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The derivation process of physical Acceleration Formula in grade one of senior high school needs formula and derivation process urgently!
The acceleration formula?
What is the law of conservation of momentum? What is the formula?
The content of the law of conservation of momentum: if the system is not affected by external forces or the sum of external forces is zero, the total momentum of the system remains unchanged
Expression: P1 + P2 = P1 '+ P2' or: m1v1 + m2v2 = m1v1 '+ m2v2'
Explanation and formula of momentum conservation law
If a system is not subject to external force or the vector sum of the external force is zero, then the total momentum of the system remains unchanged. This conclusion is called the law of conservation of momentum. The law of conservation of momentum is one of the most important and universal conservation laws in nature. It is applicable to both macro objects and micro particles; it is applicable to both low-speed moving objects and high-speed moving objects, It is an experimental law and can also be derived from Newton's third law and momentum theorem
3. The mathematical expression of momentum conservation: (1) P = P ′, that is, the total momentum at the beginning of the interaction is equal to the total momentum at the end of the interaction (or at an intermediate state); (2) Δ P = 0, that is, the change of the total momentum of the system is zero, It can be expressed as: m1v1 + m2v2 = m1v1 ′ + m2v2 ′ (both sides of the equation are vector sum) (3) Δ P1 = - Δ P2. That is to say, if the system is composed of two objects, the momentum changes of the two objects are equal in magnitude and opposite in direction. Attention should be paid to the Vectoriality of momentum changes here, But its vector sum is invariable
RELATED INFORMATIONS
- 1. The physical formulas of the second half of the semester are the theorem of kinetic energy, the law of conservation of momentum and so on,
- 2. How to deduce the centripetal acceleration formula a = R ω ^ 2?
- 3. Changing the known formula P = M1 · V1 + M2 · V2 / M1 + M2 into the known formula of P, m, V1, V2, M2 (P ≠ V2)
- 4. In the following motion processes, in any equal time, the momentum change of the object is always equal () A. Uniform circular motion B. free falling motion C. horizontal throwing motion D. uniform deceleration linear motion
- 5. If two objects have the same momentum, they must have () A. the same velocity B. the same mass C. the same direction of motion If two objects have the same momentum, they must have () A. Same speed B. same mass C. Same direction of motion D. same acceleration
- 6. As shown in the figure, the length of the uniform thin straight bar AB is l, the mass is m, and the instantaneous velocity of point a is V, then the momentum of the bar AB is? What about kinetic energy?
- 7. The kinetic energy of electron is equal to the static energy. What's the wavelength?
- 8. Momentum: when m and V are constant, only the direction of V changes, then the momentum changes
- 9. The mass of the inclined trolley is m and the height is h. When an object with mass m slides down from the top of the trolley, the speed of the object sliding away from the bottom of the inclined trolley is set as V, regardless of all friction. The following statements are: ① the speed of the object sliding away from the trolley v = 2GH; ② the speed of the object sliding away from the trolley V < 2GH; ③ the speed of the object sliding away from the trolley v = MVM; ④ the speed of the object sliding away from the trolley V < MV M where the correct one is () A. Only (1) and (3) correct B. only (1) and (4) correct C. only (2) and (3) correct D. only (2) and (4) correct
- 10. 1. An object is thrown up 420 away from the ground and lands after 10 seconds, 2. The car with mass m moves forward on a smooth horizontal plane with speed V1. There is a man with mass m on it. He asks how fast the car is when the man jumps backward and horizontally from the speed V2 of the car, This involves the relative speed, I think people's speed should be (V1 - V2) But the answer is (v-v2). He sets V to make the speed of the car after jumping. I think the speed can't change suddenly. It should be v1. Why
- 11. Detailed derivation of Acceleration Formula by difference method in senior one physics
- 12. Does inelastic collision satisfy momentum conservation
- 13. Momentum and kinetic energy are conserved simultaneously, and the formula of velocity is obtained
- 14. What is the meaning of the maximum loss of mechanical energy in completely inelastic collision For example, when a small ball climbs onto a large wooden block that was originally stationary, the last two have the same speed, which is a completely inelastic collision 1 / 2mV ^ 2 --- 1 / 2 (M + m) V total ^ 2 = MGH can It is obvious that mechanical energy is conserved. Why is it called the greatest loss of mechanical energy? Is this in contradiction with the characteristics of completely non-linear
- 15. Why the mechanical energy loss is the biggest in completely inelastic collision? The biggest loss of mechanical energy should not be the two objects that move at first, but they all stop at last?
- 16. Expression of elastic potential energy
- 17. What is the formula of elastic potential energy?
- 18. A series of problems to solve.. eigenvalue equation, I do not understand, in self-study A (n + 1) - 5An + 6A (n-1) = 0 A1 = 1 A2 = 1 to find the general term formula of sequence
- 19. Why do we need to verify n = 1 when we use the undetermined coefficient method to find the general term formula
- 20. Given the recurrence formula F (n) = (n-1) (n-2) [f (n-2) + F (n-3) + (n-3) * f (n-4)] (n > 4), find the general term formula f(n)=(n-1)(n-2)[f(n-2)+f(n-3)+(n-3)*f(n-4)] (n>4) f(1)=f(2)=2 f(3)=2 f(4)=6 f(1)=f(2)=0 There's a wrong number on it This f (n) has a multiple relation with / E when n approaches infinity Give several f (n) to facilitate the test results f(5)=24 f(6)=160 f(7)=1140 f(8)=8988 The recursion above is equivalent to the recursion below f[n]=(n-1)(f[n-1]+(n-2)*f[n-3])