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.
1 Mechanical advantage is gained by combining a fixed pulley with a movable pulley or another fixed pulley of a different diameter. 2  Movable: A movable pulley has an axle in a movable block. 3  A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two.hus, the mechanical advantage is three. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle.