Six crates at rest on level surfaces. The crates have different masses and the frictional coefficients given as [mu_s,mu_k] between the crates and the surfaces differ. The same external force is applied to each crate, but none of the crates move.
1. 600 kg [0.8,0.5]
2. 750 kg [0.6,0.5]
3. 1500 kg [0.3,0.1]
4. 750 kg [0.4,0.3]
5. 500 kg [0.6,0.3]
6. 250 kg [0.2,0.1]
1. 600 kg [0.8,0.5]
2. 750 kg [0.6,0.5]
3. 1500 kg [0.3,0.1]
4. 750 kg [0.4,0.3]
5. 500 kg [0.6,0.3]
6. 250 kg [0.2,0.1]
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They are all the same and equal to the external force. That way Fnet = zero and a=0 so they don't move.
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The force cannot exceed 490 N (Case 6)
250*g*.2 = 490 N, the smallest value of all the static friction cases.......
250*g*.2 = 490 N, the smallest value of all the static friction cases.......