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Q. |
Which one of the following is not the law of dry friction? |
A. | If friction is neglected, the reactions are always normal to the surfaces on contact |
B. | Friction always acts to oppose the relative motion of the free body |
C. | If static friction is acting, the value of the friction force may vary from zero to its maximum value |
D. | The force of friction is always normal to the surface |
E. | All of the above |
Answer» D. The force of friction is always normal to the surface |
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