lecture chapter 5 part2

lecture chapter 5 part2 - Special forces 1 Normal Force...

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Special forces: 1- Normal Force : label (force from a support surface) Size : depend on press force (weight) of object. No motion in to the surface. ( No smash) N r 2- Tension: force from a rope/string. Label size : varies T, Quantity without a vector hat is only size of it. Direction: along rope, always pointing away from object. Tension inside massless rope in all location has the same size. T r

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and steps 1 identify and isolate the object of interest 2 identify all forces on the objects acted by other objects (why can you pull your hair and leave the ground). . 3 pick x – y axis. ( based on acceleration direction for convenience) 4 break up all forces into x-y components 5 F net x = m a x , F net y = m a y (x,y independent) 6 solve for any two unknowns ( from the above two equations) (Again Math skills here. ) In most cases either a x or a y is zero, if you choose the right x and y directions. (Or both are zero when the object stay rest
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lecture chapter 5 part2 - Special forces 1 Normal Force...

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