Question

If the only force acting on an object is friction during a given physical process, which of the following
assumptions must be made in regard to the object's kinetic energy?

Answer 1

Answer:

The kinetic energy decreases.

Explanation:

Friction is defined as a opposite force to motion. If friction is the only force acting on an objects, its kinetic energy decreases.

It is so because due to resistive force or friction, kinetic energy is converted to heat energy and that reduces the total kinetic energy in the system.

Hence, the correct answer is "The kinetic energy decreases."

Answer 2

The assumptions must be made base in the object’s kinetic energy in a situation whereby frictional force is the only force acting on an object is A:The kinetic energy decreases.

• Frictional force can be regarded as opposing force that is formed between two surfaces which have their movement in the same direction or opposite directions.

• Friction always brings about reduction in motion of a body which in turn bring a decrease to it's kinetic energy, because it us an energy of motion.

Therefore, option A is correct.

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