Question

14 both parts
Q14(a) The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
(b) Does the tronsfer of energy take place when you push a huge rock with oil your might and fail to move it? Where is the energy you spend going?

Answer 1

Dear Student ,
14.(a) Here it does not violate the law of conservation of energy .You must know that if a body falls freely then its speed and kinetic energy both will increase .
Now you may think from where dos this kinetic energy come?
Look when a body falls freely then the potential energy is converted into kinetic energy and hence the sum of the energies remains constant through out the motion .So the energy is conserved .
(b) Now here look the energy applied by you is converted in to heat energy that's why you sweat .
But scientifically no work is done by you as the displacement of the huge rock is zero .

Regards