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. What is the frictional force acting on the block (mu0. A force of 20 N is acting on the block in the opposite direction of velocity. For each case, indicate which force(s) are doing work upon the object. Answer (1 of 2): A block of mass 10 kg is moving on a rough surface with a velociy of 4 m/s. 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. Work done by the gravitational force on a body of mass m moving on a smooth horizontal surface through a distance s is: (Given acceleration due to gravity g). Identify the following as a scalar or vector: the mass of an object, the number of leaves.
Find work done by the force, increase in kinetic energy and the power exerted by the force. The applied force must be 147 N since the 15-kg mass (F grav=147 N) is lifted at constant speed. A body of mass 10 kg is moving on a horizontal smooth surface at a velocity of 20m/s, a constant force of 40N is applied on the body for 20 seconds in the direction of the velocity. The displacement is given in the problem statement. W = (147 N) * (5 m) * cos(0 degrees) = 735 J Calculate the work done by a 2.0-N force (directed at a 30 angle to the vertical) to move a 500 gram box a horizontal distance of 400 cm across a rough floor at a constant speed of 0.5 m/s. Thus, the angle between F and d is 30 degrees. It is shown that the force is 30 degrees above the horizontal. 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. It is said that the displacement is rightward. The force and the displacement are given in theproblem statement. Since F and d are in the same direction,the angle is 0 degrees. Compute: (a) the work done by the applied force in 10 sec., (b) the work done by the friction force in 10 sec., (c) the work done by the net force on the body in 10 sec. It is said (or shown or implied) that the force and the displacement are both rightward. A body of mass 2 kg initially at rest moves under the action of an applied horizontal forces of 7N on a table with co-efficient of kinetic friction 0.1. 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 negative rake inserts are best suited for rough machining since they can absorb cutting forces which allows higher cutting speeds. Different levels of roughness make different demands on the inserts and cutting angles. A block of massm sliding on the surface of a rough sphere of radius r, at the instant it is located at angle with respect to the vertical. Finishing or fine machining can provide high dimensional accuracy and close tolerance while roughing can’t.Ħ. Sliding on the Surface of a Rough Sphere Carl E. 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. Find the work done by tension in the string if radius of hemisphere is. 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. is pulling a mass m from ground on a fixed rough hemispherical surface upto. 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. Conventional machining processes are suitable for high stock removal and good surface quality, which involves two stages or two kinds of processes. 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.