Block 1 (10 kg) is pulled by a rope from left to right up a ramp which is inclined 50 degrees from the horizontal. The rope pulls on block 1 with a force of 180 N parallel to the surface of the inclined plane. The coefficient of kinetic friction between the block and the surface equals 0.7. (use g = 10 m/s2) On a sheet of paper, draw the free body diagram for block 1 using the two-subscript notation from class. Assume that the x-axis is parallel to the incline and positive in the direction up the incline. After completing the free body diagram, enter below each force and its x & y-components. FORCES on BLOCK 1 Normal force on block 1 by Surface N1S =  i +  j N Frictional force on block 1 by Surface f1S =  i +  j N What is the acceleration a of block 1? a =  i +  j m/s2

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”