How to control a 12v motor with a momentary switch

[PaulRB]

@spicyphoton

The behavior I would like is as follows:

When switch is open, turn motor on.
When switch is closed, turn motor off

Is this what you really meant?

When switch is not pressed, turn motor on.
When switch is pressed, turn motor off.

Solution: use a normally closed switch. No arduino or MOSFET required, but check the switch is rated for the motor current.

@spicyphoton

The motor is also 12v dc and i belive the power off the arduino is only 5v. So I need the arduino to send a signal to the mosfet to send power from a 12v battery to the motor when the switch is opened.

Correct, the Arduino is only 5V, and even if the motor was 5V, the current would be too high for Arduino.

But even if you truly need the motor to be on when the switch is open, you still don't need an Arduino.

Just pull the MOSFET gate up to 12V with a 10K resistor and connect the switch between the MOSFET gate and ground.