posted
i'm not thinking too clearly right now cuz im not seeing the answer to this question, if someone knows how to do it you'll be my hero for life.
"you slide a .50 kg cart from rest across the floor with a push that takes .70 seconds to get up to a 4.0 m/s speed. The net force is 2.86 Newtons. What is the frictional force on the cart during the slide?
-i'm pretty sure the formula I have to use is Force= push-friction but i dont know the push force for some reason. any physics people in the room?
Posts: 20 | Registered: Apr 2003
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posted
i used f=ma to find the force that i gave in the problem (2.86) now i want to use that to find the frictional force...
Posts: 20 | Registered: Apr 2003
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posted
I don't believe there's enough information.
Rephrasing the problem, I can take a box on any surface, and by simply applying more force for the surfaces with the higher frictional coefficient achieve exactly that acceleration. We can know the net force based on that, but the frictional force will always be proportional to both the normal force (which we know) and the coefficient of kinetic friction (which we don't).
Posts: 15770 | Registered: Dec 2001
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posted
You can split it up, but that leaves two unknowns: F(friction) and F(exerted). The only one we know is F(total, aka net).
Posts: 15770 | Registered: Dec 2001
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