As shown in the figure, on a rough horizontal plane, there are two pieces of wood 1 and 2 with mass M1 and M2 respectively. In the middle, they are connected by a light spring with original length L and stiffness coefficient K. the sliding friction coefficient between the block and the ground is μ. Now, a horizontal force is used to pull the block 2 to the right. When the two blocks move at a constant speed, the distance between the two blocks is () A. L+μkm1gB. L+μk(m1+m2)gC. L+μkm2gD. L+μk(m1m2m1+m2)g
Study on block 1. Block 1 is subjected to gravity, spring pull, ground support force and friction force. According to the balance condition, the spring force F = μ m1g & nbsp; & nbsp; and the spring elongation length x = FK = μ m1gk is obtained by Hooke's law. Therefore, the distance between two blocks is s = L + x = L + μ km1g when two blocks move at a uniform speed together. Therefore, select a
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- 1. A and B are placed on a smooth horizontal plane and connected by light spring A and B are placed on a smooth horizontal plane and connected by a light spring. Now, the opposite horizontal forces F1 and F2 are applied to a and B respectively, and F1 = 20n and F2 = 10N Spring force If there is only F1, what is the spring force?
- 2. There is an object with mass m = 1kg hanging on the spring. Under the following conditions, what is the indication of the spring scale? (g = 10m / S ^ 2) (1) The velocity is 5 m / s (2) At the acceleration of a = 5m / S ^ 2, the vertical acceleration rises (3) The acceleration of a = 5 m / S ^ 2 is used to accelerate the descent (4) The acceleration of gravity g is used to decelerate and rise vertically
- 3. If the elevator stops suddenly, the observer on the ground will see that the ball is in the process of continuing to rise () A. The velocity decreases gradually. B. the velocity increases first and then decreases. C. the acceleration increases gradually. D. the acceleration decreases first and then increases
- 4. As shown in the figure, the mass of object a close to the vertical side is Ma = 0.2kg, and the mass of object B on the horizontal plane is MB = 1kg, As shown in the figure, the mass of the object a on the vertical side is Ma = 0.2kg, and the mass of the object B on the horizontal plane is MB = 1kg. The weight of the rope and the friction between the rope and the pulley are not included. The OB part of the rope is horizontal, and the OA part is vertical. A and B just move at a constant speed together. Take g = 10m / S2, 1) Find the dynamic friction between object B and desktop 2) If horizontal force F is used to pull B to the left, how much tension does it take to make objects a and B move at a uniform speed Don't let me in
- 5. As shown in the figure, two objects a and B with mass m are connected by a light spring with stiffness coefficient K. A is lifted in the air by hand with external force F, and B is h above the ground. After letting go, a and B fall, and B does not rebound after colliding with the ground. When the spring force is mg, what is the falling distance of object a?
- 6. As shown in the figure, a and B balls are attached to the lower end of the vertical suspension light spring, and their mass ma = 0.1kg and MB = 0.5kg. When the spring is at rest, its elongation is 15cm. If the thin line between a and B is cut, what is the amplitude and maximum acceleration of a ball in simple harmonic motion?
- 7. The length of springs a and B is 1 m and 0.5 m, and the stiffness coefficients are 100 N / M and 150 n / m respectively. When they are connected in series and fixed on two columns with a distance of 2 m, the length of springs a and B is 100 N / M and 150 n / m respectively Find the length of a
- 8. The original length of the spring with stiffness coefficient K is lo. One end of the spring is tied to the vertical axis, and the other end is tied to a small ball with mass m to make uniform circular motion on a smooth horizontal plane When the spring elongation is l, what is the angular velocity of the metal ball rotating around the vertical axis?
- 9. A light spring is used to connect three objects a, B and C of M1, M2 and M3. How big is f when the stiffness coefficients of AB, K1 and BC are just separated from the ground? (1) How big is f when C is just separated from the ground? (2) how high does a rise at this time?
- 10. As shown in the figure, a small ball with gravity g is placed vertically on a smooth ring with radius R. the stiffness coefficient is K and the natural length is l (L)
- 11. A small ball fell from the air onto a spring placed vertically on the ground and asked what would happen to the state of the ball How does the acceleration change? How does the speed change? When is the maximum speed? When is the maximum acceleration It starts with the contact spring
- 12. The ball with mass m = 1kg passes through the inclined rod, which forms an angle of θ = 30 ° with the horizontal direction, If the ball is pushed by a horizontal force of F = 20n, it can accelerate the ball to slide up the bar 1. The sliding friction coefficient between the ball and the inclined rod 2. The acceleration of the ball sliding upward along the rod
- 13. Two sliders A and B with mass M1 and M2 are horizontally connected by a light spring and placed on the horizontal table top My answer is C. I think there is a problem My problem stem is the problem in the screenshot, I just don't want to type it out again
- 14. As shown in the figure, there is a light spring on the horizontal table, the left end is fixed at point a, and the right end is located at point B when the spring is in the natural state. The height of the table is h. The object P with mass m compresses the spring slowly to point C to release it. After passing point B, the object P moves in a straight line with uniform deceleration, flies off the table from point D on the right edge, and falls to point n on the horizontal ground The distance between the two points is also s, the dynamic friction coefficient between the object P and the table is μ, the acceleration of gravity is g, the object P can be regarded as a particle, and the spring is within the elastic limit, regardless of the air resistance (1) If the mass of 5 m block Q (also can be regarded as a mass) slowly compresses the spring to point C, and the released block Q just stops at point B, suppose that the two blocks are made of the same material and have the same surface roughness, calculate the distance L between two points B and C
- 15. As shown in the figure, there is a light spring on the horizontal table, the left end is fixed at point a, and the right end is at point B in the natural state. There is a vertical spring on the right side of the horizontal table
- 16. The friction coefficient between the object and the table is u. The displacement s caused by pushing the object with force F is to remove F, How far can an object go
- 17. A uniform thin rod with length L and mass m is placed flat on a horizontal table with friction coefficient M. suppose that the rod rotates around the center o with angular velocity W at the beginning and perpendicular to the axis of the table. Try to find (1) the friction torque used on the rod. (2) how long does it take for the rod to stop rotating
- 18. The mass of AB is 2kg, the dynamic friction coefficient of 4kga and the table top is 0.02. When object B is released gently, the acceleration of object a sliding along the table top is?
- 19. A and B objects are stacked on the horizontal table, as shown in the figure. The friction coefficient between B and the table is 0.4, and the mass of the two objects is Ma = 2kg and MB = 3kg respectively. When B is pulled by 30n horizontal force F, AB does not produce relative sliding, so the friction force on a is calculated
- 20. It is known that the dynamic friction coefficient between the block and the table is 0.2, and the maximum static friction between the block and the table is 5 N. Two horizontal forces f '= 10N and f' '= 6N are applied on the block (1) Find the size and direction of the friction force on the block (2) If the external force F 'is removed, what is the magnitude and direction of the friction force on the block?