Answer:
Friction between the wheels and track causes energy to leave the system in the form of heat.
Explanation:
1) The main idea of the excerpt, is Washington's expression of how the country must be equal and not divide in order for it to thrive.
2) Others tend to differentiate themselves with others instead of unifying, and seeing past others differences to improve the state of our country.
artifact and diary because they are tge first hand information
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