Potential for uniform g field. On the earth surface, we have g field, When a mas

Question

Potential for uniform g field. On the earth surface, we have g field, When a mass m is pulled by the gravity field from yA tYa, how much work did the gravity field do? Please find Wjrom AtoB ds = dx + dy (Bis work a vector or a scalar?) BTW, is work a vector or a scalar? YA YB when yB did the gravity field do positive work or negative work? When the gravity field did positive work on m, which energy (potential or kinetic)_ which energy would increase, and would decreases.? If we define the gravitational potential energy UA =0, at y,-0, the gravity potential energy at location ys can be found as the following: The work done by the field W will be equal and opposite to the system's potential energy CHANGE. Wby field from A to B=-AU=-(Up-U.)

Explanation / Answer

Answering 4 parts as per Chegg's gidelines:

1 when Yb < YA ( the body is falling down) , it's a positive work by gravity

2: when the gravity does teh positive work, Kinetic energy would increase, potential energy would reduce.

3) when object moves along the direction of gravtational force, potential energy reduces, gravity force does positive work, and kinetic energy increases

4)when object moves against gravity, it;'s potentiakl energy incraeses, gravity does negative work, and kinetic energy reduces

5) when a positive charge , moves along the direction of electric field, it's potential energy will reduce and kE will increase

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