It’s leg day at the gym and you’re working on knee extension exercises. Using the figure below and the Leipzig anthropometric tables in the textbook, calculate the quadriceps muscle force and the reaction force at the knee joint. Consider the added mass of the thigh and shank, but the ankle may be ignored. The person is 5’6” and weighs 165 lbs and is lifting 100 lbs on the knee extension machine. You may also assume that the person’s leg is not resting on the chair.

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Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.