Unity PhysX: Rigid Body Physics Quiz and Flashcards

What component can be assigned to GameObjects in Unity to configure them as rigid bodies?

Which type of body does not deform or change shape under physics forces?

What does the Rigidbody component provide in Unity for controlling the movement and position of a GameObject?

When should the Rigidbody properties be used to move a GameObject in Unity?

In Unity, which component represents a rigid body in the API?

What happens if you change the Transform directly on a GameObject with a Rigidbody in Unity?

What is the primary class used to add forces to a GameObject in Unity?

What property of the Rigidbody component defines a GameObject as non-physics-based and removes it from the control of the physics engine?

What type of motion in Unity is not physics-based?

When does Unity set a Rigidbody to 'sleep'?

What happens when a Rigidbody receives a collision or force while it is 'sleeping'?

What can a kinematic Rigidbody do when colliding with a Rigidbody that has physics-based movement?

What behavior is controlled by the Is Kinematic property of a Rigidbody?

What method can be used to wake up a 'sleeping' Rigidbody?

Which class is used to apply torque to a GameObject in Unity?

Rigid Bodies in Unity

The Rigidbody component can be assigned to GameObjects in Unity to configure them as rigid bodies, which do not deform or change shape under physics forces.
The Rigidbody component provides a way to control the movement and position of a GameObject, allowing for physics-based simulation.

Rigidbody Properties and Movement

Rigidbody properties should be used to move a GameObject in Unity when physics-based movement is required, such as when applying forces, torques, or velocities.
If the Transform is changed directly on a GameObject with a Rigidbody, it will be overridden by the physics engine, leading to unexpected behavior.

API and Forces

The Rigidbody class represents a rigid body in the Unity API.
The primary class used to add forces to a GameObject is the Rigidbody class.
The AddTorque method of the Rigidbody class is used to apply torque to a GameObject.

Kinematic Rigid Bodies

A kinematic Rigidbody is a type of Rigidbody that has non-physics-based movement, allowing it to move without being affected by the physics engine.
The Is Kinematic property of a Rigidbody defines a GameObject as non-physics-based and removes it from the control of the physics engine.
A kinematic Rigidbody can move and collide with a Rigidbody that has physics-based movement, but it will not be affected by the collision.

Sleep and Wake

Unity sets a Rigidbody to 'sleep' when it has come to rest and is no longer moving or colliding with other objects.
If a Rigidbody receives a collision or force while it is 'sleeping', it will be 'woken up' and begin to move and respond to physics forces again.
The Rigidbody can be manually woken up using the WakeUp method.

Learn about simulating physics-based behavior such as movement, gravity, collision, and joints by configuring GameObjects as rigid bodies in Unity’s PhysX system.