course phy 121
3/20 at 11:00 a.m. It has been a long time since I used trig formulas so I will have to be refreshed on this. I'm used the back book cover (Appendix A-7).
Asst 17 Question 2--------------------------------------------------------------------------------
As on all forms, be sure you have your data backed up in another document, and in your lab notebook.
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A 5 kg cart rests on an incline which makes an angle of 30 degrees with the horizontal.
Sketch this situation with the incline rising as you move to the right and the cart on the incline. Include an x-y coordinate system with the origin centered on the cart, with
the x axis directed up and to the right in the direction parallel to the incline.
The gravitational force on the cart acts vertically downward, and therefore has nonzero components parallel and perpendicular to the incline.
Sketch the x and y components of the force, as estimate the magnitude of each component.
What angle does the gravitational force make with the positive x axis, as measured counterclockwise from the positive x axis? Which is greater in magnitude, the x or the y
component of the gravitational force?
answer/question/discussion:
I believe the y component will have the greater component of the gravitiational force.
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Using the definitions of the sine and cosine, find the components of the cart's weight parallel and perpendicular to the incline.
answer/question/discussion:
sin(180-30)= .5= sin(30degrees)
sin(90-30)= .87= cos(30degrees)
I'm really not sure what I'm doing on this so will look at your feedback.???
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How much elastic or compressive force must the incline exert to support the cart, and what is the direction of this force?
answer/question/discussion:
f=ma = 5kg* 9.8m/s^2= 49 N This force exerted by the incline would be going against gravity upward.
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If no other force is exerted parallel to the incline, what will be the cart's acceleration?
answer/question/discussion:
I'm uncertain how to solve for the acceleration based on the data I have.
#$&*
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30 min. I honestly was just looking around for formulas and trying to figure out what I needed to use. I'm refering to Appendix A-7 for now.
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Revised: 06 Feb 2010 17:12:46 -0500"
You don't have a bad start, but you need to put the information together a little more completely.
&#Please compare your solutions with the expanded discussion at the link
Solution
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