Horizontal force on frictionless ramp

AI Thread Summary
A 100 N box is pushed with a horizontal force F at a 30-degree angle on a frictionless ramp, prompting a calculation of F and the normal force N. The equations used are Fcos(theta) - mgsin(theta) = 0 for part A and N - Fsin(theta) - mgcos(theta) = 0 for part B. Initial calculations yield approximately 57.74 N for F and 115 N for N, although the accuracy is questioned. Participants note the need for additional information regarding the box's motion, such as whether it is stationary, moving at constant velocity, or accelerating. Clarifying these conditions is crucial for determining the correct values.
phunphysics2
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A 100 N box is being pushed with a horizontal force F at 30 degrees on a frictionless ramp. Determine F and N (normal force). I got about 57.74 and about 115 for the second part (I don't know if it is right)




Fcos(theta) -mgsin(theta)=0 for part A


N-Fsin(theta)-mgcos(theta)=0 for part B

Please let me know what you get.

Thank you for your help! Any and all answers are much appreciated!
 

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yep, your answers look good to me :)
 
Thanks!
 
phunphysics2 said:
A 100 N box is being pushed with a horizontal force F at 30 degrees on a frictionless ramp. Determine F and N (normal force). I got about 57.74 and about 115 for the second part (I don't know if it is right)

Fcos(theta) -mgsin(theta)=0 for part A

N-Fsin(theta)-mgcos(theta)=0 for part B

Please let me know what you get.

Thank you for your help! Any and all answers are much appreciated!
There is not enough information to answer this question.

Is the box stationary?

Is it moving at a constant velocity?

Is it accelerating? If so, at what rate?
 
haha, yes, I was going to say that. I assumed that the box was moving at constant speed, and I got the same answer as him, so I guess he just forgot to write that in the first post.
 
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