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Phy 231
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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: ->->->->->->->->->->->-> :
240deg. Cos240= .33, sin240= .95, the y component is greater in magnitude
@& The cosine and the sine are both negative.*@
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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: ->->->->->->->->->->->-> :
w parallel= cos240= .33, w perp= sin240= .95
@& You need to multiply the weight by the sine and cosine to get the components.*@
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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: ->->->->->->->->->->->-> :
.95N in the downward direction
@& You don't say how you got this result, which is incorrect.*@
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• If no other force is exerted parallel to the incline, what will be the cart's acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
.95N/5kg= .19m/s^2
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30min
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