Quiz: Line of Gravity, Equilibrium, Levers & Pulleys There was an error trying to submit your form. Please try again. 7. How is a 'lever' defined in the lesson? * A type of joint capsule A muscle that contracts to produce force A rigid bar capable of movement around a fixed point (fulcrum) A flexible rope passing over a grooved wheel This field is required. 10. Why are most levers in the human body classified as third-class levers? * They only occur in the lower limb They eliminate the need for any effort They favor speed and range of motion even though mechanical advantage is less than 1 They give the greatest mechanical advantage for lifting heavy loads This field is required. 2. In the human body, the center of gravity lies approximately at which level? * S2 vertebral level (around the waist) T12 vertebral level C7 vertebral level L5 vertebral level This field is required. 9. Which movement is given as the human-body example of a first-class lever? * Standing on toes (heel raise) Elbow flexion while holding a dumbbell Kicking a ball Nodding of the head at the atlanto-occipital joint This field is required. 6. A plaster cast applied on a fractured ankle is an example of which type of fixation? * Passive fixation Unstable fixation Dynamic fixation Active fixation This field is required. 3. How is 'base of support' defined? * The height of the center of gravity above the ground The angle formed at a joint The area on which an object/body is supported The total body weight This field is required. 8. Which two forces are needed for 'work' to be done on a lever? * Effort and weight (load) Gravity and mass Fulcrum and load Friction and tension This field is required. 11. What is the formula for mechanical advantage (MA) of a lever? * MA = Effort arm + Weight arm MA = Weight arm ÷ Effort arm MA = Effort arm × Weight arm MA = Effort arm ÷ Weight arm This field is required. 5. Which of the following is NOT a condition for stable equilibrium? * Center of gravity as low as possible Line of gravity falling near the center of the base A large base of support Line of gravity falling outside the base of support This field is required. 1. What is the 'line of gravity' in the human body? * The distance between two joints The vertical line passing through the center of gravity The line connecting the two feet The horizontal line through the shoulders 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 A fixed pulley changes the direction of force; a movable pulley reduces the effort needed (roughly by half) Both reduce effort equally This field is required. 4. According to the lesson, equilibrium occurs when: * Gravity is removed from the body Forces acting on the body are perfectly balanced and it remains at rest The body moves at a constant high speed All forces on the body stop acting This field is required. Back Next Submit Quiz There was an error trying to submit your form. Please try again.
