2D Game Development 2D Physics and Collision Detection 2

Question 1

What is the difference between dynamic and static rigidbodies in 2D physics?

Accepted Answer

Dynamic bodies move and respond to forces; static bodies do not move

Answer

Dynamic rigidbodies are affected by forces and gravity, while static rigidbodies remain fixed and serve as immovable terrain.

Question 2

What does 'friction' in a 2D physics engine control?

Accepted Answer

How quickly an object stops when sliding

Answer

Friction is the resistance force applied to an object sliding along a surface, determining how quickly it decelerates.

Question 3

What is a 'kinematic' rigidbody in 2D game engines?

Accepted Answer

A body moved by code without being affected by physics forces

Answer

Kinematic rigidbodies are moved directly via code (e.g., velocity or position) and are not affected by gravity or external forces.

Question 4

What is the Separating Axis Theorem (SAT) used for in 2D games?

Accepted Answer

Detecting collisions between convex shapes

Answer

SAT determines if two convex shapes are overlapping by checking if a separating axis exists between them.

Question 5

What is impulse resolution in 2D physics?

Accepted Answer

Applying an instant velocity change to resolve a collision

Answer

Impulse resolution applies an instantaneous change in velocity to both colliding objects to separate them and simulate realistic bouncing.

2D Game Development Practice Test