A block of mass m = 2.5 kg is pushed a distance d =2.2 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle θ = 25.0° below the horizontal as shown in the figure. If the coefficient of kinetic friction is μ k = 0.2. Determine the work done on the block by: (a) the applied force, (b) the normal force, (c) gravity force, (d) kinetic friction force and (e) Determine the net work done on the block
The answer is zero because the normal force acts perpendicular to the direction of motion, mathematically: