The default gravity settings assume that one world unit corresponds to one metre of distance. This is actually due to the scale used for your models. FixedUpdate is called immediately before each physics update and so any changes made there will be processed directly.Ī common problem when starting out with Rigidbodies is that the game physics appears to run in 'slow motion'. The reason for this is that physics updates are carried out in measured time steps that don't coincide with the frame update. In a script, the FixedUpdate function is recommended as the place to apply forces and change Rigidbody settings (as opposed to Update, which is used for most other frame update tasks). Given this information, the physics engine can handle most other aspects of the car's motion, so it will accelerate realistically and respond correctly to collisions. For example, a car's behaviour can be specified in terms of the forces applied by the wheels. The Rigidbody also has a scripting API that lets you apply forces to the object and control it in a physically realistic way. Even without adding any code, a Rigidbody object will be pulled downward by gravity and will react to collisions with incoming objects if the right Collider component is also present. Adding a Rigidbody component to an object will put its motion under the control of Unity's physics engine.
