A level PE – Levers Questions and Answers Latest Update Graded A+

A level PE – Levers Questions and Answers Latest Update Graded A+ What is a lever in biomechanics? A lever is a rigid bar that rotates around a fixed point called the fulcrum, used to increase force or speed in a mechanical system. What are the three classes of levers? The three classes of levers are first-class, second-class, and third-class levers, classified based on the relative positions of the effort, load, and fulcrum. What is a first-class lever, and where is the fulcrum located? A first-class lever has the fulcrum located between the effort and the load, like a seesaw or crowbar. How does a second-class lever work, and can you give an example? In a second-class lever, the load is located between the effort and the fulcrum, providing mechanical advantage, like a wheelbarrow. 2 What is the main characteristic of a third-class lever? In a third-class lever, the effort is applied between the load and the fulcrum, like a pair of tongs or the forearm during a bicep curl. How do levers increase force or speed? Levers can increase force by using a longer effort arm, or they can increase speed by shortening the effort arm, depending on the lever class. How does the length of the effort arm affect the mechanical advantage in levers? A longer effort arm increases the mechanical advantage by allowing more force to be applied over a longer distance. What is mechanical advantage in the context of levers? Mechanical advantage refers to the ratio of the effort arm to the load arm, indicating how much a lever amplifies force or speed. Why is the bicep curl an example of a third-class lever? In a bicep curl, the effort (force from the bicep) is applied between the elbow (fulcrum) and the hand (load), making it a third-class lever. 3 How does a first-class lever improve the efficiency of a movement? A first-class lever can change the direction of force, such as in the head-neck movement, where the fulcrum is at the base of the skull and the muscles provide the effort. What is the importance of the fulcrum in a lever system? The fulcrum is the pivot point around which the lever rotates, and its position determines the type of lever and its mechanical advantage. Can you give an example of a second-class lever in the human body? An example of a second-class lever in the human body is the calf muscle during a toe raise, where the ball of the foot acts as the fulcrum, the load is the body weight, and the effort comes from the calf muscles. How does the effort required change as the effort