The friction coefficient between AB, B and the ground is 0.25, and the horizontal force of F = 12.5n is used After a period of time, pull out B from under a, g = 10m / S ^ 2. Find out the work done by F and the acceleration of a and B in the process of pulling out the board
The friction between the wood block and the board can provide a maximum acceleration of 2.5 meters per second. If it does not slide, the acceleration provided by the tension to the whole system is 3.75 meters per second
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- 1. As shown in the figure, the mass of flat car B is m = 4kg, and the mass of object a on the car is m = 1kg. The dynamic friction coefficient between them is μ = 0.4, and the maximum static friction is F0 = 5N? (2) When f = 26n, what is the friction between a and B? What are the accelerations of a and B at this time?
- 2. On the horizontal plane, there is a wooden block with a mass of 1kg. Under the action of a force of 5N on the right side of the horizontal plane, 3Q is obtained
- 3. The friction force between the object with a mass of 1kg and the horizontal plane is 5N. Under the action of 10N horizontal force, the object starts to move forward from static state, When the external force is removed after 2 m forward, the object continues to move forward for 1 m. at this time, what is the speed of the object? The object finally stops moving, and its total displacement is?
- 4. When two forces of 2n and 3N act on an object with a mass of 1kg at the same time, will the acceleration of the object be 0 to 5N
- 5. The friction coefficient between the object and the horizontal plane is 0.2 The friction coefficient between the object and the horizontal plane is 0.2. What is the velocity of the object at the end of 2S? If f is changed to vertical downward pressure after 2S, how far can the object move?
- 6. When an object with a mass of 1kg is placed on a rough horizontal plane, the dynamic friction factor μ = 0.1 and the horizontal tension f = 10N, the acceleration is calculated
- 7. Put an object with a mass of 1kg on a horizontal plane, use 8N horizontal pulling force to make the object move from rest, the dynamic friction coefficient between the object and the horizontal plane is 0.2, and remove the pulling force when the object moves for 2S. (G is taken as 10m / S2) calculate: (1) the kinetic energy of the object at the end of 2S. (2) the maximum distance that the object can slide forward on the water plane after 2S
- 8. The dynamic friction coefficient between the object with mass m = 1kg and the horizontal plane is 0.5. Under the action of horizontal tension f = 10N, the object starts to move from static state, and (1) the object passes through 2.5m If the horizontal pulling force is removed when the object passes through 2.5m, how far can the object move
- 9. Put an object with a mass of 1kg on a horizontal plane, use 8N horizontal pulling force to make the object move from rest, the dynamic friction coefficient between the object and the horizontal plane is 0.2, and remove the pulling force when the object moves for 2S. (G is taken as 10m / S2) calculate: (1) the kinetic energy of the object at the end of 2S. (2) the maximum distance that the object can slide forward on the water plane after 2S
- 10. As shown in the figure, the ball with a mass of 1kg is put on a fixed straight rod, and the rod is pressed at an angle of 30 degrees with the horizontal direction. The dynamic friction factor between the ball and the rod is u = 2 As shown in the figure, a small ball with a mass of M = 1kg is put through a fixed straight rod, and the rod is pressed at an angle of 30 degrees with the horizontal direction. The dynamic friction factor between the ball and the rod is u = one-third of the root of 2, and the vertical upward pull force of the small ball player is f = 20n. Then the acceleration of the small ball sliding along the rod is
- 11. The football player kicks the football into the air. If the air resistance is not taken into account, figure 1 shows the force diagram of the football flying in the air
- 12. As shown in the figure, the ball is released from rest at the left end. In the process of swinging from left to right, regardless of air resistance, then () A. In the process of moving from the highest point to the lowest point, part of the gravitational potential energy is converted into kinetic energy B. in the process of moving from the lowest point to the highest point, part of the kinetic energy is converted into gravitational potential energy C. the height of the highest point on the left is greater than that of the highest point on the right D. the height of the highest point on the left is equal to that of the highest point on the right
- 13. When a small ball falls from the height h above the ground, the air resistance of the ball in the process of movement is k times of its gravity. When the ball collides with the ground, it can rebound at the same speed. Then the total distance of the ball from release to stop bouncing is______ .
- 14. The small ball with mass m falls from a standstill at the height h from the mud pond, regardless of the air resistance 15. The small ball with mass m falls from a static position at the height h from the mud pool, and it falls on the mud pool and then goes deep into the mud pool without considering the air resistance. As shown in the figure, what is the average resistance of the small ball moving in the mud pool? The small ball with mass m falls from a standstill at the height h from the mud pool, and it falls on the mud pool and then goes deep into the mud pool for h without considering the air resistance. As shown in the figure, how much is the average resistance of the small ball moving in the mud pool?
- 15. As shown in the figure, a small ball is tied with a string to make it move in a uniform circular motion in a horizontal plane, regardless of air resistance A. Only by gravity B. only by tension C. by gravity, tension and centripetal force D. by gravity and tension
- 16. As shown in the figure, on the smooth slope with an inclination angle of θ = 30 °, there are two wooden blocks a and B connected by light springs. It is known that the mass of a is 2kg, and the mass of B is 3kg. There is a constant force F = 50nd acting on A. at the moment when AB has the same acceleration, remove the external force F. what are the accelerations of a and B at this moment?
- 17. As shown in the figure, the fixed smooth surface in the elevator has an inclination angle of 30 ° and the lower end of the spring on the inclined surface is connected with a wood block with a mass of M = 4kg. When the elevator descends at an acceleration of 2m / S ^ 2, the elevator will be able to move forward seek Spring force Write the support of the face to the block
- 18. Assuming that the inclined plane is smooth and the air resistance is not considered, the reason for the change of the movement state of baseball is that
- 19. A slider is ejected by a compression spring fixed at the bottom of the smooth slope. Assuming that the smooth slope is infinitely long, the slider will always slope upward evenly Fast linear motion or will it slide down after a while? Why?
- 20. As shown in Figure 1 on the right, the wooden block ejected by the spring from the bottom of the inclined plane suffers (regardless of air resistance) during sliding out along the smooth inclined plane