Physics · Foundation

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Static frictionRunning
Friction sled. Normal force at 38 N. Available friction 13.3 N, Required friction 28 N. Currently available friction is short by 14.7 N.TUNINGLOADNORMAL FORCEAVAILABLE FRICTIONREQUIRED FRICTION38 N
t = 0.0s

Available friction

13.3N

Required friction

28N

38 N

Friction sled. Normal force at 38 N. Available friction 13.3 N, Required friction 28 N. Currently available friction is short by 14.7 N.

What has to balanceFf=μsNF_f = \mu_s N

What is happening

You arrive at a loading ramp where crates keep sliding on wet steel.

The crate is sliding. Not enough weight is pressing it down — the grip coefficient is 0.35 and it needs 28 N of friction to stay put.