31)The center of mass of the clothesline is in the middle so by nature it shud attain a configuration at which it have the minimum potential energy so it curves a little at the center.
Ques1) A clothesline hangs between two poles. No matter how tightly the line is stretched, it always sags a little at the center. Explain why.
Ques2) A block rests on an inclined plane with enough friction to prevent it from sliding down. To start the block moving, is it easier to push it up the plane or down the plane? Why'?
Ques3) A crate of books rests on a levellloor. To move it along the floor at a constant velocity, why do you exert a smaller force if you pull it at an angle @ above the horiwntal than if you push it at the same angle below the horiwntal?
Ques4) You are pushing a large crate from the back of a freight ele- vator to the front as the elevator is moving to the next Iloor. In which situation is the force you must apply to move the crate the smallest and in which is it the largest: when the elevator is acceler- ating upward, when it is accelerating downward, or when it is trav- eling at constant speed? Explain.
Ques5) The moon is accelerating toward the earth. Why isn't it getting closer to us?
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13) assuming that the floor has friction, if u pull it at an angle @ then the vertical component of ur force points upward and decreases the net vertical force on it. hence the normal reacn. and also the friction decreases. the opposite happens during pushing at an angle @ since the vertical component points downward.
