Two blocks of weights W1= W2= 5 kN rest on a rough inclined plane and are connected by a short piece of string as shown. If the coefficient of friction are μ1 = 0.20 and μ2 = 0.30 respectively. a. Which of the following gives the following gives the inclination of the plane for which sliding will impend. b. Which of the following gives the value of the force acting on the string. c. Which of the following gives the friction force on the lower block.

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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!