Why does barbell feel easier than dumbbell?

Question

After 4 months, I recently went from 7.5kg dumbbells to 10kg dumbbells and it feels really heavy whenever I lift above my chest level. like my shoulders and back have a hard time doing the exercises. But 2 days ago I bought a barbell and loaded it with 28 kgs I was comfortably ( little bit challenging) able to do my exercises. I dont understand why the dumbbells feel so difficult to work with.

In: 30

Answer 1

The answer lies with ‘center of gravity’ and how that affects the effort needed to lift/hold things.

Same reason why it’s easier to lift a 30lb dumbbell than a 30lb child.