UPSC Prelims 2004·GS1·science-and-technology·science and technology

A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is:

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  1. ADriving force in the direction of car’s motion
  2. BResistance force opposite to the direction of car’s motion
  3. CAn inclined force
  4. DEqual to zeroCorrect

Explanation

The correct answer is D because of Newtons First Law of Motion. According to this law, an object will continue to move at a constant velocity unless acted upon by a net external force. Since the car is moving at a uniform speed of 60 km/hr in a straight line, its acceleration is zero. According to the formula Force equals Mass times Acceleration, if acceleration is zero, the net resultant force must also be zero. In this state, the driving force provided by the engine is exactly balanced by the opposing resistance forces like friction and air drag. Therefore, all forces acting on the car cancel each other out, resulting in a net force of zero.
science-and-technology: A car is running on a road at a uniform speed of 60 km/hr. The net resultant force on the car is
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