Unless otherwise stated, all objects are located near the Earth\'s surface, wher

Question

Unless otherwise stated, all objects are located near the Earth's surface, where g = 9.80 m/s2.
An object (mass 3.1kg ) slides upward on a vertical wallat constant velocity when a force F of 60N acts on it at an angle of 60? to the horizontal.

Part A: Draw a Free body diagram Draw your vectors starting from the black dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded. The options on this are Normal Force, Pulling Force, Kinetic Friction, and Force of Gravity.

Part B: Using Newton's laws find the normal force on the object.

Part C: Determine the force of kinetic friction on the object.

Explanation / Answer

The normal force is F*cos60,
the friction force is ?F*cos60
it acts downwards if the object moves upwards.

the gravitational force is Fg = mg (downwards)
the vertical force component is
= F*sin60

There is no net force, so
Fsin60 = mg + ?Fcos60
Fsin60 - mg = ?Fcos60
? = (Fsin60 - mg)/(Fcos60)
? = (60sin60 - 3.1*9.81)/(60*cos60)
? = 0.75

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