Question

A vehicle is moving with a uniform velocity on a smooth horizontal road, then power delivered by its engine must be(a) uniform(b) increasing(c) decreasing(d) zero

Answer 1

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(A) Uniform
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Answer 2

Answer:

The correct option is (d) Zero.

Explanation:

• The cause of this is friction.
• Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such as the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion. Automobile engines use about 20% of their output to overcome frictional forces in moving parts.
• The adhesion forces between the contact zones of the surfaces, which are always microscopically uneven, appear to be the primary cause of friction between metals. Shearing these "welded" joints and the action of the tougher surface's imperfections scrubbing against the softer surface cause friction.

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