A maintenance team needs to move a heavy steel generator across a flat concrete floor. Arrange the following methods in order from the HIGHEST amount of frictional resistance to the LOWEST amount of frictional resistance.
- 1Dragging the generator directly across the dry concrete floor.
- 2Sliding the generator across the floor after applying a thick layer of industrial lubricant.
- 3Placing the generator on cylindrical steel rollers before moving it.
Answer
The correct order from highest to lowest resistance is: dragging directly on dry concrete, sliding with industrial lubricant, and placing on steel rollers.
Dry sliding friction creates the most resistance due to direct, rough surface-to-surface contact. Lubricating the surface reduces this resistance by creating a fluid film between the objects, lowering the friction coefficient. However, rolling friction (using rollers) is the most efficient method and creates the absolute least resistance, as it prevents the surfaces from scraping against each other entirely.
Step-by-Step Solution
Key Concept
Types and relative magnitudes of mechanical friction
Estimated Time:45s