Question 1: Define a lever and explain its three main parts: effort, fulcrum, and load.

Answer: A lever is a rigid bar that pivots around a fixed point called the fulcrum, used to move a load with less effort. The three main parts are: effort (force applied), fulcrum (pivot point), and load (the object being moved).

Question 2: Identify the type of lever in the human body when you perform a bicep curl and justify your answer.

Answer: It is a third-class lever because the effort (muscle contraction) is applied between the fulcrum (elbow joint) and the load (hand holding the object).

Question 3: Describe how a first-class lever works using an example from sports or daily life.

Answer: A first-class lever has the fulcrum in the middle, with effort on one side and load on the other. An example is a seesaw, where the fulcrum is in the center, effort is applied at one end, and the load is on the opposite end.

Question 4: Explain the advantage of using a lever in physical activity.

Answer: Levers amplify the force applied, making it easier to move or lift heavy objects or perform certain movements with less effort, improving efficiency and reducing fatigue.

Question 5: Identify which type of lever is used when a person pushes against a wall with their hand, and explain why.

Answer: It is a second-class lever because the load (the part of the hand pushing) is between the effort (muscle force) and the fulcrum (wrist joint).

Question 6: Draw a diagram of a third-class lever in the human arm performing a bicep curl. Label the effort, fulcrum, and load.

Answer: A correct diagram should show the fulcrum at the elbow joint, effort applied by the bicep muscle at a point closer to the load, which is the hand holding an object. The effort is between the fulcrum and the load.

Question 7: Describe the mechanical advantage of a lever and how it relates to sports movements.

Answer: Mechanical advantage is the ratio of effort to load. A lever with a higher mechanical advantage reduces the effort needed to move a load, which is beneficial in sports for powerful or efficient movements.

Question 8: Identify the type of lever used when a person performs a neck extension by tilting their head backward, and explain your reasoning.

Answer: It is a first-class lever because the fulcrum is at the neck joint, effort is applied by neck muscles at one side, and the load (head) is on the other side.

Question 9: Explain how the length of the effort arm and load arm affects the efficiency of a lever.

Answer: A longer effort arm allows for less effort to move a load, increasing efficiency. Conversely, a longer load arm requires more effort, reducing efficiency.

Question 10: Sketch a simple diagram of a lever used in a sports context (e.g., a bat, a golf club). Label the parts and briefly describe how it functions as a lever.

Answer: The sketch should depict a long handle (lever) with effort applied at one end, a fulcrum near the middle or at the base, and the load at the other end. The diagram should be labeled accordingly, illustrating how force is transferred to move or hit an object.