# Posts

### Screws (Part 4): The Kinetic & Dynamic Screws of a Material System

In this post, we define two new screws fundamental to describe the laws of motion of material systems.

### Screws (Part 3): Application to Mechanisms

In this post, we apply basic screw theory to the kinematic analysis of mechanisms.

### Screws (Part 2): Application to Kinematics

In this post, we apply basic screw theory to rigid body kinematics.

### Screws (Part 1): A Powerful Tool for Rigid Body Mechanics

This is the first of several posts on the topic of screws which is not particularly known in the US engineering community.

### Freefall Without Secured Rope

A spectacular video entitled Freefall Without Secured Rope'' (Fritt fall uten sikret tau) is well worth watching: In a carefully …