Physics Help Forum Newton's Law Related Question

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 Jun 6th 2010, 07:05 PM #1 Junior Member   Join Date: May 2010 Posts: 6 [Solved] Newton's Law Related Question Only two forces act on an object (mass = 4.00 kg), as in the drawing. Find the magnitude and direction (relative to the x axis) of the acceleration of the object. I honestly have no clue on how to start this problem. Last edited by Kookehs; Jun 22nd 2010 at 07:18 PM.
Jun 6th 2010, 08:48 PM   #2
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 Originally Posted by Kookehs Only two forces act on an object (mass = 4.00 kg), as in the drawing. Find the magnitude and direction (relative to the x axis) of the acceleration of the object. I honestly have no clue on how to start this problem.
Can you tell me what is the resultant force? The resultant force is the sum of all forces acting on the body. It will be 1 vector. Can you give me its modulus and direction (with respect to the x-axis)?
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Jun 6th 2010, 09:26 PM   #3
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 Originally Posted by arbolis Can you tell me what is the resultant force? The resultant force is the sum of all forces acting on the body. It will be 1 vector. Can you give me its modulus and direction (with respect to the x-axis)?
I can solve it with trig I believe. But how do I make the triangle? Split it at 45 degrees?

Jun 8th 2010, 01:15 PM   #4
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 Originally Posted by Kookehs I can solve it with trig I believe.
Yes.
 But how do I make the triangle? Split it at 45 degrees?
Hmm I don't really understand what you mean by splitting it.
You have 2 vectors. How do you add vectors? Check out your class notes.
Once you've added the 2 vector forces, you will get a new vector called the resultant. Use Pythagoras theorem to calculate its length. Then come up here with your work or doubts.
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 Jun 8th 2010, 02:16 PM #5 Junior Member   Join Date: May 2010 Posts: 6 Am I going in the right direction?
Jun 8th 2010, 06:36 PM   #6
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 Originally Posted by Kookehs Am I going in the right direction?
No.
Here is described how you add vectors: Adding Vectors Step by Step.

Can you make a sketch or describe the addition of the 2 forces?
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