Perpendicular Forces, Acceleration and Mass Problem

  • Thread starter rwishka
  • Start date
  • #1
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Homework Statement



Two perpendicular forces, one of 45.0 N directed upward and the second of 60.0 N directed to the right, act simultaneously on an object with a mass of 35.0 kg. What is the magnitude of the resultant acceleration of the object?

A. 8.68 m/s^2
B. 3.00 m/s^2
C. 5.25 m/s^2
D. 1.41 m/s^2

Homework Equations



F = ma to a = F/m

The Attempt at a Solution



a = F/35.0 kg

I simply don't understand what to do with the two forces? Should I draw a diagram? Please help me!
 

Answers and Replies

  • #2
cristo
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The acceleration on the particle will be due to the resultant force. How can you calculate the resultant of the two forces? Draw a diagram-- it may help you.
 
  • #3
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Would I use the Pythagorean Theorem?

I did (45.0)^2 + (60.0)^2 = c^2
c = 87.46 N

I plugged that into a = 87.46 N/35.0 kg, and got an incorrect answer.

What did I do wrong?
 
  • #4
cristo
Staff Emeritus
Science Advisor
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Your calculation for c is wrong. Try checking it again.
 
  • #5
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Sorry, c is 75 Newtons.

a = 75 N/35.0 kg
a = 2.14 m/s^2

Am I missing a step?

(Thanks for helping me so far)
 
  • #6
cristo
Staff Emeritus
Science Advisor
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Well, that's the answer I get. Either we're both overlooking something, or there's a typo in the question (I'd say that the latter was more likely!) Are you sure you wrote down the question and answers correctly (is there a possibility that the mass is 25kg?)
 
  • #7
16
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I checked and that is the problem. Hmm. Well, thank you for helping me! :)
 

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