Which is accessed in the Edit->Project Settings->Time menu. The AddForce() function assumes that the force is applied over the fixed timestep duration set by the Unity engine.īy default, the fixed timestep is set to 0.02 seconds, but you can change it to almost anything you want in the Time Manager settings In our case, t0 = 0s, because it's from the start => so our formula now isĪ = v/t (this is ONLY BECAUSE v0 = 0 and t0 = 0) Happened in the timeframe between 2 seconds and 3 seconds, dt will be t - t0 = 3 - 2 = 1 second). So,ĭv = (v - v0), where "v0" is the velocity in the beginning (in our case v0 = 0, because the object is not moving), "v" is the end velocity (in our case the desired velocity).Ī = (v-v0) / dt, where "dt" is the time it took the velocity to change from v0 to v (in fact, dt = t - t0, t = end time, t0 = starting time. In your case, you want to calculate what force is needed to accelerate a stopped object to a given velocity. If we have NO ACCELERATION, we aren't applying any force, and it doesn't matter if it HAS or HAS NOT velocity. Where "v" is velocity, because it can have velocity when no forces are currently applied to it. Where "F" is force, "m" is mass and "a" is acceleration. When we continue to apply the same force it gains more and more velocity - it has acceleration. The object has some velocity, and when we apply the same force again, it gets pushed again, so it gains more velocity. But now we apply the force again (we are applying it continuously). It is pushed by the force, so it get's some OK, we apply force for the first time to the object that is NOT MOVING (doesn't have velocity) and NO FORCES are acting on it. It will ONLY stop when we apply a counteracting force on it (in the opposite direction of the moving object).īut what will happen if we apply a force continuously to it? Well, it will have acceleration. There is nothing stopping it from moving, and there is nothing accelerating it. When there are no forces acting on an object, there is no acceleration or deacceleration - and the object won't change it's velocity. At the moment we applied the force, the object gained some velocity, it had acceleration in that moment - from 0 to v (where "v" is the current velocity). We applied ONLY ONE FORCE ONLY ONCE (for a tiny moment). Now, it has velocity, and no forces are acting on it - because The force, when applied, gives it velocity. NO FORCES acting on it, this object gets pushed or pulled. If ONLY one force is applied ONCE (only one time, for a really small moment) to an object with You have some problems because of some misconceptions about Force, Acceleration and Velocity. My answer with explanation of some common misconceptions. If AddForce is actually applied over a length of time, that information will be just as helpful as a formula. The way I understand it, AddForce is an instant, one-time force, and doesn't have a length of time associated with it. Ive tried looking for actual physics formulas, but they seem to all need acceleration or the length of time that the force is applied. With the vector notation indicating that the net external force is in the same direction as acceleration."Does anyone know how to calculate the velocity of an object of a given, constant mass after using AddForce? There is no resistance on the rigidbody, and the use gravity box is unchecked (doesn't use gravity from the physics engine).
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