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Question

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       Final 3                        Physics 7A Summer Session II        September 9, 2015

3a (5 points). Here's a PE graph. Please label a location where the force is in the (+) x direction, a location where it is in the (-) x direction and a location where there is no force (clearly label which is which). Also explain how you know. Thank you.

[1] b (5 points) If a particle starts at x = 1m, with Etotal = 3J, draw the KE graph and tell me if this is a bound state (is the particle bounded)? Wait, how did you know that? Explain.

Please show illustrations and detail solution. Thank you in advance

Explanation / Answer

a)   For negative side of PE graph ,   the force is in the (+) x direction .

      For positive side of PE graph ,   the force is in the (-) x direction .

      For , the peak locations , there is no force .

b)   Yes, this is a bound state .   Because a bound state describes a system where a particle is subject to a potential such that the particle has a tendency to remain localised in one or more regions of space.

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