No. Willpower is self-control, but motivation is incentive.
For instance, consider the context of weight loss. Willpower is what you use to say no to the offer of cake or to push yourself to exercise when you really don't want to, but know that you must. Motivation here would be knowing you can fit into smaller clothes, knowing you made the team, being able to pass the physical fitness test, knowing you have better health, etc.
The word willpower is usually spelt as a single word.
Motivation, stimulation.
By willpower alone.
Motivation is used a noun in the sentence.
Kim's desire to be rich was her motivation for studying in school.
Another word to describe the size of a force would be "Magnitude". Be careful though; force is a vector quantity, meaning it has both a magnitude and a direction. By using the word magnitude you are referring specifically to the value of the size of the force.
Willpower has three syllables.
Motivation, stimulation.
willpower
The Malayalam word for motivation skill is "ഉദ്ദേശക്കുറിപ്പ്" (uddeśakkuṟippu).
Excitement, passion, zeal, exhilaration, fervor...
By willpower alone.
Motivation is used a noun in the sentence.
widow, wow, wowser, withdraw, window, willow, willpower
Aim Motive Cause Goal Purpose Object Motivation Intention
You may say 'chikara.'
Lady Willpower was created in 1968.
Motivation