Question 1:

According to the law of conservation of mechanical energy, the total mechanical energy of a system remains:

Explanation: The correct answer is A) Constant. According to the law of conservation of mechanical energy, the total mechanical energy of a system remains constant if no external work is done on the system. Mechanical energy can be transferred between kinetic energy and potential energy, but the total amount remains constant.

Question 2:

If only conservative forces are acting on an object, the sum of its kinetic energy and potential energy will:

Explanation: The correct answer is C) Remain constant. If only conservative forces are acting on an object, the sum of its kinetic energy and potential energy remains constant. As potential energy decreases, kinetic energy increases, and vice versa, while their sum remains the same.

Question 3:

Which of the following statements is true regarding the conservation of mechanical energy in the absence of non-conservative forces?

Explanation: The correct answer is A) Mechanical energy is always conserved. In the absence of non-conservative forces, such as friction or air resistance, mechanical energy is always conserved. This means that the total amount of kinetic energy and potential energy in the system remains constant.

Question 4:

If the potential energy of an object increases, what happens to its kinetic energy?

Explanation: The correct answer is B) Decreases. If the potential energy of an object increases, such as by moving to a higher elevation, its kinetic energy decreases. This conservation of mechanical energy allows the conversion between potential and kinetic energy, but the total mechanical energy remains constant.

Question 5:

Which of the following is an example of the conservation of mechanical energy?