Instruction
1
The force of gravity of the body approximately constant, equal to the product of body mass on the acceleration of free fall g. The acceleration of gravity g ≈ 9.8 Newton per kg, or meter per second squared. g is a constant, the value of which varies only slightly for different points of the globe.
2
By definition, the elementary work of the force of gravity — the product of the force of gravity at an infinitely small movement of the body: dA = mg · dS. The displacement S is a function of time: S = S(t).
3
To find the work forces of gravity all the way L, you have to take the integral of the elementary work in L: A = ∫dA = ∫(mg · dS) = mg · ∫dS.
4
If the task is assigned to a function of speed from time to time, the dependence of travel time can be found by integration. For this you will need to know the initial conditions: the initial velocity, coordinates etc.
5
If the dependence of the acceleration time t, will have to integrate twice, because acceleration is the second derivative of the displacement.
6
If the task of this coordinate the equation, it should be understood that the movement reflects the difference between the starting and ending coordinates.
7
In addition to the force of gravity, the physical body can be other forcesaffecting its position in space. It is important to remember that the work is an additive value: the work of the resultant force is equal to the sum of the work terms of forces.
8
According to the theorem of Kenig, the work force on the moving material point is equal to the increment of the kinetic energy of this point: A(1-2) = K2 - K1. Knowing this, you can try to find the work of the force of gravity through kinetic energy.