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A carrom striker keeps sliding after the finger leaves it. Something slows it down.

This track covers Chapter 5, Exploring Forces.

What this track covers

• A push or a pull. Every force is one of these.
• What a force does. It starts motion, changes speed, turns or reshapes.
• Touching, or not. Contact and non-contact forces.
• Two at once. Forces add or cancel.
• Balanced. The forces cancel.
• Unbalanced. The leftover changes the motion.
• Friction. A surface pushes back.
• Friction both ways. It helps and it hurts.
• Weight and the spring balance. The Earth's pull, read in newtons.
• Mass and weight. Mass stays the same. Weight changes with the place.
• The push a liquid gives. Upthrust, sinking and floating.

Quick catch-up

• Class 6: Like poles push apart. Unlike poles pull together.
• Class 7: speed is distance divided by time.

Safety

Every bench here is a simulation. Do real activities only with your teacher. Never throw or drop things near people.