Grade 9 Integrated Science Revision & Practice

The forces preview asks what happens when a book slides. Name the force, describe its direction relative to motion, and link it to the observed change. Keep practical examples safe: a light object on a clear tabletop is enough to discuss the idea.

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Explain friction and changes in motion

Describe the starting motion.
Identify friction as opposing relative motion.
Explain why the object slows, without claiming that all forces always stop objects.