in finding work done by object moving upward on the inclinced plane then why we not minus friction force from the force applied

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Q. A block of mass 2 kg kept at rest on an inclined plane of inclination 37° is pulled up the plane by applying a constant force of 20 N parallel to the incline. The force acts for one second. (a) Show that the work done by the applied force does not exceed 40 J. (b) Find the work done by the force of gravity in that one second if the work done by the applied force is 40 J. (c) Find the kinetic energy of the block at the instant the force ceases to act. Take g = 10 m/s².

Q. A rigid body of mass 0.3 kg is taken slowly up an inclined plane of length 10 m and height 5 m (assuming the applied force to be parallel to the inclined plane), and then allowed to slide down to the bottom again. The coefficient of friction between the body and the plane is 0.15. using g = 9.8

m / s^{2}

find the
(a) work done y the gravitational force over the round trip
(b) work done by the applied force over the upward journey
(c) work done by frictional force over the round trip
(d) kinetic energy of the body at the end of the trip?

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:

(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.

(b) work done by gravitational force in the above case,

(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity,

(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

Q. A rigid body of mass 3.0 kg is taken slowly up an inclined plane of length 10 m and height 5 m, and then allowed to slide down to the bottom again. The coefficient of friction between body and the plane is 0.15. Using g = 9.8

m / s^{2}

. find the
(a) work done by the gravitational force over the round trip
(b) work done by the applied force (assuming it to be parallel to the inclined plane) over the upward journey.

Hulk applied a very large amount of force on the wall, but the wall does not move. In this case, we can say that the work done by the force applied by hulk is 0.

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