An object or body is in static equilibrium because the vector sum of all external forces is:

Question

BlackTom AI · Accepted Answer

When an object is in static equilibrium, it means there is no net force acting on it; the object does not accelerate. This condition is mathematically expressed as the vector sum of all external forces being zero.
Option A: 'A. Equal to zero' states that the net external force sums to zero. This is precisely the definition of static equilibrium, so this option is consistent with the fundamental condition for no acceleration.
Option B: 'B. Slightly negative' suggests a nonzero net force in the negative direction. A nonzero net force would produce acceleration, contradicting static equilibrium, so this is incorrect.
Option C: 'C. Equal to body mass times acceleration due to gravity' would mean the net force equals the weight of the body, which is only the case if the only force were gravity or if the system is designed to have a specific balance with support forces. In static equilibrium, the net external force must be zero, not equal to mg, so this is false.
Option D: 'D. Always positive' implies a net force in the positive direction, which would again lead to acceleration. Static equilibrium requires the resultant force to be zero, not consistently positive, so this is incorrect.
Putting it together, the only option that aligns with the condition of static equilibrium is the net external force being zero, while the other options describe scenarios that would produce motion or acceleration rather than equilibrium.

An object or body is in static equilibrium because the vector sum of all external forces is:单项选择题

类似问题

An object rests on an inclined slope. Which of the following statements is true?

An object rests on an inclined slope. Which of the following statements is true?

For the free body diagram shown. What is the magnitude of the force on A, if the object is in equilibrium?

For the free body diagram shown. What is the magnitude of the force on A, if the object is in equilibrium?

Determine the force F required to keep the lever stationary as shown in the figure below. The mass of the object is 30 kg. Assume the gravitational acceleration to be 9.8 m/s2. Provide your answer in N to 4 decimal places.

A uniform beam of mass 5 kg is hinged to a wall and supported at its outer end by a wire as shown. The outer end supports a 10 kg load, also shown: The tension in the wire is:

What was the world's first widely adopted biodiversity policy?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单