Ananya Reddy11thSample· 20d ago
Does friction always do negative work? Also why is work zero when I hold a heavy bag still?
Work, Energy and Power. I made a table of "who does positive / negative / zero work" and several rows don't feel right to me. W = \vec F\cdot\vec d = Fd\cos\theta . I get: - Lifting a book at constant speed by h : work d
