In an educational setting, a girl may interact with a pendulum as part of a physics experiment or lesson. She may be asked to:
Through interacting with a pendulum, a girl can gain hands-on experience with fundamental physics concepts, including: girl fingering pendulum
: Use this if you are describing a general or first-time scene. The indefinite article "a" suggests it is one of many possible girls or pendulums. In an educational setting, a girl may interact