The Secrets of Simple Physics: 2 Problem Solutions Explained

[lusterjester]

I have 2 problems.
1) When you run you do not keep your legs striaght, but rather bend them. What is the reason?

2) Assume you are an athelte, and you believe you can tear paper with just one hand? what is the best stragety? list the components of your strategy stated in terms of physics princples. Will there, in theory at least, ever be a set of circumstances in which will not allow you to use one hand without winding up with paper all over the floor? explain.




No equations



Im believing the first question is about your body needing an upward force in order to move correctly and the second one I am completely lost - _ -

 

[dwintz02]

1) If you kept your legs straight, would it be easy to propel yourself in the horizontal direction?

2) I suggest trying to tear paper with one hand and list what you think works, that way someone can explain/help you with translating what you intuitively know into physics language. Might just be me, but I'm finding it difficult to help with this question without just giving you the answer.