Question
Change in gravitational potential energy = (d) Complete the sentences. (2) Choose answers from the box. chemical elastic potential gravitational potential kinetic Friction between the brakes and the cable causes the speed of the lift to decrease. As the speed decreases, there is a decrease in the energy of the lift. As the speed decreases, there is an increase in the energy of the
Answer
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Martin
Professional · Tutor for 6 years
Answer
A. Kinetic B. Potential
Explanation
This question is focusing on energy transformation in systems on motion in terms of relative motion involving gravitational potential energy and conversely kinetic energy. From the informations in the box, the speed of a lift decreases due to the interaction between the brakes and cable which infers a decrease in theoretical kinetic energy attributed to speed. It implies that energy is transformed from kinetic energy to other more stable energy, that of potential in this case; hence, there feels a "increase" in potential energy.