Stepping Down Voltage to power DC motor
You have a few problems.


The 741 is a 40 year-old design. It's output can't swing close to the negative rail. You need something better.
The motor's coil resistance is only 15 Ω and requires 60 to 100 mA and 150 mA when stalled - and possibly on start.
Table 6.5 of the 741 datasheet states that the short-circuit current of the op-amp is 25 mA. It can't drive your motor.








simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. A more practical circuit.

The motor is 15 Ω and needs about 1.5 V which is 10 Ω/V so R1 would need to be about 30 Ω to drop the 5 V supply down by 3 V.