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Acceleration of gravity problem

  • Thread starter allora_97
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  • #1
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Homework Statement


A(n) 43 kg block is pushed along the ceiling
with a constant applied force of 560 N that
acts at an angle of 67◦ with the horizontal,
as in the figure. The block accelerates to the
right at 4.5 m/s2.
The acceleration of gravity is 9.8 m/s2 .
What is the magnitude of the normal force
the ceiling exerts on the block?
Answer in units of N.


Homework Equations


F=ma
Fn = mg



The Attempt at a Solution


I tried to find Fn = mg = 560sin67, it didn't work
any ideas?
 
Last edited:

Answers and Replies

  • #2
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here's the image
 

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PhanthomJay
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Homework Statement


A(n) 43 kg block is pushed along the ceiling
with a constant applied force of 560 N that
acts at an angle of 67◦ with the horizontal,
as in the figure. The block accelerates to the
right at 4.5 m/s2.
The acceleration of gravity is 9.8 m/s2 .
What is the magnitude of the normal force
the ceiling exerts on the block?
Answer in units of N.


Homework Equations


F=ma
Fn = mg
The normal force, F_n, is the perpendicular contact force exerted by the ceiling on the block. It is not the weight of the block.

The Attempt at a Solution


I tried to find Fn = mg = 560sin67, it didn't work
any ideas?
Your equation makes no sense. 560sin67 is the upward vertical component of the applied 560 N force. Look at all the forces acting in the vertical direction, determine the net force acting in that direction, and then use one of Newton's laws to solve for F_n.
 

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