Find a barbell or other object with a weight of 5 lbs. or more. a. Hold the object with your forearm parallel to the floor and with your elbow making a SID-degree angle. Which muscle is tense, your biceps or triceps? is that muscle pulling up or pushing down? See the diagram for a simplified model of this situation. Using the forearm as the system of interest, estimate the force that the biceps muscle exerts on the forearm. What assumptions did you make in order to accomplish the goal