Quiz: Line of Gravity, Equilibrium, Levers & Pulleys There was an error trying to submit your form. Please try again. 3. How is 'base of support' defined? * The angle formed at a joint The height of the center of gravity above the ground The total body weight The area on which an object/body is supported This field is required. 1. What is the 'line of gravity' in the human body? * The line connecting the two feet The vertical line passing through the center of gravity The horizontal line through the shoulders The distance between two joints This field is required. 10. Why are most levers in the human body classified as third-class levers? * They give the greatest mechanical advantage for lifting heavy loads They eliminate the need for any effort They only occur in the lower limb They favor speed and range of motion even though mechanical advantage is less than 1 This field is required. 11. What is the formula for mechanical advantage (MA) of a lever? * MA = Effort arm × Weight arm MA = Effort arm + Weight arm MA = Weight arm ÷ Effort arm MA = Effort arm ÷ Weight arm This field is required. 9. Which movement is given as the human-body example of a first-class lever? * Elbow flexion while holding a dumbbell Standing on toes (heel raise) Kicking a ball Nodding of the head at the atlanto-occipital joint This field is required. 4. According to the lesson, equilibrium occurs when: * Gravity is removed from the body All forces on the body stop acting Forces acting on the body are perfectly balanced and it remains at rest The body moves at a constant high speed This field is required. 6. A plaster cast applied on a fractured ankle is an example of which type of fixation? * Dynamic fixation Unstable fixation Passive fixation Active fixation This field is required. 8. Which two forces are needed for 'work' to be done on a lever? * Friction and tension Fulcrum and load Gravity and mass Effort and weight (load) This field is required. 12. What is the main difference between a fixed pulley and a movable pulley? * A fixed pulley reduces effort; a movable pulley only changes direction Both change direction and neither reduces effort Both reduce effort equally A fixed pulley changes the direction of force; a movable pulley reduces the effort needed (roughly by half) This field is required. 2. In the human body, the center of gravity lies approximately at which level? * S2 vertebral level (around the waist) L5 vertebral level T12 vertebral level C7 vertebral level This field is required. 5. Which of the following is NOT a condition for stable equilibrium? * A large base of support Line of gravity falling outside the base of support Line of gravity falling near the center of the base Center of gravity as low as possible This field is required. 7. How is a 'lever' defined in the lesson? * A flexible rope passing over a grooved wheel A muscle that contracts to produce force A rigid bar capable of movement around a fixed point (fulcrum) A type of joint capsule This field is required. Back Next Submit Quiz There was an error trying to submit your form. Please try again.
