What is called mechanical work? How to determine the work of gravity?

1. What is called mechanical work? 2.How to determine the work of gravity? 3.Does the work of gravity depend on the type of trajectory? 4. If the body is moving up, then what sign has the work of gravity, positive or negative? 5. What is the work of the force under the influence of which the body rises? 6. What is power and how to determine it? 7. In what units is power measured? 8.Draw the formula by which the developed power is calculated?

1. Mechanical work is a scalar physical quantity that characterizes the change in body position under the action of force. Mechanical work is equal to the product of the force modulus by the displacement modulus.

2. The work force of gravity is equal to the change in potential energy, taken with the opposite sign. A = – (Ep2 – Ep1).

3. If the trajectory of the body is not rectilinear, and the body moves under the action of gravity, then the work of gravity does not depend on the trajectory of the body,

4. If the body moves up, then the potential energy increases and the force of gravity does negative work.

5.A = – mgh

6. Power is the ratio of the work done in a certain period of time to this period of time.

7. The unit of measurement of power in the international SI system is watt.

8. N = A / t.