Require vs. Required: What's the Difference?

Require and Required Definitions
Require
To have as a requisite or necessity; need or depend on
Do you require assistance? Most plants require plenty of water.
Required
Needed; essential
Missing several required parts.
Require
To stipulate as obligatory by authority
The law requires full disclosure of charitable donations.
Required
Obligatory
Required reading.
Require
To demand as obligatory or appropriate
Skiing requires practice.
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Required
Simple past tense and past participle of require
Require
To impose an obligation on; compel
The school requires all students to study mathematics.
Required
Necessary; obligatory; mandatory.
Require
(obsolete) To ask (someone) for something; to request.
Required
Necessary for relief or supply;
Provided them with all things needful
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Require
To demand, to insist upon (having); to call for authoritatively.
Required
Required by rule;
In most schools physical education are compulsory
Attendance is mandatory
Required reading
Require
Naturally to demand (something) as indispensable; to need, to call for as necessary.
Require
To demand of (someone) to do something.
Require
To demand; to insist upon having; to claim as by right and authority; to exact; as, to require the surrender of property.
Shall I say to CæsarWhat you require of him?
By nature did what was by law required.
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Require
To demand or exact as indispensable; to need.
Just gave what life required, and gave no more.
The two last [biographies] require to be particularly noticed.
Require
To ask as a favor; to request.
I was ashamed to require of the king a band of soldiers and horsemen to help us against the enemy in the way.
Require
Require as useful, just, or proper;
It takes nerve to do what she did
Success usually requires hard work
This job asks a lot of patience and skill
This position demands a lot of personal sacrifice
This dinner calls for a spectacular dessert
This intervention does not postulates a patient's consent
Require
Consider obligatory; request and expect;
We require our secretary to be on time
Aren't we asking too much of these children?
I expect my students to arrive in time for their lessons
Require
Make someone do something
Require
Have need of;
This piano wants the attention of a competent tuner