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### Course: Pixar in a Box>Unit 7

Lesson 2: The physics of particle systems

# Understanding net forces

When multiple forces are acting on a particle we need to express them as a single force known as a net force. To find the net force, add all forces using vector addition. Net force determines the direction of acceleration.

## Want to join the conversation?

• Can you use net forces in JavaScript?
• You can certainly represent forces in Javascript and calculate what the net force would be when you combine them.
• Would it matter what order you put the forces on when using the head to tail method?
• No. Adding forces is like adding numbers - it doesn't matter what order you do it in. The mathematical term for this is commutative.
• what even is a net force? well I didn't fully pay attention and I'm in 4th grade.
• A net force gives the direction a particle is moving, when more than one force is acting upon it. To find a net force, you must add all the forces together, as it states at in the video.
• What Is The Direction Of The Net Force When One Force Is Pulling Down And One Force Is Pushing To The Right?
• which software is used there
• Say the force of wind is 5 units and the force of gravity is 7 units, would you add the two unit measurements to get 12? And would the length of the net force be 12 units? I'm just confused on how you would find the length of the net force.