# Does force impart energy or guides the conversion of energy into different forms?

Consider the situation when a body is placed on the ground. Let this be the state of reference. Now I lift the body to certain height h above the ground. Here, I am applying force on the body. This provides enough energy for the body to reach the height h above the ground. Here, the force is providing energy to the body to set it in motion.

Now, consider the case when the body is dropped freely from the height h to the ground. Here, the gravitational force acting on the object directs the conversion of its potential energy into kinetic energy. Here, if the gravitational force was to impart extra energy to the object, then the total mechanical energy of the object would not be constant. So, the source of kinetic energy for the object in this isolated system is only the potential energy that was supplied to it to reach that height h above the ground.

Thus, here comes a dilemma - whether force provides energy to an object to move or directs the conversion of energy that was already present in the object. How do I solve this? Is there any concept that I have not understood well? Thanks in advance for any help...

• Remember it is the energy of a closed system that is conserved, there is no energy really just present in a single body , a single body can carry kinetic energy or be in a potential energy state within a system. In your object at height h coming to the ground potentila is concerted to kinetic, but the potential is in a system "earth object". Commented Jun 24, 2017 at 12:28