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Question
In which of the following examples, there is zero net force acting on the object ?
I. A car drives around a circular path at a constant speed.
II. A person pushes on a door to hold it shut.
III. A ball, rolling across a field, slowly comes to a stop.
I. A car drives around a circular path at a constant speed.
II. A person pushes on a door to hold it shut.
III. A ball, rolling across a field, slowly comes to a stop.
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Solution
The correct option is B II only
(I) When car drives around a circular path , there is always a centripetal force toward center provided by frictional force .So we have only one force, net force is not zero.(II) When a person pushes the door , door also exert an equal and opposite force on man , net force is zero.(III) A ball stops after some time due to frictional force ,only one force acting there ,so net force is not zero.
(I) When car drives around a circular path , there is always a centripetal force toward center provided by frictional force .So we have only one force, net force is not zero.
(II) When a person pushes the door , door also exert an equal and opposite force on man , net force is zero.
(III) A ball stops after some time due to frictional force ,only one force acting there ,so net force is not zero.
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