hockey45 Posted May 30, 2007 Share Posted May 30, 2007 hi guys, i am having trouble with this problem. Calculate the average force of friction acting on a wood block as it is propelled along the floor by an elastic band ? my solution and my ideas: What does it mean by average froce of friction? I first weighed the peice of wood to find its mass. i then used a newton scale and pulled the elastic band 60 cm and found the force of friction which was 8n. is this force applied(8n)?did i measure the force correctly of the elastic.?i have no idea where to go from here. is there any kinetic energy involved? do i use Ek=1/2 mv^2. any suggestions would be helpful. do i time the wodeen block after i let it go and find the velocity. i am sure it is uniform acceleration. thank you. Link to comment Share on other sites More sharing options...
Klaynos Posted May 30, 2007 Share Posted May 30, 2007 I don't think you will need to use Energy at all. What you will need to do is remember that: Fnet=ma And you know the mass and and you should be able to work out what Fnet is in terms of friction and applied forces. Link to comment Share on other sites More sharing options...
hockey45 Posted June 11, 2007 Author Share Posted June 11, 2007 please delete sorry Link to comment Share on other sites More sharing options...
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