It is important to note that an object can be in motion even if there are no forces acting on it. Balanced forces can be demonstrated in Hanging, Floating and Standing/sitting objects Hanging objects. Take a look at this hanging glass bulb shade.
Synthroid is covered by most Medicare and insurance plans, but manufacturer and pharmacy may be lower. The lowest GoodRx price for the most common version of Synthroid is around $4.00, 91% off the average retail price of $49.88. Compare thyroxines.
Levothyroxine is the generic form of Synthroid. Both are synthetic, so price is probably the deciding factor. Many doctors don't like to use the generic because of concerns over variations in the amount of medication in them versus the stated amount. Supposedly, the brand names are much more consistent.