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Newton's Second Law Problem

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Homework Statement


There is an attachment of a FBD, and you have to solve for the following:
Fg=?
Fnet?
Mass=?

The Attempt at a Solution


I know you will have to equate equations, but I dont know how to go about doing this.
I do know that Fg= m x 9.8, I isolated various equations and subbed them into each other and got no answer.
 

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Answers and Replies

  • #2
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Remember that the net force = mass X acceleration.
You have the acceleration, you have the two forces acting on the mass, and mass m.

You are almost there.
 
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  • #3
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Remember that the net force = mass X acceleration.
You have the acceleration, you have the two forces acting on the mass, and mass m.

You are almost there.
Fnet=ma
-Fg+F=ma
-9.8m+110 = m
-10.8m=-110
m=10.2kg

Fnet=-Fg+F
=-9.8m+110
=-9.8(10.2)+110
Fnet=10.04N

a= Fnet/m
a=10.04/10.2
a=0.98 m/s/s

Is this correct?
 
  • #4
747
36
Looks good. However, you might use some more significant digits as the last part, a should be 1.0 as given.
 

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