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Summary of Liberal Arts Physics in senior high school (concept + formula) Because it is a liberal arts, so test concept more The relative calculation is less Just draw a conclusion according to the formula But my foundation is very weak I can't sum it up
1、 Motion of particle (1) --- linear motion
1) Uniform linear motion
1. Average velocity v = s / T (definition) 2. Useful inference vt2 - VO2 = 2As
3. Velocity at middle time VT / 2 = vplane = (VT + VO) / 2 4. Final velocity VT = VO + at
5. Middle position velocity vs / 2 = [(VO2 + vt2) / 2] 1 / 2 6. Displacement S = V flat t = VOT + at2 / 2 = VT / 2T
7. Acceleration a = (VT VO) / T, take VO as positive direction, a and VO in the same direction (acceleration) a > 0; opposite direction, af2)
2. Composition of mutual angular forces
When f = (F12 + F22 + 2f1f2cos α) 1 / 2 F1 ⊥ F2: F = (F12 + F22) 1 / 2
3. The range of resultant force is | F1-F2 | ≤ f ≤ | F1 + F2|
4. The orthogonal decomposition of the force FX = fcos β FY = fsin β β is the angle between the resultant force and the x-axis TG β = FY / FX
Note: (1) the composition and decomposition of force (vector) follow the parallelogram rule. (2) the relationship between resultant force and component force is equivalent substitution relationship, which can replace the joint action of component force with resultant force, and vice versa. (3) in addition to formula method, it can also be solved by drawing method, in which case, the scale should be selected to draw strictly. (4) when the values of F1 and F2 are fixed, the formula method can be used to solve the problem, The greater the angle between F 1 and F 2 (α angle), the smaller the resultant force. (5) the composition of forces on the same straight line can take the positive direction along the straight line, and the direction of force can be represented by sign, which is converted into algebraic operation
4、 Dynamics (motion and force)
1. The first law of motion (Law of inertia): an object has inertia and always maintains a state of uniform linear motion or static state until it is forced to change this state by an external force
2. The second law of motion: F = ma or a = f / Ma is determined by the external force, which is consistent with the direction of the external force
3. The third law of motion f = - F & acute; negative sign means opposite direction, F and F & acute; act on each other respectively
4. The balance of two forces f = 0. Overweight: n > G weightlessness: n
RELATED INFORMATIONS
- 1. The expression of Ohm's law in AC circuit is?
- 2. What is the mathematical expression of Ohm's law of the whole circuit?
- 3. The mathematical expression of Ohm's law is______ The units of the three physical quantities I, u and R in the formula are______ 、______ 、______ ．
- 4. What is full circuit? And mathematical expression of Ohm's law
- 5. How to understand Archimedes principle
- 6. The usage of five laws of Archimedes' principle on F floating When will f-float = g-row be used? F floating = ρ liquid GV discharge when to use? When is f float = f lower surface - f upper surface = f2-f1 row used? F-float = G-F when to use? When is f-float = g-row used? Help me make it clear If there are any other formulas, let's be clear~
- 7. Why does Archimedes principle f float = g row I understand the derivation process of the formula. Don't tell the story of the crown
- 8. Archimedes' principle can be expressed by the formula F floating = P liquid GV. What is v discharge liquid? Detailed point! A question a question answer!
- 9. On the physical problems of Archimedes principle There is a metal ball hanging at the lower end of the spring dynamometer. The indication of the spring dynamometer is 10N. If half of the metal ball is immersed in water, the indication of the spring dynamometer is 8N. If the metal ball is completely immersed in water, what is the indication of the spring dynamometer?
- 10. Archimedes principle problem g row = f float = m row g right, so m row and so on are not equal to the mass of the object put in? There is a question: put a 10 cm long solid cube gently into a beaker full of water (here I ask the first question, is it completely submerged?). When the wood block is still, 600 g of water will overflow from the beaker (the second question is as our teacher said: F floating = g row = m row, g = ρ liquid (here the liquid is water) GV row, then = 1 × 10 & # 179; kg / M & # 179; 8 N / kg × 1000 × 10 ^ - 6 is equal to 9.8 N, but it can be calculated with m row g = 0.6 kg × 9.8 N / kg = 5.88 n. who can tell me how this is all the same? The density of water is the same. The volume of water discharged is the same. The first one is 1.0 × 10 & # 179; × 1000 × 10 ^ - 6 = 1 kg. The second one is 600 g = 0.6 n. why is it different!)
- 11. In the experiment of using free falling body method to verify the law of conservation of mechanical energy, the formula for calculating the velocity of the nth point is
- 12. Law of conservation of physical and mechanical energy In the following motions, the mechanical energy conserved is () 1. An object moving at a constant speed on a smooth horizontal plane 2. An object moving in a circular motion at a uniform speed 3. An object that slides along a smooth slope 4. Throwing a moving object horizontally (please write down why it is right and why it is wrong)
- 13. What are the common formulas of the law of conservation of mechanical energy?
- 14. What is the reason for the small air resistance when a dense object falls (in the experiment to verify the law of conservation of mechanical energy)?
- 15. Please use Newton's law and kinematics related knowledge to obtain the law of conservation of mechanical energy through theoretical derivation
- 16. The condition of the law of conservation of mechanical energy A piece of wood slides down a smooth slope. Because only gravity does work, the mechanical energy of the piece is conserved If the inclined plane is not smooth and the block is subject to friction, and a force F is applied to the block in the opposite direction and equal to the friction force, then can the mechanical energy of the block be considered to be conserved?
- 17. What is the main content of the law of conservation of mechanical energy in senior one
- 18. What is the content of the law of conservation of mechanical energy
- 19. The content of the law of conservation of mechanical energy
- 20. Proof of quadratic term theorem The coefficients of X in (x + 1) (2x + 1) (3x + 1) (NX + 1) expansion