Which of the two systems in figure 4 do you think will need the largest motor?

To determine which of the two systems in figure 4 will require the largest motor, you would need to compare the power requirements of each system.

To do this, you should consider the following factors:
1. Load: Determine the total load or weight that each system needs to move or operate. This can be measured in terms of mass, force, or torque.

2. Speed: Consider the desired speed at which each system needs to operate. The motor must be powerful enough to deliver the necessary torque and speed to meet the system's requirements.

3. Efficiency: Assess the efficiency of each system, as it will impact the power required for operation. Higher efficiency can reduce the power demands on the motor.

4. Friction and Resistance: Evaluate the amount of friction or resistance present in each system. Higher friction or resistance will require a more powerful motor to overcome these forces.

By considering these factors, you can make an informed judgment about which system will need the largest motor. It's important to note that this analysis may require specific technical knowledge or calculations, depending on the details of the systems in question.