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Which of the following objects is not experiencing a net force directed north? (A) An object moving south at a decreasing speed. (B) An object moving north at an increasing speed. (C) An object instantaneously at rest that then begins to move north. (D) An object moving north at a constant speed.
The correct option is (D) an object moving north at a constant speed.In accordance with Newton’s Second Law of Motion, force (F) is equal to the rate of change of momentum (p)F = dp/dt …… (1)Momentum of an object (p) is equal to the mass of the particle (m) time’s velocity of the object (v).p = mv …… (2)Putting the value of equation (2) in equation (1), we get,F = dp/dt = d(mv)/dt= m dv/dt …… (3)If an object moves with a constant speed (v = constant), then the term dv/dt in equation (3) will be equal to zero.So, dv/dt = 0 …… (4)Putting the value of equation (4) in equation (3), force will be,F = m dv/dt = (m) (0) = 0 …… (5)Therefore an object moving north at a constant speed is not experiencing a net force directed north.From the above observation we conclude that, option (D) is correct.
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