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Question Number 22071 by Tinkutara last updated on 10/Oct/17

$$\mathrm{STATEMENT}-1:\mathrm{If}\mathrm{an}\mathrm{object}\mathrm{is}\mathrm{at}$$$$\mathrm{rest}\mathrm{then}\mathrm{there}\mathrm{should}\mathrm{not}\mathrm{be}\mathrm{any}\mathrm{friction}$$$$\mathrm{on}\mathrm{it}.$$$$\mathrm{STATEMENT}-2:\mathrm{If}\mathrm{an}\mathrm{object}\mathrm{is}\mathrm{moving}$$$$\mathrm{then}\mathrm{the}\mathrm{friction}\mathrm{acting}\mathrm{on}\mathrm{it}\mathrm{has}\mathrm{to}\mathrm{be}$$$$\mathrm{kinetic}.$$$$\mathrm{STATEMENT}-3:\mathrm{If}\mathrm{an}\mathrm{object}\mathrm{is}\mathrm{at}\mathrm{rest}$$$$\mathrm{then}\mathrm{kinetic}\mathrm{friction}\mathrm{cannot}\mathrm{act}\mathrm{on}\mathrm{it}.$$

Commented by ajfour last updated on 10/Oct/17

$$ablocknotslippingandresting$$$$onaroughinclinedplane,then$$$$frictionisinaction.$$$$$$$$awheelrollingwithoutsliding$$$$onaroughplainhorizontalfloor,$$$$nofrictionacts.$$$$$$$$otherforceskeepatheobject$$$$atrestwhilesomeotherobject$$$$slidesoverit.$$

Commented by Tinkutara last updated on 11/Oct/17

$$3^{\mathrm{rd}}\mathrm{is}\mathrm{not}\mathrm{clear}.\mathrm{Why}\mathrm{kinetic}\mathrm{friction}$$$$\mathrm{will}\mathrm{act}\mathrm{on}\mathrm{it}\mathrm{then}?$$

Commented by ajfour last updated on 11/Oct/17

$$sayalightblockslidesonthe$$$$inclinedsurfaceofaheavy$$$$wedge,thewedgeremainsat$$$$restbutthereiskineticfriction$$$$betweenblockandwedgewhich$$$$thewedgeexpeeiencesanditis$$$$atrestduetostaticfrictionon$$$$ground.$$

Commented by Tinkutara last updated on 11/Oct/17

$$\mathrm{Thank}\mathrm{you}\mathrm{very}\mathrm{much}\mathrm{Sir}!$$

Answered by ajfour last updated on 10/Oct/17

$$1-notalwaystrue$$$$2-notalwaystrue$$$$3-notalwaystrue$$

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