What is the effect of aircraft weight on V1 during takeoff?

During takeoff, V1 is the maximum speed at which a decision can be made to continue the takeoff or abort it safely. As the weight of the aircraft increases, the required takeoff distance also increases due to the higher energy needed to lift the additional mass off the ground. Consequently, the takeoff speed (V1) at which this decision is made becomes lower when the aircraft is heavier to ensure safety and efficiency. Therefore, higher aircraft weight leads to a decrease in V1 to accommodate the longer takeoff distance required and to provide a margin of safety against exceeding the runway length available. This ensures that pilots can still make a safe decision during the critical phase of takeoff, even when operating at heavier weights.