s"aped%

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Linear, angular & general motion

Linear motion -otion along a line, t"is canmean a straig"t line (sliding down a "ill) or acur!ed line (bobsleig" around a trac')

Angular motion -o!ement must "appen

around a fi.ed point or a.is (turning a bi'e)"in' of it li'e t"e $oints in our bod, w"ic"allow angular motion for our limbs%

/eneral motion -ost mo!ements arecombination of linear and angular, t"is is

general motion% (w"eelc"air at"lete mo!es ina linear motion but t"e swinging action of "isarms are angular motions)%

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Newtons laws of motion

Newtons 1st law (law of inertia) "is states t"at abod continues to be in a state of rest unless actedupon b an e.ternal force% Again t"is can be related

to football, t"e ball will not mo!e unless struc' b t"efootballers boot%

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Newtons 2nd law (law of acceleration) "is law sas t"at w"en aforce acts on an ob$ect, t"e rate of c"ange of momentume.perienced is proportional to t"e si0e of t"e force and ta'es placein t"e direction in w"ic" t"e force acts% "is basicall means t"at in

football t"e more powerful t"e 'ic', t"e more acceleration will occurwit" t"e ball, also t"e balls direction is towards goal%

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Newtons 3rd law "is one states t"at for e!er action t"ere isan eual and opposite reaction, t"is simpl means t"atw"ene!er an ob$ect e.erts force on anot"er t"ere will be aneual and opposite reaction e.erted b t"e second ob$ect on t"efirst% o w"en t"e force of t"e struc' ball "its t"e crossbar t"ereaction is t"at t"e crossbar e.erts an eual force to t"eopposite direction to rebound t"e ball awa%

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