Practice IB Sports, exercise and health science (SEHS) Topic B.1.4 Levers in Movement and Sport with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for B.1.4 Levers in Movement and Sport and mirrors Paper 1A, 1B, 2 style where relevant.
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What is the functional trade-off of the third-class lever system shown in this biceps curl?
What is the main mechanical advantage of the lever system shown in the image?
During neck extension/flexion in a football (soccer) header, which lever class does the atlanto-occipital (neck) joint represent?
Within a second-class lever system, such as the human ankle during a standing heel raise, which component is positioned between the axis of rotation and the application of muscular force?
Third-class levers (e.g., the quadriceps acting at the knee during a leg extension) have what primary mechanical trade-off?
It provides a mechanical advantage, reducing the muscular force required
It allows greater range and speed of motion at the cost of force efficiency
It minimizes joint strain by placing the load directly over the fulcrum
It maximizes the torque created by the weight with minimal muscular effort
Increased range of motion and speed
Decreased effort force required to lift the load
Increased joint mobility at the ankle
Increased resistance to muscle fatigue
First-class
Second-class
Third-class
Fourth-class
The Effort
The Resistance
The Pivot
The Load
It requires more force to be exerted than the weight of the load, but increases the speed and range of motion.
It provides a mechanical advantage, allowing the muscle to move a heavy load with a small amount of effort.
It positions the fulcrum between the effort and the load to ensure a balance between force and stability.
The effort arm is significantly longer than the resistance arm, reducing the energy cost of the movement.
