When a ball is thrown upwards, all of its kinetic energy is completely converted into gravitational potential energy with no energy transferred to the surroundings., TRUE, FALSE, A machine that produces 150 J of useful energy from 500 J input has an efficiency of 30%., TRUE, FALSE, Energy is described as “dissipated” because it is destroyed and no longer exists., TRUE, FALSE, Renewable energy sources are always completely reliable and available at all times., TRUE, FALSE, If two devices transfer the same amount of energy, the one that does it in less time has greater power., TRUE, FALSE, In a system with 200 J input energy and 140 J wasted, the useful energy output is 60 J., TRUE, FALSE, The gravitational potential energy gained by an object depends only on its mass and not on its height., TRUE, FALSE, Improving aerodynamics in vehicles can reduce energy loss due to air resistance., TRUE, FALSE, Energy pathways describe where energy is stored in a system., TRUE, FALSE, A perpetual motion machine is possible if friction and air resistance are completely eliminated., TRUE, FALSE.

UNIT 8

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