Wheels Flashcards

1
Q

Why does a wagon need wheels?

A

Friction opposes a wheel-less wagon’s motion

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2
Q

Why is sliding a box hardest at the beginning

A

Static friction is stronger than kinetic (sliding) friction, static friction’s maximum exceeds kinetic friction.

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3
Q

Static friction

A

opposes the start of sliding, it varies in amount from zero to a maximum value

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4
Q

Kinetic (sliding) friction

A

opposes ongoing sliding, it has a static constant value proportional to support force

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5
Q

What happens to energy as a box skids to rest?

A

That energy becomes thermal energy, only sliding friction wastes energy

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6
Q

Kinetic energy

A

energy of motion

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7
Q

Potential energy

A

stored in forces between objects

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8
Q

Thermal energy

A

disorder into tiny fragments, reassembling thermal energy is statistically impossible

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9
Q

How do wheels help a wagon coast?

A

Wheels can eliminate sliding friction, rollers eliminate sliding friction but don’t recycle, simple wheels have sliding friction at their hub/axle, combining roller bearings with wheels is ideal

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10
Q

What energy does a wheel have?

A

Kinetic energy, both translation and rational

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