7. Imrestigate: In the DESIGN tab, the white crcles represent the insertion point of the tendons,where they connect the muscles to the bone. Use the Gizno to see how the location of the nsertion point affects the amount of mass that can be lifted. A What do you find?The farther the tendon is placed, the easier the weight will be litted while the shorter the tendon is placed from the forearm makes it harder for the weight to be litted B. Why do you think the location of the Insertion point has this effect? __ __ C. Note how far the arm lifts the weight What is a disadvantage of moving the Insertion point farther from the elbow? __ In an actual hum an arm, the insertion point is close to the elbow, allowing for a greater range of motion

7. Investigate: In the DESIGN tab, the white circles represent the insertion point of the tendons, where they connect the muscles to the bone. Use the Gizmo to see how the location of the insertion point affects the amount of mass that can be lifted.<br /><br />A. What do you find? The farther the tendon insertion point is from the elbow joint, the easier it is to lift the weight. Conversely, the closer the tendon insertion point is to the elbow, the harder it is to lift the same weight.<br /><br />B. Why do you think the location of the insertion point has this effect? This is due to the principle of leverage. When the insertion point is farther from the elbow, the tendon acts on a longer lever arm. This means the muscle needs to exert less force to produce the same torque (rotational force) on the forearm, making it easier to lift the weight. When the insertion point is closer to the elbow, the lever arm is shorter, requiring the muscle to exert a greater force to achieve the same torque, making lifting more difficult. Think of it like using a wrench: a longer wrench makes it easier to loosen a bolt.<br /><br />C. Note how far the arm lifts the weight. What is a disadvantage of moving the insertion point farther from the elbow? While placing the insertion point farther from the elbow increases the lifting power, it reduces the range of motion of the forearm. The muscle has to contract a shorter distance to move the hand the same distance. This means the hand won't be able to move as far. In an actual human arm, the insertion point being close to the elbow allows for a greater range of motion, even though it requires more muscular force for lifting. This range of motion is crucial for tasks requiring dexterity and flexibility.<br />