Which of the following statements a - d is true concerning non-conservative forc

Question

Which of the following statements a - d is true concerning non-conservative forces? A non-conservative force acting through a displacement decreases thermal energy. The change of mechanical energy to thermal energy by a non-conservative force acting through a displacement is reversible. A non-conservative force acting through a displacement decreases mechanical energy. When a non-conservative force acts through a displacement, the decrease in mechanical energy is not always equal to the increase in thermal energy. Statements a -d are all false. QUESTION 2 Which of the following statements a -d about mechanical energy is true? a Mechanical energy is sum of kinetic energy and work. b. Mechanical energy is the sum of potential energy and work. .Mechanical energy is the sum of kinetic and potential energy. d. Mechanical energy is the sum of kinetic energy, potential energy and work. e.Statements a -d are all false.

Explanation / Answer

Question 1)

Correct statement is  c) A non-conservative force acting through a displacement decreases mechanical energy.

a) False , since a non-conservative force acting through a displacement increses thermal energy.

b) False, since The change in energy from mechanical to thermal is irreversible.

d) False , since the decrease in mechanical energy leads to increase in equal amount of thermal energy.

e) False

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Question 2)

Correct statement is c) Mechanical energy is the sum of kinetic and potential energies.

Work done by all forces on a mechanical system leads to increase in kinetic energy.

Statements a,b,d and e are False ,

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