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Grade 12th passMechanics

Two similar wooden blocks are tied one behind the other and pulled across a level surface. Friction is not negligible. The force required to pull them at constant speed is F .If one block is stacked upon the other then the new force required to pull them at constant speed will be approximately

Profile image of Urooj
7 Years agoGrade 12th pass
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1 Answer

Profile image of Arun
7 Years ago
233-1420_22.PNGWhen the blocks stack upon each other, the force of friction experienced by the block is:233-2316_21.PNGThe kinetic force of friction is also given as:233-1246_20.PNG – T = 0,k in equation F – ƒkSubstitute T = ƒk = 0T = ƒkThe net force on block 2 is written as:T – ƒ233-669_19.PNG is the force of kinetic friction between block and the surface, and T is the tension in the string.The free body diagram of block 2 is:k – T = 0Here, ƒkThe blocks move with constant speed, therefore the net force acting on the blocks must be zero. to account for same, substitute the net force on each block with zero as:F – ƒ233-2293_18.PNGhe free body diagram for block 1 (tied to block 2 via string) is.

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