Tension In Strings
Mediumphysics
Two masses 3 kg and 5 kg connected by a light inextensible string are pulled on a frictionless surface by a 32 N force applied on the 5 kg mass. Find the tension (N).
Select the correct option:
Solution
Incorrect! Answer:
12 N
- System Analysis: Both masses move with the same acceleration (a).
- Calculate Acceleration:
- a=m1+m2F=3+532=832=4 m/s2.
- Free Body Diagram of 3 kg block: The only horizontal force on the 3 kg block is the tension (T) in the string.
- Equation: T=m1a.
- Substitution:
- T=3 kg×4 m/s2=12 N.
- Final Result: The tension is 12 N.
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About This Question
- Subject
- physics
- Chapter
- laws of motion
- Topic
- tension in strings
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
12 N
- System Analysis: Both masses move with the same acceleration (a).
- Calculate Acceleration:
- a=m1+m2F=3+532=832=4 m/s2.
- Free Body Diagram of 3 kg block: The only horizontal force on the 3 kg block is the tension (T) in the string.
- Equation: T=m1a.
- Substitution:
- T=3 kg×4 m/s2=12 N.
- Final Result: The tension is 12 N.
This medium difficulty physics question is from the chapter laws of motion, covering the topic of tension in strings. It appeared in the 2025 exam.
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