The other two ForceModes, Acceleration and Velocit圜hange, are even simpler because they leave mass out of the equation.Īcceleration is calculated as: Acceleration = Force * Time ^ 2 That's because Force treats your force input as force per second, whereas Impulse treats your force input as force per timestep. Notice that 0.4 is exactly 50 * 0.008 (50 being the default number of timesteps in a second). Thus if the object has a mass of 2, you apply a force of 40 and the fixed timestep is left at the default of 0.02, it will look like this: Acceleration = 40 * 0.02 / 2 Impulse is calculated as: Acceleration = Force * Time / Mass In other words, it will accelerate by 0.008m/s. So the object will gain 0.008 metres per second of velocity. Thus if the object has a mass of 2, you apply a force of 40 and the fixed timestep is left at the default of 0.02, it will look like this: Acceleration = 40 * (0.02 * 0.02) / 2
UNITY STRENGTH OF AN IMPULSIVE FORCE HOW TO
The real difference is that Force treats the force parameter as Newtons and Impulse treats the force parameter as Newton-seconds, but we don't need to understand that to have a good understanding of how to use the function.įorce is calculated as: Acceleration = Force * Time ^ 2 / Mass Longer Explanation (for maximum understandings) If you do Force once every FixedUpdate for exactly one second, you will have applied the same amount of total force as doing Impulse on just one frame. There's no actual difference in the way Force and Impulse apply the forces, only in how they calculate the amount of force to apply. Tl dr (.or "The Boy That Couldn't Be Bothered") ForceMode.Force = Force per second Incidentally: The official documentation could do with a better explanation since the current explanation in the docs is crappy and doesn't actually tell you anything unless you do the maths yourself, and even then the maths alone doesn't tell you everything about the function. Since no one has yet managed to explain it clearly, here's my attempt from the viewpoint of someone who's only just figured it out. It's actually really simple, but everyone makes it sound so complicated that you assume it's more complicated than it really is.
Instantly I realised I understood the differences. After a short while, one phrase jumped out at me: Think of it as 'Force exerted per second' After staring at the formulae for a long time and not really getting anywhere, I decided to stare at the page linked by (thanks btw!). Ok, so more than a year later I've had the need to come back and attempt to fully understand this problem (as I never really understood what the differences were).
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