Which statement about friction in a system is true?(1 point)
Responses
Friction increases the total energy of a system.
Friction increases the total energy of a system.
Friction converts some energy on the macroscopic scale to energy on the molecular scale.
Friction converts some energy on the macroscopic scale to energy on the molecular scale.
Friction decreases the total energy of a system.
Friction decreases the total energy of a system.
Friction converts some energy on the molecular scale to energy on the macroscopic scale.
Friction converts some energy on the molecular scale to energy on the macroscopic scale.
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Friction converts some energy on the macroscopic scale to energy on the molecular scale.
The statement "Friction converts some energy on the macroscopic scale to energy on the molecular scale" is true.
To determine which statement about friction in a system is true, we need to understand the concept of friction and its effect on energy in a system.
Friction is a force that opposes motion between two surfaces that are in contact with each other. When two objects are in contact and one is moving or trying to move, friction acts in the opposite direction to the motion or the applied force.
From the given options:
1. Friction increases the total energy of a system.
2. Friction converts some energy on the macroscopic scale to energy on the molecular scale.
3. Friction decreases the total energy of a system.
4. Friction converts some energy on the molecular scale to energy on the macroscopic scale.
To determine which statement is true, we can analyze each option:
1. Friction increases the total energy of a system.
This statement is incorrect. Friction does not increase the total energy of a system. Instead, it converts some of the energy in the system into other forms, such as thermal energy or sound energy.
2. Friction converts some energy on the macroscopic scale to energy on the molecular scale.
This statement is partially correct. Friction does convert some energy on the macroscopic scale (motion of objects) to energy on the molecular scale (vibrations and rotations of molecules at the contact surface).
3. Friction decreases the total energy of a system.
This statement is incorrect. Friction does not decrease the total energy of a system. It acts as a force opposing motion but does not remove energy from the system. Instead, it transforms the energy into different forms.
4. Friction converts some energy on the molecular scale to energy on the macroscopic scale.
This statement is incorrect. Friction does not convert energy on the molecular scale to energy on the macroscopic scale. Instead, it converts energy on the macroscopic scale to energy on the molecular scale by generating heat through molecular interactions.
Based on the analysis, the correct statement is:
Friction converts some energy on the macroscopic scale to energy on the molecular scale.