Answer:
Explanation:
The moving part won't move on its own there's a force but the force isn't enough for something like a bike chain it need grease to move smoothly or else it will just be super stuck or slow.
I would say the first three. But I'm not 100% sure. I'm truly sorry if it's wrong
Answer:
P-positive
N-negative
E-no charge
I am not sure plz show me the question
Knees and elbows are two of the most common ones.