A block of mass 2.50 kg is pushed 2.20m along a frictionless horizontal table by

Question

A block of mass 2.50 kg is pushed 2.20m along a frictionless horizontal table by a constant 18.0 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

Force F = 18 N

Distance S = 2.2 m

Angle = 25 degrees

a) the work done by the applied force W = F cos 25 * S

                                                                = 35.88 J
1

(b) the work done by the normal force exerted by the table W‘ = 0

Since normal force and displacement are perpendicular to eachother
2

(c) the work done by the force of gravity W “ = -mg sin25 * S = -22.77 J
3

(d) the work done by the net force on the block = W + W‘ + W “ = 13.1 J

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