DATE-8/09/16 ABHISHEK SINGH ROLL.NO.25

                                  

QUESTION  AND  ANSWER

Q 1) AN OBJECT EXPERIENCES   A NET ZERO EXTERNAL UNBALANCED FORCE. IS IT POSSIBLE FOR OBJECT TO BE TRAVELLING WITH A NON ZERO VELOCITY? IF YES, STATE THE CONDITIONS THAT MUST BE PLACED ON THE MAGNITUDE AND DIRECTION OF THE VELOCITY.  IF NO, PROVIDE A REASON.

ANS 1) YES AN OBJECT MAY TRAVEL WITH A  NON ZERO VELOCITY EVEN WHEN THE NET EXTERNAL FORCE ON IT IS ZERO. A RAIN DROP FALLS DOWN WITH A CONSTANT VELOCITY. THE WEIGHT OF THE DROP IS BALANCED BY THE UPTHRUST AND THE VISCOSITY OF AIR. THE NET FORCE DROP FROM THE ZERO.

Q 2) WHEN WE BEAT THE CARPET WITH A STICK, IT DUST COMES INTO THE OF IT.  EXPLAIN, WHY?
WHEN WE BEAT A CARPET WITH STICK , IT COMES TO MOTION. B UT THE DUST PARTICLES CONTINUE TO AT REST DUE TO THE INERTIA AND GET DETACHED FROM THE CARPET.

Q 3) WHY IS  IT ADVISED TO TIE ANY LUGGAGE KEPT  ON THE ROOF OF A BUS WITH  A ROPE?
DUE TO SUDDEN JERKS OR DUE TO THE BUS TAKING SHARP TURN TO THE ROAD, THE LUGGAGE MAY FALL  DOWN FROM THE ROOF BECAUSE OF  ITS TENDENCY  TO CONTINUE MOVING IN THE ORIGINAL DIRECTION. TO AVOID THIS., THE LUGGAGE IS TIED WITH THE A ROAP ON THE ROOF.

Q 4) A BATSMAN HITS A CRICKET BALL WHICH  THEN ROLLS ON A  LEVEL GROUND. AFTER COVERING A SHORT DISTANCE , THE BALL COMES TO REST. THE BNALL HARD ENOUGH
ANS)  THERE IS THE FORCE ON THE BALL OPPOSING THE MOTION.
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