Out with LED works but not with car.

i have worked many of beginning programs start working arduino uno. purchased radio control car (with no controller 72mhz) learn how more controls. when using simple blink program, led in place works fine. when replace led leads car motor, nothing happens. car uses 3 aa batteries, assumed 5v arduino enough. multimeter shows .25v @ car motor. have tried using different digital outputs 9 instead of written 13 no change.  if plug car directly 5v connection, motor works fine. doing wrong?

thanks
:~

there not enough power ma on usb port, 500ma
the output pin can deliver 40ma max.
aa batteries have 1000 - 2000ma power.
don't confuse volts ma or amps.

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