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I'm using Delphi 1 16-bit to learn Pascal (don't laugh, it works fine, plus I can't afford a more recent version). I'm using a TList to hold object references for a simple address book. Each object is added to the TList like so:
DataList.Add(TAddrBookData.Create('Bob', '1 Mill St'));
Do I need to free the TAddrBookData objects myself? Or are they freed when TList.Free is run?
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An object that is moving only because of the action of gravity is said to be free falling and its motion is described by Newton's second law of motion.
vf = g * t where g is the acceleration of gravity. The value for g on Earth is 9.8 m/s/s. The above equation can be used to calculate the velocity of the object after any given amount of time when dropped from rest.
Newton's First Law: Inertia Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
As learned in an earlier unit, free fall is a special type of motion in which the only force acting upon an object is gravity.
You need to free them yourself. Later versions come with a TObjectList, which is like a TList except it will only accept objects and it has the option to take ownership and free them for you automatically when the list is freed. But I don't believe TObjectList existed in Delphi 1, so you'll have to take care of it manually.
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