Just follow the instruction.
You may try this with your siblings. You only need 1 meter string, a thread or nylon cord.
1. Ask for volunteers.
2. One learner would hold a nylon cord at length across two hands.
3. The second learner loops his nylon cord onto the other learner's cord.
4. The second learner pulls slowly on the cord, if the loop is closer to the other learner's hand, how would you feel the pull on each hand, and why? Hint: Stronger force, in this case the tension, must be represented by longer vector.
I would feel stronger pull as the second learner pulls stronger because a nylon cord is inextensible and transfer the tension equal to the force my friend applies.
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