Worksheet: Work done and net-work done by some common forces 1. A block is pulled at constant speed along a horizontal s

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Worksheet Work Done And Net Work Done By Some Common Forces 1 A Block Is Pulled At Constant Speed Along A Horizontal S 1 (37.44 KiB) Viewed 62 times

Worksheet: Work done and net-work done by some common forces 1. A block is pulled at constant speed along a horizontal surface through a distance, x. Assume mass of the block is m, the inclination of the string attached to the block is a. a) (5 points) Draw free body diagram of the block showing all forces acting on it. Denote the pull force by T, the tension on the string. Choose one axis along the direction of motion. There will be one force acting neither along the x or y axis. Also write the components of the force. b) (5 points) Starting from the generic formula for work done by a force, W=Fd cost, write the work done by T. Please, draw Fd diagram on the side as shown in class. Remember you draw it every time you use the work done by a force formula. c) (5 points) Starting from the generic formula for work done by a force, W=Fd cost, find the work done by horizontal components of the T. Again, don't forget the Fd diagram. d) (5 points) Starting from the generic formula for work done by a force, W = Fd cost, find the work done by vertical components of the T. Again, don't forget the Fd diagram. e) (5 points) Add the work done by components of T computed in part c and part d above with the work done by T. Are they same or not? Please explain why the result makes sense.
f) (5 points) Starting from the generic formula for work done by a force, W=Fd cost, find the work done by normal force. Again, don't forget the Fd diagram. g) (5 points) Starting from the generic formula for work done by a force, W = Fd cost, find the work done by mg or weight force. Again, don't forget the Fd diagram. h) (5 points) Using the free body diagram in part a, use equilibrium condition along the horizontal direction to compute the friction force. i) (5 points) Use the friction force computed in part g to compute the work done by the friction force. Again, don't forget to start from the general formula of work done and to draw Fd diagram. j) (5 points) Notice from the free body diagram of part a, there are four main forces acting on the block, namely T, n, mg and fk. You computed the work done by these forces individually above. Copy the work done results from above here first. Now use them to find Network done. Does the result make sense? Explain