Why do you fiind it to hard to push a glass tumbler down into water?

Pushing a glass tumbler down into water is difficult due to the buoyant force acting on it. This upward force, which opposes the weight of the tumbler, increases as the tumbler is submerged deeper. Additionally, water creates resistance around the tumbler, making it harder to displace the liquid. Together, these factors make it challenging to push the glass downward.