We take two identical pulleys, both with string wrapped around them. On the one on the left we apply an 8 N force to the string. On the one on the right we hang an object with a weight of 8 N. Which pulley has the larger angular acceleration?

1. The one on the left
2. The one on the right
3. Neither, they're equal

The one on the left, because the tension in the string is 8 N. The tension in the string on the right is less than 8 N, because it is given by:

mg - T = ma

T = mg - ma = 8 - ma