Washer trips circuit breaker

Is washer relatively new? Check circuit breaker for proper size (20 AMPS). Washer must also be on its own circuit. It appears that when the motor starts up it is causing a spike in current (as with any motor), so the breaker is either undersized (Note that if breaker is undersized and you up it to the next size you would also need to replace the wire with the next size up which would be 12/2 with ground), or if you have had your washer a while which I believe is your case the circuit breaker is weakening and is tripping on the current spike. Try swapping out your circuit breaker with a new one and try running the washer again.