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A mass m is attached to a string and is whirled in a horizontal circle. If the r

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Question: A mass m is attached to a string and is whirled in a horizontal circle. If the radius of the circle is halved, what happens to the tension in the string if the speed remains constant?

Options:

  1. It doubles
  2. It remains the same
  3. It halves
  4. It quadruples

Correct Answer: It doubles

Solution: 

Tension T = mv²/r. If r is halved, T doubles for constant speed.

A mass m is attached to a string and is whirled in a horizontal circle. If the r

Practice Questions

Q1
A mass m is attached to a string and is whirled in a horizontal circle. If the radius of the circle is halved, what happens to the tension in the string if the speed remains constant?
  1. It doubles
  2. It remains the same
  3. It halves
  4. It quadruples

Questions & Step-by-Step Solutions

A mass m is attached to a string and is whirled in a horizontal circle. If the radius of the circle is halved, what happens to the tension in the string if the speed remains constant?
Correct Answer: Tension doubles
  • Step 1: Understand the formula for tension in the string, which is T = mv²/r.
  • Step 2: Identify the variables in the formula: T is tension, m is mass, v is speed, and r is the radius of the circle.
  • Step 3: Note that the problem states the speed (v) remains constant.
  • Step 4: Recognize that if the radius (r) is halved, we replace r with r/2 in the formula.
  • Step 5: Substitute r/2 into the formula: T = mv²/(r/2).
  • Step 6: Simplify the equation: T = mv² * (2/r) = 2(mv²/r).
  • Step 7: Conclude that the new tension (T) is double the original tension when the radius is halved and speed is constant.
  • Centripetal Force – The tension in the string provides the centripetal force required to keep the mass moving in a circular path.
  • Relationship between Tension and Radius – The formula T = mv²/r shows that tension is inversely proportional to the radius when speed is constant.
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