Picture Taken By: Ahsan Iqbal, 15/02/2009Hello again guys, this week I am going to talk about a step ladder that has two extendable lengths for more convenient storage, the lengths can be slid together for storage or slid apart to maximize the length of the ladder. It also has a small horizontal platform at the top. The ladder is hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle providing support each end and helping it not to tip over. The ladder is in static equilibrium as the sum of all the horizontal and vertical forces acting on the ladder is equal to zero and the moment about at any point along the ladder is also zero. The most interesting thing is the friction at the ends of the ladder. Friction force is large enough to prevent it from slipping.
Material selection plays a major role in the structure of the objects under stress. In the case of ladder, material used is aluminum that is light weight, soft, durable and malleable metal. Aluminum is able to withstand the extensive stresses on the structure of ladder and hence is makes it safe for use.
No comments:
Post a Comment