Final answer:
Forgetting to put a bobbin in a sewing machine can cause fabric bunching, needle breakage, and jamming of the pedal.
Step-by-step explanation:
If you forget to put a bobbin in your sewing machine before using it, several issues can arise.
The fabric may bunch up, causing uneven stitches and potentially damaging the fabric. This happens because the bobbin is responsible for feeding the thread from underneath the fabric, and without it, the top thread doesn't form proper stitches.
Additionally, the needle may break as it tries to sew without a bobbin, putting excessive strain on the machine. Lastly, the pedal may jam if the thread gets tangled without the stabilizing presence of the bobbin.
Learn more about sewing machine bobbin