Final answer:
Twisting a doorknob involves the transfer of energy through the change in angular momentum, electric charge conduction, and conversion of mechanical work into electrical energy.
Step-by-step explanation:
Twisting a doorknob involves the transfer of energy in multiple ways. One way is the transfer of angular momentum. When you push or pull on the doorknob, the angular momentum of the system changes. Another way is through electric charge transfer if the doorknob is made of a conductor. If you touch the doorknob, electrons can move from your hand to the doorknob, resulting in a transfer of electric charge.
Additionally, twisting a doorknob also involves the conversion of mechanical work into electrical energy if the door has an electrical locking mechanism or if the twist of the knob activates a switch. The mechanical work exerted by your hand is converted into electrical energy to power the lock or switch.
In summary, twisting a doorknob involves the transfer of energy through the change in angular momentum, conduction of electric charge, and conversion of mechanical work into electrical energy.