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What is a Rigidbody?

Learn the role of the Rigidbody component in physics simulation.

What is a Rigidbody?

The Rigidbody component enables a GameObject to be governed by Unity's physics engine (Nvidia PhysX). Adding this component allows the object to move realistically according to gravity, friction, and acceleration.

// Accessing Rigidbody and enabling gravity
Rigidbody rb = GetComponent<Rigidbody>();
rb.useGravity = true;

Objects lacking a Rigidbody are treated as static and cannot be pushed or dropped by physics forces.

Mass and Kinematic settings

The mass property on a Rigidbody defines its weight in kilograms. When isKinematic is set to true, the object ignores physics forces and only moves via script or animation.

rb.mass = 2.5f;
rb.isKinematic = false;

For example, a moving elevator platform typically uses isKinematic = true so it does not wobble from physical impacts.

Practice Print Rigidbody state

Assign 3 to mass and "Enabled" to gravity. Print Rigidbody Mass: 3 | Gravity: Enabled to the console.

Starter code

Player.cs
using System;

class Program
{
    static void Main()
    {
        // mass ve gravity değerlerini tanımlayıp yazdır
    }
}

Sample solution

Player.cs
using System;

class Program
{
    static void Main()
    {
        int mass = 3;
        string gravity = "Enabled";
        Console.WriteLine("Rigidbody Mass: " + mass + " | Gravity: " + gravity);
    }
}

Expected output

Rigidbody Mass: 3 | Gravity: Enabled

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What is the primary role of the Rigidbody component in Unity?

  • Granting gravity, mass, and physics simulation capabilities to an object Correct answer
  • Playing background audio files in an infinite loop
  • Calculating the brightness angle of scene light sources
  • Only changing the 2D UI pixel resolution of an object

Explanation: Rigidbody brings the object into the physics calculation cycle, providing mass and gravity.

2 Enable gravity

Question 
rb.____ = true;
Answer 
rb.useGravity = true;

Explanation: The useGravity boolean property on Rigidbody is used to toggle gravity.

3 Rigidbody properties

Term Meaning
Rigidbody Manages physics simulation — component
mass Object mass in kilograms
useGravity Toggles gravity effect — property
isKinematic Exempts object from physics forces

All lessons in Beginner

1 What is game development?

  1. Intro to game development
  2. Game engines
  3. 2D and 3D games
  4. The game loop
  5. The scene concept
  6. Summary - Game dev fundamentals

2 Unity setup

  1. Installing Unity Hub
  2. Creating your first project
  3. The editor interface
  4. Toolbar and playback
  5. Saving the project
  6. Summary - Unity setup

3 First scene project

  1. Project overview
  2. Camera and light
  3. Your first cube in the scene
  4. Adding a material
  5. Testing in Play mode
  6. Summary - First scene

4 The GameObject concept

  1. What is a GameObject?
  2. Components
  3. The Hierarchy window
  4. Editing with the Inspector
  5. Tags and Layers
  6. Summary - GameObject

5 C# script basics

  1. Your first C# script
  2. using and namespace
  3. Class structure
  4. Variables and types
  5. Output with Debug.Log
  6. Summary - C# basics

6 MonoBehaviour

  1. What is MonoBehaviour?
  2. The Start method
  3. The Update method
  4. Awake vs Start
  5. SerializeField and public
  6. Summary - MonoBehaviour

7 Transform

  1. What is Transform?
  2. Changing position
  3. Moving with Translate
  4. Changing rotation
  5. Local vs world space
  6. Summary - Transform

8 Input

  1. The Input class
  2. Axis input
  3. Mouse input
  4. The new Input System
  5. Movement vector
  6. Summary - Input

9 Physics (Rigidbody/Collider)

  1. What is a Rigidbody?
  2. What is a Collider?
  3. Applying force with AddForce
  4. Collision events
  5. Trigger events
  6. Summary - Physics

10 2D Sprite

  1. What is a Sprite?
  2. SpriteRenderer
  3. Sprite import settings
  4. Sprite sorting
  5. Preparing sprite animation
  6. Summary - 2D Sprite

11 Godot basics

  1. The Godot editor
  2. A new project
  3. The scene tree
  4. The Node concept
  5. Saving the project
  6. Summary - Godot basics

12 GDScript

  1. What is GDScript?
  2. extends and variables
  3. Function definition
  4. Output with print
  5. Type hints
  6. Summary - GDScript

13 Node and Scene

  1. Node2D and Sprite2D
  2. Saving a scene
  3. Scene instance
  4. The _ready method
  5. The _process method
  6. Summary - Node and Scene

14 Beginner final

  1. Challenge 1: Print a score
  2. Challenge 2: Movement vector
  3. Challenge 3: Godot ready
  4. Challenge 4: Collision log
  5. Challenge 5: Final synthesis