In this situation the motives of the defendant and the reasonableness of their conduct are the factors used to determine the unreasonableness of their actions. This is one of the few exceptions to the rule that malice is not relevant in tort law. In Christie v Davey, the defendant was deliberately creating a noise to frustrate the claimants; based on this, it was held that their actions were malicious, unreasonable, and amounted to a nuisance.
A fixed pulley has a mechanical advantage of one, however, it is able to change the direction of force on an object. A movable pulley has a mechanical advantage of two and is connected to the object being moved.A block and tackle pulley provides a mechanical advantage of three and is made up of fixed and movable pulleys. Calculating the mechanical advantage of a pulley:ith a pulley, the user pulls one end of the rope and the other end of the rope pulls up on the object you want to move. The force produced by the user of the pulley is called the input force and the force pulling up on the object is called the output force.
Calculating Forces in the Pulley Mechanical Advantage Systems Used in Rescue Work By: Ralphie G. Schwartz, Esq. Introduction If you have not read the companion article: Understanding Mechanical Advantage in the Single Sheave Pulley Systems Used in Rescue Operations , it is recommended that you do so before beginning this one. It explains the means by which a pulley can double its input force, examines common examples of both simple and compound rope and pulley MA (mechanical advantage) systems, and explains how to calculate mechanical advantage ratios in those systems. One of the key points emphasized in that piece is that pulleys are force magnifiers wherever they are attached, be it the rescue load or the anchor system.