2010中考物理复习宝典(力、力和运动)(国外英文资料).docVIP

2010中考物理复习宝典(力、力和运动)(国外英文资料) A cavity blood treasure Qin, sprinkling can still go pictorial. The book together from time to time, one thing and song poetry. Once Lianjiu bird, fish think therefore abyss. Like attracts like., Birds of a feather flock together. This is the same root, fratricidal. This paper contributed by char1234. Doc document may at the WAP end of the browsing experience poor. Suggest you select TXT, or download the source file to the machine view. 2010 senior high school entrance examination physical review canon (force, force and motion) fifth gravity force A review of the 1. main navigation concept and formula (1) gravity and other forces, and also the effect of size and direction. The size of objects and the object of gravity is proportional to the mass, direction relation G=mg. gravity vertical downward, and the object where the water is perpendicular to the plane of heavy force in the role. The center of mass. (2) the friction force of sliding friction: is the relative sliding force of two bodies in contact. It is the role of the relative sliding block of the object, the size of f= N available to calculate. In general, 1. static friction: two contact with each other on the stationary phase and if the object has squeezed between the relative motion trend, will produce static friction force, with the size of the change, but the change has a certain scope. The 2. basic physical methods (1) comparison method Analysis of relationship between gravity and quality by this method. (2) induction method: through the analysis of specific gravity, friction force, summed up to produce force must have at least two objects, is the object role of objects. (3): the control variable method in exploring the factors affecting the friction the size of the force, the size and the contact surface pressure of the sliding friction force size and roughness related with this method, and has nothing to do with the contact surface area. 3. easily mixed problem (1) gravity