Inertia is the concept designating preservation of speed of a body and continuation of the movement of a body without impact on it of external forces. For example, if any force pushed away a ball, it will continue to move any given time after influence of force is and there is a movement on inertia.
Instruction
1. Determine inertia force. Inertia force - the size having the direction or vector, it is equal to the mass of m of the material point increased by its acceleration, and it is directed opposite to acceleration. If in a task the curvilinear movement is given, decompose force of inertia on a tangent, or a so-called tangential component (designation: Jt) which will be sent to opposite tangent acceleration (designation: wt) and also on a centrifugal component (designation: Jn), it is directed along the main normal to a trajectory from the center of curvature.
2. Remember a formula: Jt = nwt, Jn = mv2/r where v is the speed of this point, r is the radius of a circle of the curvature presented in a task, a trajectory.
3. When studying the movement in relation to such inertial reference system inertia force is usually entered for an opportunity (only formal) to work out dynamics equations in the form of the simple equations of a statics (by the principle D' Alembert, Kinetostatik).
4. The concept "inertia force" is used when studying the relative movement. In that case accession to forces operating on a material point also interactions with other bodies of figurative Jper and Coriolis of inertia Force Jkop increase that allows to work out the equations of the movement of this point in noninertial (or mobile) a reference system just as in inertial (motionless).