According to the law of conservation of energy,..

1.an object loses most of its energy due to friction.
2.the total amount of energy for a system stays the same.
3.the potential energy of an object is always greater than its kinetic energy.
4.the kinetic energy of an object is always greater than its potential energy.

2. the total amount of energy for a system stays the same.

According to the law of conservation of energy, the correct answer is:

2. the total amount of energy for a system stays the same.

The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. In a closed system, the total amount of energy remains constant. Energy may change from potential to kinetic, or from thermal to mechanical, but the sum of all types of energy in a system remains constant.