Rigidbody 3D component in Unity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the Rigidbody 3D component in Unity?

The Rigidbody 3D component makes a GameObject respond to physics forces like gravity, collisions, and other physical interactions.

beginner

How do you make a Rigidbody 3D object stop moving in Unity?

You can set the Rigidbody's velocity to zero or use Rigidbody's isKinematic property to stop physics simulation on the object.

beginner

What does the useGravity property do in a Rigidbody 3D component?

The useGravity property controls whether the Rigidbody is affected by gravity. If true, gravity pulls the object down; if false, it floats.

intermediate

Explain the difference between isKinematic set to true and false on a Rigidbody 3D.

isKinematic = true means the Rigidbody is controlled by script and ignores physics forces. isKinematic = false means physics forces like collisions and gravity affect the Rigidbody.

beginner

How can you apply a force to a Rigidbody 3D to make it move?

Use the Rigidbody's AddForce(Vector3 force) method to push or pull the object in a direction.

What happens if you disable useGravity on a Rigidbody 3D?

A The object will freeze in place.

B The object will not be pulled down by gravity.

C The object becomes invisible.

D The object will move faster.

Disabling useGravity means gravity no longer affects the Rigidbody, so it won't fall.

Which property makes a Rigidbody ignore physics forces and be controlled only by scripts?

A useGravity

B mass

C isKinematic

D drag

isKinematic set to true disables physics forces on the Rigidbody.

How do you stop a Rigidbody 3D from moving immediately?

A Set velocity to zero

B Increase mass

C Disable gravity

D Change color

Setting velocity to zero stops the Rigidbody's movement instantly.

What method do you use to push a Rigidbody 3D in a direction?

A Translate

B SetActive

C Rotate

D AddForce

AddForce applies a physical force to move the Rigidbody.

If isKinematic is false, what affects the Rigidbody?

A Physics forces like gravity and collisions

B Only script commands

C Nothing affects it

D It becomes invisible

When isKinematic is false, physics forces control the Rigidbody.

Describe how the Rigidbody 3D component controls an object's movement in Unity.

Think about how physics and scripts affect the object.

Explain the difference between using isKinematic true and false on a Rigidbody 3D.

Consider when the object moves by physics or by your code.