The stone falls without initial speed. Air resistance is negligible. Choose the correct statement. A) The potential energy of the

| December 8, 2020 | education

The stone falls without initial speed. Air resistance is negligible. Choose the correct statement. A) The potential energy of the stone increases. B) the kinetic energy of the stone decreases. C) The total mechanical energy of the stone does not change when it falls

Potential energy decreases, and kinetic energy, accordingly, increases, because kinetic energy is literally the energy of motion, potential energy is a stored “reserve” of energy by the body. Therefore, when the body does not move, the potential energy is maximum, and the kinetic energy is zero.
The correct answer is under “С”, the total mechanical energy of the body does not change when falling, only the kinetic and potential energies change:
E (full) = E (k) + E (n)
Answer: C) The total mechanical energy of the stone does not change when it falls



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