Set in motion and Switch on

Set in motion verb - Get going; give impetus to.

Switch on and set in motion are semantically related in start a function topic. In some cases you can use "Switch on" instead a verb phrase "Set in motion", when it comes to topics like start the operation of.

Switch on verb - Cause to operate by flipping a switch.

Set in motion and switch on are semantically related in start a function topic. You can use "Set in motion" instead a verb "Switch on", if it concerns topics such as start the operation of.