A compressed spring is placed between the car and the wall. When the thin wire is burned by fire, we can see the phenomenon that

After the thin wire is disconnected, the kinetic energy of the car increases under the action of the spring, which indicates that the compressed spring stores energy, and the stored energy is converted into the kinetic energy of the car in the process of spring extension

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1. A spring is fixed at the top of the smooth slope, and the object slides to the right and rushes to the slope fixed on the ground. Suppose that the speed of the object at the lowest point a of the slope is V, and the spring is compressed Spring When it comes to point C, the spring is the shortest, and the height from point C to the ground is h, then how much work does the spring force do in the process from a to C? The answer is - 1 / 2mV ^ 2 = - MGH + W, but I want to use - 1 / 2mV ^ 2 = - mgh-w bullet. In the question, w bullet does negative work, so it's listed. If I move the term to find w, I will get a different formula from the answer (just opposite to each other). Where's my question?
2. When a moving object contacts a stationary object with a spring, why is the spring compression maximum when two objects have the same speed
3. If two objects M1 and M2 connected by light springs are placed on a smooth plane, the masses are not equal. If force F pushes M1, will the springs be compressed? M1 = = = = M2 use constant force F to push M1 to the left. Because the plane is smooth, M2 is not subject to friction and can't give the spring a left force, so the spring can't be compressed. At this time, they can be regarded as a whole. Is it true that the spring won't be compressed? If one side of a spring is fixed on the wall, the other end of the push will be compressed, Because the wall gives it a force. And the above problem is smooth, is it not compressed?
4. There are two cars a and B on the smooth horizontal plane There are two cars a and B on the smooth horizontal plane, and there is a light spring in the middle. Hold the car by hand and compress the spring to make the car in a static state. Take the two cars and the spring as a system. The following statement is correct: there are two cars a and B on the smooth horizontal plane, and there is a light spring in the middle, Hold the car by hand and compress the spring to make the car in a static state. Consider the two cars and the spring as a system? A after releasing the two hands, the total momentum of the system is moderate to zero B put the left hand first and then the right hand. Momentum is not conserved C put left hand first, then right hand, total momentum left D no matter when the two hands are released, the total momentum of the system will remain unchanged in the process of the spring returning to its original length, but the total momentum of the system may not be zero
5. P114 high school physics: 2 same objects on a smooth plane, a light spring is compressed in the middle, and the two hands are pressed to keep it still at the beginning A release both hands at the same time, the total momentum of the system is always 0 B put the left hand first, then the right hand, the total momentum is not balanced C put left hand first, then right hand, total momentum left D whenever the spring is released, the total momentum of the system remains unchanged, but not necessarily zero, as long as the spring is released and the original length is restored Which is right or wrong and why wrong
6. The displacement time relation of a car motion is x = 8t-2t & # 178;, then the following statement is correct (multiple choice) A. The car decelerates evenly B. The initial speed of the car is 8 m / s C. The acceleration of the car is - 2m / s and 178; D. The car stopped in two seconds
7. In the "urban and rural cleaning project", an environmental sanitation team rents a number of vehicles with a carrying capacity of 8 tons to transport a batch of construction waste. If each vehicle only contains 4 tons, then 20 tons of construction waste is left; if each vehicle is full of 8 tons, then the last vehicle is not empty. How many vehicles does the environmental sanitation team rent?
8. As shown in the figure, the mass ratio of a and B is Ma: MB = 3:2. They were originally stationary on the flat car C. There is a compressed spring between a and B. the dynamic friction coefficient between a and B and the upper surface of the flat car is the same, and the ground is smooth. When the spring is suddenly released, there is () A. A, B, C system momentum conservation B. A, B system momentum conservation C. car remains stationary D. car moves to the right
9. When an apple is thrown up, it is subjected to gravity and air resistance The resultant force of apple in the process of rising -- the resultant force of apple in the process of falling
10. Draw a graph of the gravity of the object below. G = 10 N / kg (1) a small ball with a mass of 8 kg when it falls freely in the air (excluding air resistance)
11. When an object with a mass of 10kg is placed on the horizontal ground, the dynamic friction coefficient between the object and the ground is 0.2 50N, the direction is 37 ° to the horizontal, and the object is pulled upward obliquely for 10m Calculate: the kinetic energy of the object when it moves to 10m position. (g takes 10m / S2; sin 37 ° = 0.6; Cos 37 ° = 0.8) Answer: 260 J To find the process,
12. An object originally standing on the horizontal ground, with a mass of 10kg From a certain moment, the object is subjected to a constant force of 20n along the horizontal direction. The dynamic friction coefficient between the object and the horizontal ground is known to be 0.10. Calculate the acceleration of the object and the velocity at the end of 5.0s during the motion. (G is taken as 10m / S2)
13. The mass of object a is 10kg, and the dynamic friction function between object a and the ground is μ = 0.2 The mass of object a is 10kg. When it is placed on the horizontal ground, the dynamic friction function between object a and the ground is μ = 0.2. If it is pulled by a force with an angle of 30 ° to the horizontal, how large is F needed to produce an acceleration of 1m / S2 (G = 10m / S2)?
14. The object with mass m of 10kg, on the horizontal ground, under the action of horizontal pulling force F 1 of 20n, moves along the horizontal ground with uniform speed and straight line An object with a mass of 10kg, m, is placed on the horizontal ground. Under the action of the horizontal pulling force F1 of 20n, the object moves in a straight line at a constant speed along the horizontal ground. If the object still moves in a straight line at a constant speed by using the pulling force F2 which is inclined upward at an angle of 37 degrees to the horizontal direction, the size of F2 is______ The dynamic friction coefficient between the object and the horizontal ground is_____ .（cos37°=0.8）
15. An object with a mass of 10kg. Its gravity is about_ N. The direction of gravity is
16. What is the gravity of an object with a mass of 10kg______ N. The direction of gravity is always the same______ Yes
17. The mass of a is 5kg, the mass of B is 10kg, and the gravity of B is calculated
18. The mass is m = 10kg, and the flatbed truck is long enough. On the smooth horizontal plane, a small car is placed at the left end, M = 1kg, and u = 0.2 When the speed of the trolley to the ground is 10m / s, calculate the speed of the trolley
19. When a car with mass m and length a moves from one end of the flatbed car with mass m and length B to the other end, what are the displacements of the car and flatbed car
20. As shown in the figure, there is a flat car with length x = 1m and mass m = 10kg, which is still on a smooth horizontal plane. A small block with mass m = 4kg is placed at one end of the car. The dynamic friction coefficient between the block and the car is μ = 0.25. To make the block move to the other end of the car in 2S, what is the horizontal force F acting on the block? (g = 10m / S2)