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A person throws an object on a horizontal frictionless plane surface. It is noticed that there are two forces acting on this object -(i) gravitational pull and (ii) normal reaction of the surface. According to the third law of motion, the net resultant force is zero. Which one of the following can be said for the motion of the object?

A person throws an object on a horizontal frictionless plane surface. It is noticed that there are two forces acting on this object -(i) gravitational pull and (ii) normal reaction of the surface. According to the third law of motion, the net resultant force is zero. Which one of the following can be said for the motion of the object? Correct Answer The object will move with constant velocity.

CONCEPT:

  • Newton’s Third Law states that for every action there is an equal and opposite reaction.
  • Newton’s first law states that an object that remains in uniform motion will remain in uniform motion unless it is acted upon by an external force.
  • Force: The interaction which after applying on a body changes or try to change the state of rest or state of motion is called force. 

Force (F) = Mass (m) × acceleration (a)

EXPLANATION:

  • If the net resultant force is zero, then the acceleration of the body will be zero, and the state of motion is not changed and hence the object will move with constant velocity. So option 4 is correct.

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