When a 100-N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of tension are exerted in the strand? How about if the bag is supported by four vertical strands?
please explain what this question is asking, and what the answer is and why. i really want to try and understand physics. thanks =)When a 100-N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of ...?
There are two forces acting on the bag of nails (i) the force of gravity (weight) downward and the tension of the string, upward.
As the bag is motionless, these two forces must be equal and opposite.
So the tension exerted on the strand by which the bag is hanging is equal and opposite to its weight. It is 100 N upward.
If it is supported by four vertical stands, its weight is acting downward which is balanced by the normal reaction of the four vertical stands.
Assuming each vertical stand share the load equally, the normal reaction exerted by each of the vertical stands is 25 N upward.
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