AP Physics 1 Kinematics (Describing Motion) - Should you use +9.8 or -9.8 for acceleration?

🎯 FREE AP Physics 1 Semester 1 Review Guide https://free.thephysicsuniverse.com/review 🚀 The Smart Physics Guide A clear and organized study guide with key concepts, concept checks, and common mistakes for AP Physics 1. https://shop.thephysicsuniverse.com/b/smart Learn whether to use +9.8 m/s/s or -9.8 m/s/s when solving free fall problems. We'll work out a problem using both and see if we get the same answer. We will define up "positive" in one problem, then define down "positive" in another. 📺 Recommended playlists: Physics: https://www.youtube.com/playlist?list=PL5mhjj_ffJDnoRs3Z-F6GTKz_XZEOU7_w AP Physics 1 Review: https://www.youtube.com/playlist?list=PL5mhjj_ffJDms6Qd4xF4LXUjaCGIystCn Kinematics: https://www.youtube.com/playlist?list=PL5mhjj_ffJDk4ph71VeXl0vIcMOmIXYPs 2D Kinematics: https://www.youtube.com/playlist?list=PL5mhjj_ffJDmt4XLa-JvGu0szGIET1ifh Dynamics: https://www.youtube.com/playlist?list=PL5mhjj_ffJDlCw4_rOKoIq5dljOHk8rSV Momentum: https://www.youtube.com/playlist?list=PL5mhjj_ffJDmvE2GMSt1_V-4m18vdVbb0 Energy: https://www.youtube.com/playlist?list=PL5mhjj_ffJDlJl1bInpo_5zAKlOydEhqs Rotational Motion: https://www.youtube.com/playlist?list=PL5mhjj_ffJDliyx9O6N1QA6vaWBd_tVgG Electric Circuits: https://www.youtube.com/playlist?list=PL5mhjj_ffJDntpXdBpFfEcbMBSrBKnNIj Optics: https://www.youtube.com/playlist?list=PL5mhjj_ffJDnx9ZXof1-uybIW8ZL2KrW5 ⏰Chapters⏰ 0:00 Acceleration Due to Gravity 0:42 Defining Positive Direction 1:44 Defining Down "Positive" 5:00 Defining Up "Positive" Thanks for watching!