Physics 1 Problem Solutions 57

Physics 1 Problem Solutions 57 - Chapt. 5 Newtons Laws and...

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Unformatted text preview: Chapt. 5 Newtons Laws and Dynamics I 53 a) The GROUND FORCE reaches out across space and pushes upward on each bit of your body independently of every other bit. The ground force is also a FIELD FORCE . b) The ground exerts a force on the soles of your feet and the soles of your feet on the next layer of your body and the next layer of your body on the next layer of your body and so on until the top of your head. Each layer pushes up with only enough force to balance the gravity force on the mass above. The ground force and the forces exerted by the layers of our bodies are CONTACT FORCES . A CONTACT FORCE acts over a very short range: so short that if the distance between the two objects exerting equal and opposite contact forces on each other is more than microscopic there is no contact force at all. c) Since you are always off the ground, the question has no answer. d) Since you are always off the ground, the question is hypothetical and the answer, speculative....
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