Physics Tuition Singapore – Energy,Work and Power Misconceptions

Misconception 1

Kinetic energy is a vector quantity and its direction is the same as the direction of motion of the object.

Correct Concept

Kinetic energy is a scalar quantity and does not have direction. Its magnitude depends on mass and speed (which is equal to the magnitude of velocity).

Misconception 2

A car travels from the top of a hill down a slope. Neglecting frictional forces, the final kinetic energy of the car is equal to the loss of potential energy.

Correct Concept

A car travels from the top of a hill down a slope. Neglecting frictional forces, the increase in kinetic energy of the car is equal to the loss of potential energy. Therefore, the final kinetic energy = initial kinetic energy –  loss of potential energy 

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