Concept explainers
The sketch shows a conical pendulum. The bob swings in a circular path. The tension T and weight W are shown by vectors. Draw a parallelogram with these vectors and show that their resultant lies in the plane of the circle (recall the parallelogram rule in Chapter 5). What name do we use for this resultant force?
To draw: The sketch of a parallelogram with the vectors T and W along with their resultant.
To find: The name for the resultant force.
Answer to Problem 47A
The sketch is shown in Figure 1.
The resultant force is the centripetal force lies in the plane of circle.
Explanation of Solution
Introduction:
The centripetal force of the object is defined as,
  
Here,
Calculation:
Consider the tension T and weight W are the two adjacent sides of the parallelogram for the bob swings in a circular path.
Draw the sides of a parallelogram by draw a parallel to the force vectors tension T and weight W.
Sketch the parallelogram of forces as shown below.
  
Figure 1
The resultant force of the tension T and weight W is
The resultant force
Hence, the resultant force is the centripetal force lies in the plane of circle.
Conclusion:
Thus, the resultant force is the centripetal force lies in the plane of circle.
Chapter 10 Solutions
Conceptual Physics: The High School Physics Program
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