hi i need help on two of my homework problems one on work and the other on force As you walk, there is a static frictional force between your shoes and the ground. Is any work done? Explain your answer. If three objects exert forces on a body, can they all do work at the same time? Explain. (for this question I'm thinking the answer is yes but I'm not sure about it) I can't figure them out, it would be great if someone can help me Thanks!