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It's more difficult to start moving a heavy carton from rest than it is to keep...

It's more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because

1. the normal force is greater when the carton is at rest

2. us<uk (Mu)

3. initially, the normal force is not perpendicular

4. uk<us (Mu)

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uk<us (Mu)

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