An object with a mass of #4 kg# is on a plane with an incline of #pi/12 #. If the object is being pushed up the plane with #9 N # of force, what is the net force on the object?
f the incline of plane is 15°(π/12), the component of his weight that is opposite to the force is: m g sin 15° = 4 kg x 9,81 m/s^2 X 0,26 =10,16 N
so the net force on the object in the direction of motion is 10,16-9 = 1,16 N toward the descent.
Of course there is also a component of weight against the inclined plane, balanced by the same