A girl riding her bicycle up a steep hill decides to save energy by zigzagging rather than riding straight up. Ignoring friction, her strategy will:
a) Require the same amount of energy but less force on the pedals,
b) Require the same amount of energy and the same amount of force on the pedals,
c) Require less energy and less force on the pedals,
d) Require less energy and more force on the pedals.
Conservation Of Energy :
For the conservation of energy, the total energy contained within the system remains constant or the mechanical energy remain constant but its forms can be changed from one form into another, for example, the potential energy contained within the system is changed to kinetic energy when the object is allowed to fall from a certain height.
Answer and Explanation:
When the girl riding the bicycle climb up a steep hill then the potential energy is increasing regardless of the path taken by the bicycle but when the girl riding the in a zig-zag manner then the force exerted on the pedals is reduced which will take less effort to reach the top of the hill.
Thus, when the girl rides his bicycle in a zig-zag manner then the energy remains constant but the force on the pedals is reduced hence the correction option will be (a)
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from Geography 101: Human & Cultural GeographyChapter 13 / Lesson 9