Physics Question based on energy & work?
A block of mass m = 3.30 kg is pushed a distance d = 2.30 m along a frictionless horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle θ = 26.0° below the horizontal.
(a) Determine the work done on the block by the applied force.
_______ J
(b) Determine the work done on the block by the normal force exerted by the table.
________ J
(c) Determine the work done on the block by the force of gravity.
________ J
(d) Determine the work done by the net force on the block.
_______ J
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Verified answer
(a) Determine the work done on the block by the applied force.
16 * 2.3= 36.8 J
(b) Determine the work done on the block by the normal force exerted by the table.
39.3539 * 2.3= 90.514 J [ N = m g + F sin 26 = 3.3 * 9.8 + 16 * 0.4384 = 39.359 N ]
(c) Determine the work done on the block by the force of gravity.
32.34 * 2.3 = 74.38 J [ F = m g = 3.3 * 9.8 = 32.34 N ]
(d) Determine the work done by the net force on the block.
14.38 * 2.3 = 33.075 J [ Fnet = F * cos 26 = 16 * 0.89879 = 14.3807 N ]
Acceleration = Fnet / m = 14.3807 / 3.3 = 4.3577893 m/s2
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