Why is it easier to move boxes on a wheeled dolly than by sliding them?

• Correct Answer: rolling friction
• more total work
• starting friction
• increase surface tension

Explanation: Rolling friction is friction that acts on objects when they are rolling over a surface. Rolling friction is much weaker than sliding friction or static friction. This explains why it is much easier to move boxes on a wheeled dolly than by carrying or sliding them. It also explains why most forms of ground transportation use wheels, including cars, 4-wheelers, bicycles, roller skates, and skateboards. Ball bearings are another use of rolling friction (see Figure below ). They allow parts of a wheel or other machine to roll rather than slide over one another.

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