Science Worksheets for Grade 6: How Does a Lubricant Work?

FRICTION FREE
Problem: How does a lubricant work?

Materials:

• A smooth metal tray
• notebook
• a small flat glass
• Bottle
• water
• soap

Procedure:
1. Hold up the tray on the books to make a slope?
2. Wet one side of thr tray and slide the bottle down each side in turn.
3. Now rub the soap on the wet side and slide the bottle down again. Observe the movement
              of the bottle.

Guide Questions:
1. Is there friction between the bottle and the dry metal tray? Why do you say so?
2. Why did the glass bottle slide down easily when the surface of the tray was wet with water?
3. What happened when you rubbed the soap on the wet side of the tray?
4. Is soap a lubricant? Why or why not?

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Credits: Arcelle Yuan