A block of mass 2.50 kg is pushed 2.80m along a frictionless horizontal table by

Question

A block of mass 2.50 kg is pushed 2.80m along a frictionless horizontal table by a constant 14.0 N force directed 25.0° below thehorizontal. (a) Determine the work done by the appliedforce.
1 J

(b) Determine the work done by the normal force exerted by thetable.
2 J

(c) Determine the work done by the force of gravity.
3 J

(d) Determine the work done by the net force on the block.
4 J (a) Determine the work done by the appliedforce.
1 J

(b) Determine the work done by the normal force exerted by thetable.
2 J

(c) Determine the work done by the force of gravity.
3 J

(d) Determine the work done by the net force on the block.
4 J

Explanation / Answer

Mass m = 2.5 kg Distance moved S = 2.8 m Applied force F = 14 N Angle = 25 o (a). the work done by the applied force W = F cos * S                                                                  = 35.52 J (b). the work done by the normal force exerted by the table W' = 0 J Since normal force and displacement are perpendicular to eachother (c). the work done by the force of gravity W " = m g *S                                                                      =  68.6 J (d). Net work = W + W ' + W " substitue values we get answer

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