# How to find the impulse strength

Power - a physical quantity acting on a body which, in particular, gives it a certain acceleration. To find the impulse of force, it is necessary to determine the change of momentum, ie, pulse of the body.

## Instruction how to find the impulse strength

Step 1:

The motion of the material point is caused by the influence of some force or forces that give it acceleration. a certain amount of force application result for some time is the respective amount of traffic. The impulse force is a measure of its validity over time: Pc = favg • Δt, gdeFsr - the average force acting on the body; Δt - time interval.

Step 2:

The momentum is momentum of the body. It is a vector quantity, co-directional speed and equal to the product of its body weight: Pt = = m • v.

Step 3:

Thus, the momentum of force is the change of momentum of the body: Pc = ΔPt = m • (v - v0), gdev0 - the initial velocity; v - the final velocity of the body.

Step 4:

This equation shows Newton's second law with respect to an inertial frame of reference: the derivative of a material point in time is equal to the value of the constant force acting on it: favg • Δt = ΔPt → favg = dPt / dt.

Step 5:

The total momentum of the system of several bodies can be changed only under the influence of external forces, and its value is directly proportional to their sum. This is a consequence of the second and third laws of Newton. Let the system consists of three interacting bodies, then right: Ps1 + Pc2 + Pc3 = ΔPt1 + + ΔPt2 ΔPt3, gdePci - impulse force acting on the body i; Pti - momentum of the body i.

Step 6:

This equation shows that if the sum of the external forces is zero, the total momentum of a closed system of bodies is always constant, despite the fact that the internal forces change their impulses. This principle is called the law of conservation of momentum. It should be borne in mind that it is a vector sum.

Step 7:

In reality, the phone system is rarely closed, because it always operates at the force of gravity would be. It modifies the vertical pulse system, but has no effect on it, if the motion is horizontal.