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Does the scale read 100 N, 200 N or zero?

In the image, the setup shows two weights, each of 100 N, hanging from either side of a spring scale, which is positioned horizontally. The question asks whether the scale will read 100 N, 200 N, or zero.

**Solution**:

- Each 100 N weight exerts a force of 100 N downward.
- These two forces pull on the spring scale from opposite sides.

The key here is to understand that the spring scale measures the **tension** in the string. Tension is the force transmitted through the string when it's pulled tight by forces acting from opposite ends. In this case:

- The 100 N weight on the left pulls the scale to the left with 100 N.
- The 100 N weight on the right pulls the scale to the right with 100 N.

Since these forces are equal and opposite, the **tension** in the spring scale will be the force exerted by one side, **100 N**. The scale does not add the forces together because it's measuring the force exerted on it by one side of the system.

Thus, the scale reads **100 N**.

Let me know if you'd like further details or have any questions!

Here are some follow-up questions you might consider:
1. What would the scale read if the weights were different, say 100 N on one side and 200 N on the other?
2. How would the reading change if one side was attached to a wall instead of a second weight?
3. What is the principle of action and reaction, and how does it apply to this scenario?
4. How does tension in a rope or string behave in different mechanical systems?
5. What would happen to the reading if the string on one side was cut?

**Tip**: In tension problems involving spring scales or ropes, the key is to focus on the forces acting on one side of the scale or the rope—not the sum of all forces.

This problem explores the forces acting on a spring scale with two equal weights (100 N) on either side. It covers key concepts like tension, force equilibrium, and Newton's Third Law of Motion. Suitable for students in Grades 8-10.

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