060225_notes13questions

Your work has been received. Please scroll through the document to see any inserted notes (inserted at the appropriate place in the document, in boldface) and a note at the end. The note at the end of the file will confirm that the file has been reviewed; be sure to read that note. If there is no note at the end, notify the instructor through the Submit Work form, and include the date of the posting to your access page.

......!!!!!!!!...................................

23:48:07 What would a graph of potential energy vs. stretch look like for the rubber band?

......!!!!!!!!...................................

RESPONSE --> would be increasing at an increasing rate

.................................................

......!!!!!!!!...................................

23:48:22 * potential energy increases with stretch; and since the force required to stretch the rubber band increases with stretch, the PE increases at an increasing rate with respect to the stretch. **

......!!!!!!!!...................................

RESPONSE --> right

.................................................

......!!!!!!!!...................................

23:49:10 What would a graph of kinetic energy vs. distance look like for the rail sliding across the floor? Would the graph be linear or would it curve? If it would curve, in what direction would it curve?

......!!!!!!!!...................................

RESPONSE --> decreaseing at a decreasing rate

.................................................

......!!!!!!!!...................................

23:49:17 ** since the rail is moving more and more slowly, and since the work done against friction depends on the distance moved, the rail will lose KE more and more slowly. So the graph of KE vs. distance will decrease, but at a decreasing rate. **

......!!!!!!!!...................................

RESPONSE --> right

.................................................

......!!!!!!!!...................................

23:50:28 How is it that we can regard the force of gravity as equivalent to two forces, one parallel and one perpendicular to the ramp?

......!!!!!!!!...................................

RESPONSE --> these two forces equal the force of gravity.

.................................................

......!!!!!!!!...................................

23:50:47 The forces wParallel and wPerpendicular are to be regarded as completely equivalent to the weight. We should understand that if we pulled on an object with two forces equal to these, and in the indicated directions, they could have an effect identical to that of the downward force of gravity. So the force of gravity could be replaced by these two forces. Given a high enough coefficient of friction, the force acting parallel to the incline could be equal and opposite to the frictional force. The normal force is the elastic force required to exactly balance the weight component perpendicular to the ramp.

......!!!!!!!!...................................

RESPONSE --> yes they are completely equivalent to the weight

.................................................

......!!!!!!!!...................................

23:50:52 ""

......!!!!!!!!...................................

RESPONSE --> ?

................................................."

Your work on this assignment is good. Let me know if you have questions.