Incredibly complicated for basic physics

[JAK3CAL]

Homework Statement

You place a book flat on a table and press down on it with your right hand. The hand-to-book and table-to-book coefficients of kinetic friction are 0.47 and 0.44 respectively. The book's mass is 0.84 kg and your downward push on it is 9.00 N. Now, you use your left hand to push the book along the table at constant speed. Assuming that your right hand is stationary with respect to the table, what is the horizontal force exerted on the book by your left hand?

Homework Equations

The Attempt at a Solution

think its got something to do with the fact that the two friction coefficients are like a sandwich on the book. the x direction equation is the force you push the book with minus the two frictions added together= mass times acceleration but I can't get it to work. HELPPPPPPPPPPPPPPP I've spent an hour on this any push in the right direction is appreciated before I lose my damn mind

 

[collinsmark]

the x direction equation is the force you push the book with minus the two frictions added together= mass times acceleration

Yes, that much is correct. But don't forget the problem statement says, "use your left hand to push the book along the table at constant speed." What is the acceleration of something moving at a constant velocity?

You've mentioned that you've worked on this for an hour. So show us your work! Maybe we can help you once we see what you've done specifically, and where you are stuck.

 

[thehacker3]

https://www.physicsforums.com/showthread.php?p=2896168#post2896168

you wouldn't happen to both be in the same class, would you?

 

[JAK3CAL]

https://www.physicsforums.com/showthread.php?p=2896168#post2896168

you wouldn't happen to both be in the same class, would you?

probably haha...solved it though hopefully whoever that is was able to figure it out thanks for the help!

 

[fizzynoob]

You must remember that kinetic friction has a dependence of the Normal Force (N). So if you sum the forces in the x direction you get :

Fx = Fh - Fk= ma; (Fh = Force by hand; Fx = force of friction) what is acceleration if it is constant?Kinetic Friction is =$$\mu$$k*NYou can now plug in your frictional force, and solve for the force due to your hand