Here's why:
* Closed Syllable: A closed syllable ends in a consonant. In "cap," the vowel "a" is followed by the consonant "p."
* Short Vowel Sound: In closed syllables, the vowel sound is typically short. The "a" in "cap" makes a short "a" sound, like in "cat" or "hat."
Therefore, while "cap" is a short word, the sound of "cap" itself is not short. The vowel sound is short due to the closed syllable structure.