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metalInferno
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Direction of Friction Problem .. HELP!
i am a student studying very basic rotational motion . i recently came across these problem while i was reading my book .
1. in 1 question , when a body was rolling (with external force) on a rough horizontal surface , the force of friction was in the same direction as the applied force .
2. a body was rolling down an inclined plane (with no external force) with angle of inclination [tex]\theta[/tex] the the force of friction was opposite to the direction of motion . Please explain slowly and step by step as this is very important .
none
all i noe is that when a body rotates the friction force is supposed to be opposite and should somehow increase the angular acceleration . but if in a case when it is in the same direction as the motion it should decrease the angular acceleration . please feel free to point out if i m wrong .
Homework Statement
i am a student studying very basic rotational motion . i recently came across these problem while i was reading my book .
1. in 1 question , when a body was rolling (with external force) on a rough horizontal surface , the force of friction was in the same direction as the applied force .
2. a body was rolling down an inclined plane (with no external force) with angle of inclination [tex]\theta[/tex] the the force of friction was opposite to the direction of motion . Please explain slowly and step by step as this is very important .
Homework Equations
none
The Attempt at a Solution
all i noe is that when a body rotates the friction force is supposed to be opposite and should somehow increase the angular acceleration . but if in a case when it is in the same direction as the motion it should decrease the angular acceleration . please feel free to point out if i m wrong .
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