نماذج أسئلة وأجوبة
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According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
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The friction experienced by a body, when in motion, is known as
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rolling friction |
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dynamic friction |
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limiting friction |
| D. |
static friction |
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The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
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آخر تحديث
9/14/2015 2:10:08 PM
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