a strong 100 kg man pushes down hard on the left piston. What happenes to the 10 kg mass on the right? The answer is the moves down, lifting the left piston despite the strong man. BUT WHY?

The 10 kg mass on the right moves down and lifts the left piston despite the strong man pushing down on it due to the principles of Pascal's law and hydraulic systems.

To understand why this happens, let's consider Pascal's law, which states that when a pressure is applied to an enclosed fluid, it is transmitted equally in all directions. In the case of a hydraulic system, this means that any force exerted on a piston in a closed system is transmitted equally to all other pistons connected to the same system.

In this scenario, the strong man is exerting a downward force on the left piston, creating a high pressure within the fluid trapped in that side of the system. According to Pascal's law, this pressure is transmitted equally throughout the fluid, including to the right side of the system where the 10 kg mass is located.

As a result, the pressure on the right side of the system increases, pushing the 10 kg mass downwards. This downward force created by the 10 kg mass exceeds the force applied by the strong man on the left piston, causing the left piston to move upwards, despite the man's effort to push it down.

In summary, the pressure created by the strong man on the left piston is transmitted equally throughout the fluid, causing the 10 kg mass on the right to move down and lift the left piston due to the principles of Pascal's law and hydraulic systems.