What is the indication of both ends of a spring dynamometer with the same force? For example, if two forces are 5N, why is the indicator also 5N instead of adding or subtracting (composition / decomposition of forces)?
The action of forces is mutual. One spring dynamometer gives a force of 5N to another spring dynamometer, and the second spring dynamometer also gives a force of 5N to the first spring dynamometer
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- 1. What is the reading of the physical spring Dynamometer when both sides are pulled with 5N force? What is the reading with 10N force on both sides? What is the reading with 5N force on one side without force? Why
- 2. What is the indication when the two ends of the spring dynamometer are pulled by different forces? For example, 5N force at one end and 6N force at the other
- 3. The elevator is suspended with a spring scale on the ceiling, and a small ball is hung under the spring scale. When the elevator moves, the reading of the spring scale becomes larger Then why is the elevator moving downward to make uniform deceleration or upward to make uniform acceleration
- 4. The upper end of a light spring is fixed on the ceiling of the elevator, and an object is suspended at the lower end When the elevator is stationary, the spring elongation is 8 cm; later, it is found that the spring elongation is 12 cm. According to this, the movement of the elevator at this time may be () A. the acceleration is g / 2 B. The acceleration is g / 2 C. The acceleration is 3G / 2
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- 6. On the ceiling, there are four balls with the same electric quantity, a, B, C and D, suspended by insulated thin wires. A and B are negatively charged, C and D are positively charged. They are close to the positively charged object M. affected by the charged body m, the thin wires deflect, as shown in the figure (1) By observing the sacrificial deflection of ball a and ball B, we can draw the following conclusions (2) By observing the sacrificial deflection of the C and D balls of the system, we can draw the following conclusions (2) Compare the string deflection angle of a, B or C, D balls, what rule can you guess?
- 7. As shown in the figure, the two boards are sandwiched in the middle by baffles, and their masses are all m. calculate the friction between them
- 8. A long board of mass m is placed on a smooth horizontal surface A long board with mass m is placed on a smooth horizontal plane. A slider with mass m slides along the board surface from point a to point B at a certain speed v. it advances L on the board while the board advances S. if the dynamic friction coefficient between the slider and the board is μ, how much work does the friction force do to the slider and the board?
- 9. A long board with mass of M and length of L is placed on a smooth horizontal plane, and a small block with mass of M is placed at the rightmost end of the board Now add a horizontal constant force F to the right end of the long board, so that the long board is pulled out from under the small block, and the dynamic friction coefficient between the small block and the long board is μ, so as to find the work done by the horizontal constant force F to pull out the long board
- 10. As shown in the figure, on the inclined plane with an inclination angle of α, put a small ball with a mass of M, and the ball is blocked by a vertical board. Without friction, what are the pressures of the ball on the baffle and the inclined plane?
- 11. The two hands pull the spring scale with 6N force respectively. What is the indication of the spring scale?
- 12. Use both hands to pull a spring scale with 10N force at the same time, why is the indication still 10N? I don't understand that. Who knows? Explain
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