This is an instructional short paradigm built from the source verb:
CategoryFormSense
PastاِنْكَسَرَIt broke
PresentيَنْكَسِرُIt breaks
Verbal nounاِنْكِسَارٌBreaking / becoming broken
Active participleمُنْكَسِرٌBroken / undergoing breaking
ImperativeاِنْكَسِرْBreak (yourself)
The past starts with in-, while the present starts with yan-. The imperative is included for morphology; whether it is naturally commanded depends on context.