Homework Help: physics

Posted by monic on Friday, October 12, 2012 at 12:10am.

A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal.
(a) Determine the work done by the applied force.
J

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

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

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

physics - Henry, Saturday, October 13, 2012 at 8:28pm
Forces that are not applied in the direction of movement does no work.
The movement is horizontal.

a. Work = F*d = 12*cos25 * 2.8 = 30.5 J.
12*cos25 = Hor. component of applied force.

b. No work done.

c. No work done.

d. Same as a.

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