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So, my teacher drew on the board my attachment. The mass, lower case m, is accelerating both itself, and mass, Upper case M. The lowercase m mass is 10 g and the uppercase M mass is 90g

He then did the following to calculate the acceleration:

a = F / m

a = 0.1 N / 0.1 kg = 1 m/s

Ok, but then he wants to calculate the Tension on the string, the red arrows in the diagram. Now, if there's any tension in the string, how could he have used the weight of the lowercase m block as the resultant force in the acceleration calculation? The resultant force should be the W - T, I thought we couldn't calculate the acceleration without the tension!

Anyone can help me with this?

Thanks!

He then did the following to calculate the acceleration:

a = F / m

a = 0.1 N / 0.1 kg = 1 m/s

Ok, but then he wants to calculate the Tension on the string, the red arrows in the diagram. Now, if there's any tension in the string, how could he have used the weight of the lowercase m block as the resultant force in the acceleration calculation? The resultant force should be the W - T, I thought we couldn't calculate the acceleration without the tension!

Anyone can help me with this?

Thanks!