Locks and Latches

Technically they don't need to, but it's a matter of convenience so you don't have to do angle subtraction or re-orient your paper.

Purchased a Brinks 5056 safe(at yardsale), and combination was accidentally locked inside, key works but will not open without combination. Contacted First Alert, said they had info I just needed to get notarized authorization to open, which I did, but now they say combination for that range of models is missing. How can I open safe?

This sentence is a declarative sentence.

Locked doors are less likely to open in a crash because the locking mechanism ensures that the door remains securely closed, even when subjected to high impact forces. Additionally, the structural integrity of the locked door may be better maintained during a crash compared to an unlocked door, reducing the chances of it opening unexpectedly. Lastly, in modern vehicles, safety features are designed to keep doors locked in the event of a crash to protect occupants from being ejected.

One long blast on the boat's horn or whistle indicates to the river lock attendant that you wish to go through the lock.

A doorknob provides a grip for the hand that allows for increased leverage when turning the latch. By rotating the knob, the mechanism inside the door is activated to either extend or retract the latch, making it easier to open or close the door.

Both the lock and key model and induced fit model are mechanisms used to describe enzyme-substrate interactions. Both models explain how enzymes bind to substrates to facilitate chemical reactions. They both highlight the specificity of enzyme-substrate interactions.