I need help with these physics questions. If you can answer them that will be awesome.?

Posted on 2016-02-29 18:58:00 in Physics by BRANDON

1) Why might your foot hurt if you kick a heavy desk 
2) When you are running and want to stop quickly, you must decelerate quickly. (a) What is the origin of the force that causes you to stop, (b) estimate the maximum rate of deceleration of a person running at top speed to come to rest. 
3) You pull a box with a constant force across a frictionless table using an attached rope held horizontally. If you now pull the rope with the same force at an angle to the horizontal (with the box remaining flat on the table), does the acceleration of the box (a) remain the same, (b) increase, or (c) decrease? Explain

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