(a) What is the minimum magnitude of the force F , parallel to the plane, that w

Question

(a) What is the minimum magnitude of the forceF, parallel to the plane, that will prevent thesled from slipping down the plane?
1 N

(b) What is the minimum magnitude F that will start thesled moving up the plane?
2 N

(c) What value of F is required to move the block up theplane at constant velocity?
3 N

Explanation / Answer

a) As you can see, P*sin20>P*cos20*0,27 so there is no need any force to prevent it from slipping down. b) The force F must equal to the static friction force andone component of the weight F=P*cos20*0,27+P*sin20=35,7(N). c) The force now must equal to the kinetic frcition force plus theweight component. F=P*cos20*0,13+Psin20=27,85(N)

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