Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100

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JanaALEVEL
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Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object (a) is brought to rest rapidly. (b)decelerates gradually to rest. (c) continues at the velocity it had before the second force was applied. (d)is brought to rest and then accelerates in the direction of the second force.


How do I know whether it's a or c ?
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uberteknik
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(Original post by JanaALEVEL)
Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object (a) is brought to rest rapidly. (b)decelerates gradually to rest. (c) continues at the velocity it had before the second force was applied. (d)is brought to rest and then accelerates in the direction of the second force.


How do I know whether it's a or c ?
The question stated 'so that the forces cancel'. i.e. The net force acting on the object is zero. Newton's first law, an object will continue it's steady-state motion in a straight line or state of rest unless acted on by an external force.

The correct answer is c). The first force accelerates the object, the second force cancels the accelerating force so the object continues it's straight line motion at the velocity achieved at the instant the second force is applied.
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JanaALEVEL
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(Original post by uberteknik)
The question stated 'so that the forces cancel'. i.e. The net force acting on the object is zero. Newton's first law, an object will continue it's steady-state motion in a straight line or state of rest unless acted on by an external force.

The correct answer is c). The first force accelerates the object, the second force cancels the accelerating force so the object continues it's straight line motion at the velocity achieved at the instant the second force is applied.
Got it but how would I stop the object then ?
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uberteknik
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(Original post by JanaALEVEL)
Got it but how would I stop the object then ?
Remove the first accelerating force and let the second opposite force slow the object. Then when it's velocity is zero, remove the second force at that instant.
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