1) Which statement best defines mechanical work?Match up the following a) The force applied by a muscle regardless of movement b) The transfer of energy when a force causes displacement c) Any activity that uses calories d) A measure of how long a task takes 2) If a sprinter pushes the blocks with 400 N of force for 0.5 m, how much work is done? a) 200 J b) 800 J c) 200 N d) 20 W 3) A weightlifter holds a 100 kg barbell still for 5 s. What is the mechanical work done during this hold? a) 9810 J b) 500 J c) 0 J d) 1962 J 4) Power is best described as: a) Force × Acceleration b) Force ÷ Distance c) Work ÷ Time d) Energy ÷ Mass 5) Which combination produces the greatest power output? a) Large force applied slowly b) Small force applied quickly c) Large force applied quickly d) Small force applied slowly 6) In sport, which example relies most on maximal power? a) Marathon running b) Weightlifting clean & jerk c) Golf putting d) Yoga hold 7) Kinetic energy depends on: a) Mass only b) Velocity only c) Both mass and velocity d) Force and time 8) Which variable increases kinetic energy the most? a) Doubling the mass b) Doubling the velocity c) Halving the height d) Halving the gravity 9) When a ball is dropped and bounces, it never returns to the same height because: a) Potential energy increases each bounce b) Kinetic energy disappears completely c) Some energy is lost as heat and sound d) Gravity decreases with time 10) Which equation correctly links work, power and time? a) Power = Force × Displacement b) Work = Power ÷ Time c) Work = Force × Time d) Power = Work ÷ Time

Work, Energy, Power

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