Physics · Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications
is applied to unwind a screw.
is applied to unwind a screw.
- A. single force
- B. Couple
- C. Parallel force
- D. None of these
Step-by-step solution
Unwinding a screw requires a turning effect (torque). A couple consists of two equal and opposite forces with a perpendicular distance between them, producing pure rotation without translation, which is ideal for unscrewing. A single force would cause translation or require an off-center application, but the typical mechanism (like a screwdriver) applies a couple.
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