In Android Lollipop you receive through your smartphone a so-called "Haptic feedback" when you make interactions. This can be for example touching the display. If you don´t want to use the "Haptic Feedback" then you must set the following setting in Android Lollipop to disable this feature:
Open on your Android smartphone, the app menu an then the Settings. Tap on "Sounds and Notifications" and then on "vibration intensity". You will find various sliders which allow you to control the vibration intensity of your smartphone. This includes the haptic feedback. Move the slider at the bottom all the way to the left to completely turn off the haptic feedback on your Android lollipop smartphone. From now on your smartphone with android Lollipop gives you no more haptic feedback when you do interactions.