The Luke edition of compulsory two, Chapter 1, "Work and Power" ppt (1) It must be clear which work is the work of power. When solving the problem, you must pay attention to the work of the work to be done, or the work of the combined force. In the formula, s represents the displacement of the object acting on the force, and α represents the angle between the direction of the force and the direction of displacement. (2) Work is scalar, but there are positive and negative points, according to W = Fscos α: ①When α = 90 °, that is, the force is perpendicular to the displacement direction, then W = 0, the force does not do work on the object. ②When α> 90 °, then W <0, the force does negative work on the object, and the force acts as resistance. ③When α <90 °, then W> 0, the force does positive work on the object, and the force acts as motive force. Note: If the force does negative work on the object, it can be said that the object overcomes the force and does the work.
We many many classic and newly designed sofas which are upholstered with soft fabric and soft leather. We use very good foam which can make people feel comfortable when they seat on it.
Our sofas can be used for office, home, also some public places.Our sofas are not only suitable for your livingroom,but also suitable for hotel,villas,clubs. Welcome all the consumers from all over the world to buy the sofas from us ,you can put it for own use, also can resell it to make some profit.
Wood Sofa,Stainless Steel Sofa,Fabric Sofa,Leather Sofa
Shenzhen Yadea furniture Co. Ltd. , https://www.modernluxuryfurniture.com