Momentum and Energy
Dynamics is a subset of mechanics, which is the study of motion. Whereas kinetics studies that motion itself, dynamics is concerned about the CAUSES of motion. In particular, it involves the concepts of force, momentum and energy. This video gives an overview of what dynamics is, and is useful as an intro to its study, or as a review
Momentum and energy are intricately connected to the concept of force. In fact in Newton's Principia he described his second law of motion in terms of momentum.
In classical physics the concept of momentum is relatively straightforward. It's simply an object mass times its velocity. So for example a heavy object if moving will have a large momentum due to its mass. But I like object can also have a large momentum if it's velocity is particularly high. So for example a bullet can have a relatively large momentum by way of its velocity.
The concept of energy took a little bit more time to develop. In essence, it's the ability to do work.The concept of energy took a little bit more time to develop. In essence, it's the ability to do work. In the context of classical mechanics, this energy could be related to an object in motion or its position in a field.
Although they are intimately connected we are going to discuss them separately below, at least initially.
In classical physics the concept of momentum is relatively straightforward. It's simply an object mass times its velocity. So for example a heavy object if moving will have a large momentum due to its mass. But I like object can also have a large momentum if it's velocity is particularly high. So for example a bullet can have a relatively large momentum by way of its velocity.
The concept of energy took a little bit more time to develop. In essence, it's the ability to do work.The concept of energy took a little bit more time to develop. In essence, it's the ability to do work. In the context of classical mechanics, this energy could be related to an object in motion or its position in a field.
Although they are intimately connected we are going to discuss them separately below, at least initially.