Physics problem with block attached to rope?
Question
A 1kg block is at rest on the floor while a rope is pulling on it applying a force of 5N at an angle of 30 degrees above the horizontal.
What is the magnitude and direction of the normal force acting on the block?
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General Physics
7 years
1 Answer
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Answer ( 1 )
vertical forces acting on block are:
normal reaction, R acting up
component of applied force, 5sin(30) acting up
weight of block acting down, 1g
Therefore
R + 5sin(30) = g
R = g – 5sin(30)
= 9.8 – 5(1/2)
= 9.8 – 2.5
= 7.3 N acting upward