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Project
Organise a discussion in your class on the topic: Friction — a necessity or a problem? Make a note of the discussion and state where friction is a necessity and when it is a problem.
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Key Points
Friction is both helpful and harmful, depending on the situation.
Key Points / Good Practices
- Friction as a necessity: it lets us walk, grip objects, write, and brake a vehicle.
- Friction as a problem: it wears out machine parts, wastes energy as heat, and slows motion.
- Let one group argue "necessity" and another argue "problem".
- Note examples each side gives and write a short summary of the discussion.
- Conclude that friction is needed in many places but unwanted in others.
Friction helps us grip and stop, but also wastes energy and wears parts.
