How does kinetic energy theorem overcome friction

1. In fact, it's similar to the operation of buying okb. As long as you have BTC or usdt, it's enough, and then you can register in the currency trading area. It's very convenient.

2. 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!

3. The friction is multiplied by the distance in this direction. Only when the external force and the friction force are equal, can we use the force to overcome the friction force to calculate. From the energy point of view, friction is to convert kinetic energy into heat, and as long as friction has been doing work, it means that friction has been consuming energy. Just think about common sense.

4. If the friction force is a constant force, then use the constant force to do work: w = flcosa
if it is a variable force, then use the kinetic energy theorem or the law of conservation of energy to solve the problem.

5. No matter what force does work, it's a pattern w = FS. You first know the magnitude of the force depends on the direction of the force and the distance of the force acting in this direction? It depends on the direction of the force and the direction of the movement. This is the first step of the analysis

6. If f does negative work, it should be - FS = final kinetic energy - initial kinetic energy. If you move the minus sign over, it will be FS = initial kinetic energy - Final kinetic energy

7. Yes, because all the work done by the friction is converted into the kinetic energy of the block, so it is OK. At this time, the friction of the block is not greater than the maximum friction. However, if the block moves relative to the board, the heat converted by the work done by the friction should also be considered. Please accept if you are satisfied

8. The work done by friction does not have a negative sign, which is positive work, so the work done to overcome friction is negative work.

9. When using the kinetic energy theorem, the external power amplifier is placed to the left of the equal sign, and the kinetic energy is placed to the right of the equal sign< When the potential energy decreases, the gravitational work is positive, otherwise it is negative; If the direction of friction is opposite to that of the object, its work is negative, otherwise it is positive

* Don't mix the work of gravity and friction together. We should say it separately, otherwise it will cause confusion.