How to do work against friction in high school

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2. 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. Unknown_Error

6. < 1> The work done by friction is that the object is subject to friction (which can be a component force) and has displacement (displacement and friction are not perpendicular). When the angle is less than 90 degrees, the friction force does positive work. At this time, the friction force is the driving force, and the conveyor belt is the static friction force doing positive work. When the angle is greater than 90 degrees, the friction does negative work. At this time, the friction is resistance, and the object does work against the friction. It is said in the book that friction does negative work. For an object, it means that the object overcomes friction and does positive work& lt; 2> Work done by overcoming friction means that the above friction does negative work. For an object, it is the object that overcomes friction to do positive work. But this may only be understood in a certain way, because work done accurately may be done by force (although it is usually said that the object does work on the object), and friction actually does negative work. I'm not entirely clear about this. It may be that it transmits energy to the object exerting the force of friction, but it may also have internal energy. However, the energy of the object is transmitted, which may be to do positive work on the matter that increases the energy.

7. Find the common initial time of friction force

8. If it is a system, it is generally necessary to use the integral method to analyze the force on the whole system, and then calculate the work done by the friction. If the system overcomes the friction, the work is generally the opposite of the work done by the friction