Motion described by differential equations

In summary, the conversation discusses two differential equations derived from constraints on a system's motion, specifically in relation to classical mechanics. The equations are not provided, but the conversation mentions the use of constraints and assumptions, and the lack of understanding of how the equations were derived. The request is made for the equations to be typed out instead of being posted as a sideways photo.
  • #1
diredragon
323
15

Homework Statement


Text from a classical mechanics textbook ( uploaded picture ) shows 2 diff equation describing the motion graphically presented in the uploaded picture. How were these set up?

Homework Equations

The Attempt at a Solution


I don't have a slightest clue as how are these equations derived in the first place.
 

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  • #2
diredragon said:

Homework Statement


Text from a classical mechanics textbook ( uploaded picture ) shows 2 diff equation describing the motion graphically presented in the uploaded picture. How were these set up?

Homework Equations

The Attempt at a Solution


I don't have a slightest clue as how are these equations derived in the first place.

They can be derived from the constraints on the system.

If it's moving on a plane, z is constant.
It's perpendicular to the plane.
It remains perpendicular to the plane.
And we can assume it's rolling without slipping.

You can re-derive everything from those four constraints.
 
  • #3
So how exactly did they get to those two diff equations? The book just wrote them down. And its the first time I am hearing about constraints, read it a while ago though...
 
  • #4
diredragon said:

Homework Statement


Text from a classical mechanics textbook ( uploaded picture ) shows 2 diff equation describing the motion graphically presented in the uploaded picture. How were these set up?

Homework Equations

The Attempt at a Solution


I don't have a slightest clue as how are these equations derived in the first place.

Please type out the equations; posting sideways-oriented photos will not bring you responses from most helpers.
 

1. What is "Motion described by differential equations"?

"Motion described by differential equations" refers to the mathematical model used to describe the motion of an object in terms of its position, velocity, and acceleration. Differential equations are used to represent the relationships between these variables and how they change over time.

2. How are differential equations used in describing motion?

Differential equations are used to describe motion by relating the position, velocity, and acceleration of an object. By solving these equations, we can determine the exact mathematical function that describes the motion of the object.

3. What types of motion can be described by differential equations?

Differential equations can be used to describe various types of motion, such as linear motion, circular motion, and oscillatory motion. They can also be used to describe the motion of objects under the influence of external forces, such as gravity or friction.

4. Why are differential equations important in studying motion?

Differential equations are important in studying motion because they provide a precise mathematical model for describing how an object moves. They allow us to make predictions about an object's future position and behavior, and they can also be used to design and control motion in various systems.

5. Is it necessary to use differential equations to describe motion?

While it is possible to describe motion using other mathematical models, differential equations are often the most accurate and efficient method. This is because they take into account all the factors that affect an object's motion and can provide precise solutions to complex motion problems.

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