Two blocks (15 Kg and 25 Kg) are shown on a fixed 40 degree incline connected by a rope. An applied force acts on the 15 Kg block with a direction parallel to the incline as shown. There is no friction. Fapplied 15 kg 25 Kg 40

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Q: calculate the friction force if the block is at rest

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!