A bottle opener is a form of the lever that is designed to offer the best results for your needs. This is how you can open the cap using the opener. As a result, you can easily find four simple machines inside the bottle opener.
It is also quite easy to open the box cap by grappling the same using towel. This is because when you opt to hold the same using towel, the frictional force resulting from the same helps to keep it open using frictional force. Since the same is a simple lever that intensifies the force needed for opening the crown cap of the bottle.