Show all work. 1. 4 ft The truss system is loaded as shown. Assume that supprts A and K are both anchored frictionless pins. a. Is the truss stable and statically determinate? Show work. b. K c. d. Find the support reactions at A and K. Hint: what do we know about ideal truss members that lets us find all of the support reactions. Identify any obvious zero force members and state why each is. If none, state none. Using the method of joints only, find the forces in all other truss members, and indicate whether each is in compression or tension. G B D |-31-+ F30 F30 -3 ft--3 ft--3 ft--3ft--3ft- 1500 lb E 1500 lb F I

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.