Homework Help: Physics

Posted by KC on Monday, April 6, 2009 at 4:10pm.

Calculate the work done by the applied force accelerating a 2 kg object at 3 m/s/s over 4 m if there is a 2.5 frictional force of resistance. I calculated using F=ma=6N; then net force = 6N-2.5N=3.5 N so W=fd=14J. Did I do this correctly? Thanks

Physics - bobpursley, Monday, April 6, 2009 at 4:34pm
work done=2.5*3 + 2*3*4 I get more than you. You did the accelerating force only, you have to add the force working against friction
Physics - KC, Monday, April 6, 2009 at 4:52pm
Help!I'm really lost on this one.
Physics - bobpursley, Monday, April 6, 2009 at 6:52pm
correction: I mistyped the distance on friction.

Workdone=2.5*4+2*3*4 joules.

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