brijmohan123456
Jan 6, 2013, 11:36 PM
Newton's third law says that to every action there is a equal and opposite reaction then please consider the my following two doubts:
1.suppose a box of mass 2 kg is put on a table and then the floor of table goes down with a acceleration of 0.1meter/sec^2 here want to ask that as every action there is a equal and opposite reaction so when a force will be applied on table by box then an equal and opposite reaction will also be applied by table on box.So why does only table showed an acceleration.please clear my doubt.
2.everyday in physivs we come across the problems of this kind " spring is going over a horizontally clamped pulley of negligible mass and supports a block of mass M etc and many other things"here I mainly want to ask that as the spring will be pulled down by force Mg due to mass M of block the same reaction will be given upward to spring as a tension,thus due to this there should not be any elongation to spring but it happens.Why is it so?
please consider my doubt seriously and answer it ,the question may appear big but it is more big headache for me as my exams are coming. So please help
1.suppose a box of mass 2 kg is put on a table and then the floor of table goes down with a acceleration of 0.1meter/sec^2 here want to ask that as every action there is a equal and opposite reaction so when a force will be applied on table by box then an equal and opposite reaction will also be applied by table on box.So why does only table showed an acceleration.please clear my doubt.
2.everyday in physivs we come across the problems of this kind " spring is going over a horizontally clamped pulley of negligible mass and supports a block of mass M etc and many other things"here I mainly want to ask that as the spring will be pulled down by force Mg due to mass M of block the same reaction will be given upward to spring as a tension,thus due to this there should not be any elongation to spring but it happens.Why is it so?
please consider my doubt seriously and answer it ,the question may appear big but it is more big headache for me as my exams are coming. So please help