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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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