Nick J.

asked • 02/09/15

figuring mass

a block pushed with a force of 13.5 N accelerates at 6.5 m/s^2 to the left. what is the mass of the block

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Philip P. answered • 02/09/15

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F = ma, so F/a = m
 
Where:
  • F = Force = 13.5 N
  • m = mass = ?
  • a = acceleration = 6.5 m/s2
 
m = F/a = 13.5/6.5 = ______?
 
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Vivian L.

Philip's answer is correct.  I would like to add one comment.  A Newton is kg-m/s2.  Instead of using N, it would be easier for you to use this.  Then you will understand that to find kg, you must execute division...
(kg-m/s2)/(m/s2).
The units cancel...
(kg-m/s2)/(m/s2)...
kg remain.
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02/09/15

Michael J.

Newton's second law of motion is a very important concept to remember.  Also, take Vivian's advice.  Units is a great way to check whether you have the correct formula, otherwise you will get the wrong numbers.
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02/09/15

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