Physcial Science
posted by Ray S on .
How can I apply Newton's First and Second Law to walking?
I'm thinking the 1st, is the muscles would apply an unblanced force to make us move?
Secondif we're walking and the mass of our body is 130 lbs and we're accelerating at 4 miles per hour, then the force necessary to keep us in motion would be 520
Please give me any feedaback that you could provideI need to draw diagrams and everything but I do that once I get a feel. I know the two laws, I just don't get how to aplly them

I think I would avoid the muscles.
Feet on the ground.
newtons first Law: consider if it were on ice? if frictionless, the person would stay in motion (still). but with friction, the shoes can apply a force on the pavement, and the pavement can apply a force on the shoes, allowing motion.
Second law: when turning direction, shoes apply a sideways force, causing a new acceleration (change of direction).
Third law: for every force the shoe applies, the pavement applies an equal and opposite force. 
Thanks alot I really appreciate it