What is the work done against friction

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3. Work done by overcoming friction is equal to the negative value of work done by friction
there are positive and negative work to do, positive work to do power, negative work to do resistance, it can also be said that the object overcomes this force to do (positive) work
hope you understand, hope to adopt!

4. μ We can use p = FV, μ If it changes, we can only use the kinetic energy theorem to find work, but also power

5. The work is: the proct of the force and the distance of the object in the direction of the force.
if the speed direction (pulling direction) of the object is the specified direction, the direction of the friction force is opposite, and the work done by the friction force is negative. That is to say, work should be done by overcoming the friction force

6. It is always the relative displacement in the direction of force multiplied by the force, which is relative displacement, not absolute displacement
by the way, friction does positive work on the conveyor belt.

7. The kinetic energy lost by inelastic collision between two bodies is transformed into the internal energy of the system, which is equal to the work done by overcoming friction ring collision
conservation of momentum
m1v1 + m2v2 = m1v1 & # 39+ m2v2'
by energy conservation
1 / 2mv1 ^ 2 + 1 / 2m2v2 ^ 2 = 1 / 2mv1 & # 39^ 2+1/2m2v2'^ 2+Q
Wf=Q=1/2mv1^2+1/2m2v2^2-1/2mv1'^ 2-1/2m2v2'^ two

8. It depends on what you want. There are actually two forces doing work to overcome friction. One is friction and the other is negative work; One is motivation, doing positive work. If the work required to be done by friction or the heat loss in the process of doing work is the former; If power is required to do the work of the latter; If it is required that the kinetic energy of the object after work is calculated as the difference between the two. Generally speaking, work done by overcoming friction refers to work done by friction. When the displacement is 0, the work done is not necessarily 0, because it is not said that the magnitude of the power is always the same ring the turning process. If it changes, the kinetic energy of the object may change when it returns, that is, the total work done is not zero.

9. W = FS is the formula of work, f is the magnitude of the force, s is the moving distance in the direction of the force
here to overcome gravity to do work, the force is gravity g, and the height is the moving distance h in the direction of the force, so w (overcome gravity) = GH
to overcome friction is w = f (friction) s, which is w = FS
I hope you understand!

10. Generally speaking, the change of potential energy = the change of kinetic energy + the lost energy. No matter in junior high school or senior high school, the whole state of spring is static, that is, the momentum is zero, and the work done by friction is the change of elastic potential energy
the teacher said it in class. If it helps you, give it a compliment.