How would you describe a force?

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Presentation transcript:

How would you describe a force? Bellwork – 10/26/16 How would you describe a force?

Force – Varieties ( Honors ) Friction Gravity Air-resistance Drag Lift Push or Pull Magnetic Support/Normal Tension Contact Thrust Nuclear Impact Force of gravity/weight ( W ) Applied force/thrust/lift/impact/pressure-related ( A ) Friction/air-resistance ( f ) Contact force / Normal ( support ) ( N ) Tension ( cables, ropes, strings, springs, plastic spoons ) ( T ) Electro-magnetic Nuclear ( strong & weak )

Forces – Varieties ( AP ) Force of gravity Air-resistance Applied force Thrust Friction Impact Contact force Lift Tension Magnetic Nuclear Weight Force of gravity/weight ( W ) Applied force/thrust/lift/impact/pressure-related ( A ) Friction/air-resistance ( f ) Contact force ( simply from objects touching? ) ( C ) Normal ( support ) ( N ) Tension ( cables, ropes, strings, springs, plastic spoons ) ( T ) Electro-magnetic Nuclear ( strong & weak )

Feeler & the Dealer Every force exists in a PAIR Something Feels the force that something else Deals Example: You and the floor? It is a force pair You exert weight on the floor & the floor feels it ( Wf,p ) Opposite is true also – the floor is exerting a support force ( Normal ) and you feel it ( Np,f ) Same subscripts but reversed indicates force-pair