![Quote](images/misc/quote_icon.png)
Originally Posted by
jboggs
In the linear equation, F=ma, the force F causes m mass to linearly accelerate. In the rotary equation, T=Ia, torque causes a body of inertia I to angularly accelerate. Both are "laboratory" type equations that provide an understanding of basic physics. They do not account for "real world" affects such as friction or restrictive geometries. Those other affects will always vary in each application, but the basic physical laws of motion still apply. Force or torque can be consumed creating acceleration or overcoming friction, but not both. If you just have enough force or torque to accelerate your mass but not enough to overcome whatever real world friction may apply in your application, you will have no acceleration. Likewise if you only have enough force or torque to overcome friction but none left over for acceleration, you will still have no acceleration. If your drill can only overcome the friction in your system it will turn but it will not accelerate.