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Physics Lesson 6.4.6 - What if the bar is hanged on a string?
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Welcome to our Physics lesson on What if the bar is hanged on a string?, this is the sixth lesson of our suite of physics lessons covering the topic of Moment of Force. Conditions of Equilibrium, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
What if the bar is hanged on a string?
The approach and the physical principles involved are absolutely the same as those discussed above. Consider the following example:
Example 6
What is the mass of the object 3 (m3) in the system shown below if m1 = 6 kg? All bars and ropes are massless.
Solution 6
From the figure, we can see that the system is in equilibrium. Therefore, we can write for the left bar:
Simplifying g from both sides, we obtain after the substitutions
m2 = 30 kg
Therefore, we have for the two objects hanged on the small bar in the left,
= 6 kg + 30 kg
= 36 kg
Now we can use the same method to work out the mass m3. Thus,
36 × 2 = m3 × 5
m3 = 36 × 2/5
= 14.4 kg
You have reached the end of Physics lesson 6.4.6 What if the bar is hanged on a string?. There are 7 lessons in this physics tutorial covering Moment of Force. Conditions of Equilibrium, you can access all the lessons from this tutorial below.
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