Physics · Force and Laws of Motion
Spring balance A is attached at one end to spring balance B, whose other end is fixed to a rigid support. A force is applied to the free end of spring balance A. Both balances show the same reading. What does this observation indicate?
- 1Only spring balance A exerts force on B.
- 2Both balances exert forces in the same direction.
- 3The force exerted by A on B is equal and opposite to the force exerted by B on A.✓
- 4The force exerted by A on B is greater than that by B on A.
Correct answer
The force exerted by A on B is equal and opposite to the force exerted by B on A.
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