When the are two or more forces applies to an object but there is no net force, and thus no acceleration, we say that the forces are in equilibrium.
This is a direct consequence of Newtons First Law of motion.
As a result, situations when this is the case can be analysed, where the force vectors can be added up in such a way that the equal to zero.
This is a direct consequence of Newtons First Law of motion.
As a result, situations when this is the case can be analysed, where the force vectors can be added up in such a way that the equal to zero.
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Using weights and pulleys, a situation can be in equilibrium, where there is no net force. This video looks at the situation and helps you mathematically analyse the situation |
Sample Problem
We are now ready to try a sample problem
Below is a sample problem with a video that explain how to solve it. It is suggested you try the problem beforehand, as this actually aids understanding, even if you are unsure if you are correct.
We are now ready to try a sample problem
Below is a sample problem with a video that explain how to solve it. It is suggested you try the problem beforehand, as this actually aids understanding, even if you are unsure if you are correct.
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Check your understanding
Interactive
The following interactive, from Walter Fendt, is a useful to explore and assess your understanding of force in equilibrium.
Set the masses and then calculate the angles and see if you agree with the angles provided
The following interactive, from Walter Fendt, is a useful to explore and assess your understanding of force in equilibrium.
Set the masses and then calculate the angles and see if you agree with the angles provided
Another problem to try
- Examine the diagram below. Calculate the tensions in the ropes. (885 N, 1085 N)
Here is a worksheet on equilibrium situations (includes answers)
