Will the box move?

  • Thread starter OThePestO
  • Start date
  • #1
11
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Hello people, I just joined up and I have just started to learn Physics by myself. I had originally taken Physics in high school but even though I did not get good marks I really enjoyed the concepts. I am now 28 and have completed a Honours BA in Geography and a Masters in Education. I want to learn Physics for my own personal knowledge and perhaps if possible to teach at the high school level (I think I did bad because I had a poor teacher, but I don't want to make excuses). Well I started looking at resources online and have found a site that provides a good introduction; however, I have stumbled upon a question that is giving me some trouble, here it is:


Homework Statement


http://library.thinkquest.org/10796/

You pushed a 1 kg box on floor where u= 0.3. If the force you applied was 5 N, will the box move?


Homework Equations



http://library.thinkquest.org/10796/formula.htm

Ff=uFn Fn=-mg


The Attempt at a Solution



Well I am not sure exactly what the question is asking, I was able to calculate Fn=9.8 and Ff=2.94, but how does that answer the question? In the previous chapters, I worked with mass, acceleration, time, displacement equations, and understand that I may need to combine one or more equations. Do I need to find displacement>0 in order to answer yes/no or am I looking at it wrong?

Thanks.
 
Last edited by a moderator:

Answers and Replies

  • #2
296
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In order for the box to move, your applied force (5N) has to be higher than the box's static friction. How would you express this in mathematical terms?
 
  • #3
11
0
Do you mean F>Ff? If so then 5N>2.94N is true and the box moves. Is that correct?
 
  • #4
296
0
Yes, that's correct.
 

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