An object with a mass of 10kg. Its gravity is about_ N. The direction of gravity is

10x9.8 = 98n, vertical downward

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1. 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）
2. 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)?
3. 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)
4. 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,
5. 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
6. 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?
7. When a moving object contacts a stationary object with a spring, why is the spring compression maximum when two objects have the same speed
8. 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?
9. 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
10. 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
11. What is the gravity of an object with a mass of 10kg______ N. The direction of gravity is always the same______ Yes
12. The mass of a is 5kg, the mass of B is 10kg, and the gravity of B is calculated
13. 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
14. 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
15. 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)
16. On the smooth horizontal plane, a car B with mass m = 2kg is at rest, and there is a linear track with length L = 1m on the upper surface of the car At present, a small block a with mass m = 1kg slides onto the left end of car B at speed v = 5m / s, and the dynamic friction coefficient between block a and the horizontal track of car B is 0.3? The main question is (2) the formula MV = mvm-mv1 ① 1 / 2mV ^ 2 = 1 / 2mvm ^ 2-1 / 2mV ^ 2-umgl ② these two formulas are listed by me, but in the answer, the formula ② is 1 / 2mV ^ 2-umgl = 1 / 2mvm ^ 2 + 1 / 2mV ^ 2, why? What's wrong with my formula?
17. On the smooth horizontal plane, there is a flat car with a length of 10m and a mass of M = 1kg. There is a small block with a mass of M = 1kg at the left end of the car. The small block is given an initial speed. After a period of time, the block does not fall from the car, and the total speed is 5m / s. The initial speed and dynamic friction factor are calculated
18. The dynamic friction coefficient between the vehicle and the road surface is u, and the radius of a road corner is R (assuming that the maximum static friction is equal to the sliding friction, g = 10 / M / s ∧ 2, q) 1 / assuming that the road surface is level, in order to ensure that the car does not slip when turning, how much speed can the car not exceed If the road surface at the turning point of the highway is designed to be high on the outside and low on the inside, so that the road surface and the horizontal plane form an angle of X, at what speed can the car turn, so that there is no friction between the car and the road surface in the radial direction
19. Is the static friction force between the car and the ground equal to the weight of the car itself?
20. Is the friction of the car moving on the horizontal plane sliding friction or static friction?