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Work done on the block by force 
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#1
Jul2309, 06:17 AM

P: 6

1. The problem statement, all variables and given/known data
A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B? 2. Relevant equations W= PCos (theta)D 3. The attempt at a solution I have no idea what to do for this! 


#2
Jul2309, 06:33 AM

P: 767

I suppose Work done on the block = change in kinetic energy + work against friction



#3
Jul2309, 07:00 AM

Sci Advisor
HW Helper
Thanks
P: 26,157

Hi Zmuffinz! Welcome to PF!
(have a theta: θ ) 


#4
Jul2509, 06:19 AM

P: 6

Work done on the block by force
well you see thats why im stuck, i wasnt given an angle, or mass of the block or anything so ive got no clue as to what to do:(



#5
Jul2509, 06:20 AM

P: 6




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