anonymous
  • anonymous
when we have a mass on an incline why do we have to break the weight into components?
Physics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
We need to determine the fraction of the object's weight that is parallel and perpendicular to the surface. This is because ONLY the portion that is parallel to the surface can create motion down the incline plane and ONLY the portion that is perpendicular to the surface contributes to the normal force, which is important in friction force calculations.
anonymous
  • anonymous
does tension have an opposing motion?
anonymous
  • anonymous
Tension can either be directed in the direction of motion or opposite of the direction of motion. Take this for example. |dw:1332384041010:dw|The force F moves both blocks 1 and 2, the tension force acts in the opposite direction of the motion if we look at a free body diagram of block 1, while the tension acts in the same direction of motion for block 2. Friction ALWAYS opposes motion.

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anonymous
  • anonymous
isnt tension the force that moves the blocks
Mani_Jha
  • Mani_Jha
Hey eashmore, if friction always opposes motion, how are we able to walk? I think you should say that friction always opposes relative motion between the bodies in contact. |dw:1332385381394:dw| Suppose, I move this system by applying an external force on the lower block. If the system moves together, it is the friction force that moves the upper block in the direction of the force. Friction does so to prevent slipping between the two blocks. Isn't it?
anonymous
  • anonymous
Ah yes! Thanks for presenting this great example. Indeed, friction between m1 and m2 does cause m1 to move with m2.

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