Why physics simulate realistic behavior in Unity - Test Your Understanding

Practice - 5 Tasks

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easy

Complete the code to manually apply gravity to a Rigidbody component in Unity each FixedUpdate.

Unity

rigidbody.[1] += Physics.gravity * Time.fixedDeltaTime;

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AangularVelocity

Bvelocity

Cdrag

Dmass

Attempts:

3 left

💡 Hint

Common Mistakes

Using mass instead of velocity to apply gravity.

Trying to set drag to gravity value.

In Unity, to manually simulate realistic gravity in FixedUpdate, you add Physics.gravity * Time.fixedDeltaTime to the Rigidbody's velocity property.

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medium

Complete the code to add a force to a Rigidbody to simulate a push.

Unity

rigidbody.AddForce([1] * forceAmount);

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AVector3.forward

BVector3.one

CVector3.zero

DVector3.up

Attempts:

3 left

💡 Hint

Common Mistakes

Using Vector3.zero which applies no force.

Using Vector3.up which pushes upward.

Using Vector3.forward applies force in the forward direction, simulating a push.

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hard

Fix the error in the code to correctly simulate friction on a Rigidbody.

Unity

PhysicMaterial material = new PhysicMaterial();
material.dynamicFriction = [1];
rigidbody.sharedMaterial = material;

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A"high"

B5

C0.5f

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using an integer instead of a float.

Using a string or boolean value.

The dynamicFriction property expects a float value like 0.5f, not an integer or string.

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hard

Fill both blanks to create a dictionary that maps object names to their Rigidbody mass if mass is greater than 1.

Unity

if (rigidbody.[2] > 1f) {
  var heavyObjects = new Dictionary<string, float> { { [1], rigidbody.[2] } };
}

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A"Player"

Bmass

Cvelocity

D"Enemy"

Attempts:

3 left

💡 Hint

Common Mistakes

Using velocity instead of mass.

Using a variable instead of a string for the key.

We use the object name as a string key and the Rigidbody's mass property as the value.

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hard

Fill all three blanks to create a dictionary comprehension that maps object names to their velocity if velocity magnitude is greater than 2.

Unity

if (rigidbody.[3].magnitude > 2f) {
  var fastObjects = new Dictionary<string, Vector3> { { [1], rigidbody.[2] } };
}

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A"NPC"

Bvelocity

D"Ally"

Attempts:

3 left

💡 Hint

Common Mistakes

Using different properties for value and condition.

Using incorrect string keys.

The dictionary key is the object name string, and the value is the Rigidbody's velocity. The condition checks velocity magnitude.