This 50 kg mass is sitting on a ramp with an angle of 35° to the horizontal. A p

Question

This 50 kg mass is sitting on a ramp with an angle of 35° to the horizontal. A person is also pushing horizontally, with a force of F, shown This 50 kg mass is sitting on a ramp with an angle of 35 degrees to the horizontal. A person (not in the picture) is also pushing horizontally, with a force F, shown. 343 In the absence of friction, what horizontal force is necessary to hold the mass stationary? Suppose there is friction (static coefficient 0.19, and kinetic coefficient -0.15). With this friction, what force (iIf any) is necessary to hold the mass stationary? (If no force is necessary, enter "O".)

Explanation / Answer

When there is friction, frictional force act in direction of Fcos35.

To hold the mass stationary,

mgsin35 - 0.19mg = F cos 35

(50*9.8( 0.574- 0.19) ) / 0.82 = F

F= 229.5 N

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