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The first law of motion

From: 2D Character Animation

Video: The first law of motion

Anyone involved in animation needs to understand how objects move and the way that objects move are defined by the laws of motion. Now these laws were developed a couple hundred years ago by a man named Sir Isaac Newton and he has three fundamental Laws of Motion. So, we are going to go through those and see how they apply to animation. Now Newton's first Law of Motion in his own words was "a body persists in its state of being at rest or of moving uniformly straightforward, except insofar as it is compelled to change its state by force impressed." Well that's 17th century English.

The first law of motion

Anyone involved in animation needs to understand how objects move and the way that objects move are defined by the laws of motion. Now these laws were developed a couple hundred years ago by a man named Sir Isaac Newton and he has three fundamental Laws of Motion. So, we are going to go through those and see how they apply to animation. Now Newton's first Law of Motion in his own words was "a body persists in its state of being at rest or of moving uniformly straightforward, except insofar as it is compelled to change its state by force impressed." Well that's 17th century English.

So, let's just go ahead and state this in just regular plain old English and the first part of this law is an object that is not moving will remain still until a force acts upon it, and the second part of this law is an object that is moving will not change its velocity until a force acts upon it. Now the fundamental point of this law is that you need force to put something in motion. So, let's take a look at this in practice.

Now, here we have an object at rest. It's just a simple ball. Now in order to get this moving we need to apply a force and once that force is applied, it will start to move that object from rest and then accelerate it. In fact, let's just go ahead and play this and see how it works. So, once the force is applied, it starts pushing the object and moving it. Now the longer the force is applied, the more the object accelerates and the faster it goes.

Now, the second part of this law is an object that is moving will not change its velocity until a force acts upon it. So, let's go ahead and take a look at an object that is moving. Now when an object is moving with no force applied, it moves in equal steps per unit of time. In fact I have marked these out. So as this object moves, you can see that it's moving equal distance per unit of time. Now, once we apply a force to that it will change its direction.

Now, let's look at this with a force applied. Now the ball is moving in a constant direction. Now as soon as the force is applied here, the path of the ball changes. So, it continues to move forward but the force pushes it in a different direction. So again, the object will not change its velocity or its direction until a force is applied. So typically, an object in motion will tend to stay in motion until a force is applied and an object at rest will remain at rest until a force is applied.

Now the important thing to remember about this first law is forces create motion.

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This video is part of

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2D Character Animation

73 video lessons · 21954 viewers

George Maestri
Author

 
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  1. 2m 18s
    1. Introduction
      1m 2s
    2. Using the exercise files
      1m 16s
  2. 48m 21s
    1. Designing characters
      3m 22s
    2. Tracing characters
      4m 32s
    3. Creating joints that work
      3m 53s
    4. Working with outlines
      4m 0s
    5. Accessorizing your characters
      2m 21s
    6. Creating parts for replacement animation
      1m 41s
    7. Rigging hierarchies in After Effects
      5m 33s
    8. Rigging replacement animation in After Effects
      5m 52s
    9. Rigging with the Puppet tool in After Effects
      3m 16s
    10. Rigging Flash characters
      5m 50s
    11. Rigging replacement animation in Flash
      4m 25s
    12. Rigging with the Bone tool in Flash
      3m 36s
  3. 55m 29s
    1. The first law of motion
      3m 3s
    2. The second law of motion
      3m 45s
    3. The third law of motion
      3m 19s
    4. Using slow in and slow out
      5m 34s
    5. Arcs and smooth motion
      5m 4s
    6. Understanding overlap and follow-through
      5m 16s
    7. Animating overlap and follow-through
      5m 46s
    8. Understanding squash and stretch
      3m 10s
    9. Animating squash and stretch
      4m 40s
    10. Squashing and stretching characters
      5m 16s
    11. Understanding weight
      3m 27s
    12. Understanding anticipation
      4m 54s
    13. Animating anticipation and weight
      2m 15s
  4. 45m 50s
    1. Internal vs. external forces
      4m 45s
    2. Bringing characters to life
      4m 57s
    3. Animating blinks
      4m 37s
    4. Animating changes in eye direction
      2m 43s
    5. Animating head turns
      8m 1s
    6. Creating a strong line of action
      4m 16s
    7. Creating strong silhouettes
      2m 19s
    8. Pose-to-pose animation: Blocking
      4m 32s
    9. Pose-to-pose animation: Animating
      4m 21s
    10. Pose-to-pose animation: Finalizing
      5m 19s
  5. 46m 53s
    1. A walk in four poses
      2m 27s
    2. Motion of the head and body
      1m 32s
    3. Walk cycles and backgrounds
      1m 40s
    4. Skeleton motion and walking
      4m 2s
    5. Animating a walk: Contact position
      3m 0s
    6. Animating a walk: The feet
      9m 10s
    7. Animating a walk: The body
      5m 19s
    8. Animating a walk: The legs
      8m 21s
    9. Animating a walk: The upper body and arms
      3m 46s
    10. Animating a walk: The head
      2m 50s
    11. Animating a walk: Squash and stretch
      4m 46s
  6. 26m 52s
    1. A run in four poses
      4m 10s
    2. Animating a run: First pose
      4m 39s
    3. Animating a run: Second pose
      3m 45s
    4. Animating a run: Third pose
      3m 27s
    5. Animating a run: Fourth pose
      5m 1s
    6. Animating a run: Upper body
      5m 50s
  7. 37m 6s
    1. The basics of dialogue animation
      4m 35s
    2. Reading tracks and assigning mouth shapes
      5m 33s
    3. Phonemes and lip-syncing
      8m 36s
    4. Animating dialogue: Animating the body
      6m 27s
    5. Animating dialogue: Assigning mouth shapes
      4m 10s
    6. Animating dialogue: Finalizing
      7m 45s
  8. 1h 27m
    1. Animating a scene
      2m 0s
    2. Setting up the scene in After Effects
      3m 2s
    3. Animating the feet in After Effects
      10m 40s
    4. Animating the legs in After Effects
      4m 21s
    5. Animating the upper body in After Effects
      9m 44s
    6. Animating the mouth and blinks in After Effects
      7m 5s
    7. Setting up the scene in Flash
      4m 6s
    8. Animating the feet in Flash
      9m 0s
    9. Animating the body in Flash
      5m 23s
    10. Animating the legs in Flash
      7m 24s
    11. Animating the hands in Flash
      11m 54s
    12. Animating the mouth in Flash
      12m 26s
  9. 33s
    1. Goodbye
      33s

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