Then calculate the work done by these forces.Ī 10-N force is applied to push a block across a friction free surface for a displacement of 5.0 m to the right. For each case, indicate which force(s) are doing work upon the object. The following descriptions and their accompanying free-body diagrams show the forces acting upon an object. A free-body diagram is a diagram that depicts the type and the direction of all the forces acting upon an object. On many occasions, there is more than one force acting upon an object. Since F and d are in the same direction, the angle is 0 degrees.Ģ. The applied force must be 147 N since the 15-kg mass (F grav=147 N) is lifted at constant speed. The displacement is given in the problem statement. ![]() Thus, the angle between F and d is 30 degrees. It is shown that the force is 30 degrees above the horizontal. It is said that the displacement is rightward. The amount of work done upon an object depends upon the amount of force (F) causing the work, the displacement (d) experienced by the object during the work. The force and the displacement are given in theproblem statement. He applies a force of 30 N at an angle of to the horizontal for 6m. NEET 2019: A body of mass m is kept on a rough horizontal surface (coefficient of friction m) A horizontal force is applied on the body, but it does. A boy drags a 10 kg box across the friction-less surface. Therefore, the work done by gravity is 1332 J. Find the friction force act asked in Physics by PalakAgrawal ( 76. W = (100 N) * (5 m) * cos(30 degrees) = 433 J Mass m 10 kg, angle The work done by gravity formula is given by, W mgh cos. A particle of mass 5kg is moving on rough fixed inclined plane with constant velocity of 5m//s as shown in the figure. Since F and d are in the same direction,the angle is 0 degrees. It is said (or shown or implied) that the force and the displacement are both rightward. If a box with mass of 50 kg is moving on a rough surface with kinetic friction coefficient of 0.7, how much force is needed to keep the box moving Group of answer choices6. The force and the displacement are given in the problem statement. With finish machining, positive rake inserts are usually selected to get a better surface finish.W = (100 N) * (5 m)* cos(0 degrees) = 500 J The coefficient of kinetic friction on the hill is 0.40. The object is allowed to move and it stops on a rough horizontal surface, at a distance of 4.0 m from the bottom of the hill. negative rake inserts are best suited for rough machining since they can absorb cutting forces which allows higher cutting speeds. On a planet where g 10.0 m/s2 and air resistance is negligible, a sled is at rest on a rough inclined hill rising at 30 as shown in the figure. Different levels of roughness make different demands on the inserts and cutting angles. ![]() Finishing or fine machining can provide high dimensional accuracy and close tolerance while roughing can’t.Ħ. A block of mass M 9kg is moving with uniform velocity of 2ms on a rough horizontal surface under the action of constant force F The force acts at an angle 37circ to. ![]() The surface quality after finishing is better than that after roughing.ĥ. The material removal rate in roughing process is higher than finishing.Ĥ. Higher feed rate and cut depth are applied in roughing.ģ. Roughing is mainly to remove a large amount of excess material from the piece, finishing is to improve surface finish, tolerance, and reduce or minimize the errors.Ģ. What’s the specific difference between roughing and finishing?ġ. The roughing operation is used to produce a part geometry close to the shaped of finished product in a short time, and the finishing operation is performed after roughing to achieve the final geometry and other details. While the person is pushing the trolly he expends 25 joules of energy but the question does not provide enough information to determine where the energy goes. ![]() Conventional machining processes are suitable for high stock removal and good surface quality, which involves two stages or two kinds of processes. Answer (1 of 4): The question is confused/incomplete. To meet the basic requirement of CNC machining, a number of operations need to be performed in the machine shop, including turning, milling, facing, and more.
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