A worked-examples animation showing how to calculate torque about different pivot points on a rigid body. Using a force applied at an angle, it walks through computing moments about points A and B with sign conventions for rotation direction, then applies the same method to a new point C and a simple perpendicular-force case. Useful for physics students and teachers reviewing torque, lever arms, and moment calculations.
Narrated · 16:9 · Preview before teaching · automatic layout checks do not establish subject accuracy
Scene 5: Solved Examples (Problems 1, 2, & 3)Problem 1 (Solved Main Example):Visual Prompt: Graphic illustration of a 2D rigid shape with a 4.0 N force applied at 60° relative to line AB (distance OA = 4.0 m, OB = 3.0 m). Voiceover & Step-by-Step Breakdown:Given: F = 4.0 N, θ = 60°, Distance to A = 4.0 m, Distance to B = 3.0 m, sin(60°) ≈ 0.866. (A) Torque around Point A:Why? Force rotates counter-clockwise around A (+ sign). Calculation: M_A = + F * L * sin(θ) = + 4.0 * 4.0 * sin(60°) = + 13.86 N·m Result: +14 N·m (Counter-clockwise). (B) Torque around Point B:Why? Force rotates clockwise around B (- sign). Calculation: M_B = - F * L * sin(θ) = - 4.0 * 3.0 * sin(60°) = - 10.39 N·m Result: -10 N·m (Clockwise). Problem 2 (Try It Yourself - Point C):Visual Prompt: The same body with point C added on the line at distance 2.0 m from action point, rotated clockwise. Voiceover & Step-by-Step Breakdown:Given: F = 4.0 N, L = 2.0 m, θ = 60°, Clockwise direction. Calculation: M_C = - F * L * sin(60°) = - 4.0 * 2.0 * 0.866Result: -3.46 N·m (Clockwise). Problem 3 (Quick Application):Visual Prompt: A horizontal rod of length 0.40 m with a perpendicular upward force of 5.0 N applied at the right end. Voiceover & Step-by-Step Breakdown:Given: Perpendicular force F = 5.0 N, Lever arm d = 0.40 m. Calculation: M = F * d = 5.0 * 0.40Result: +2.0 N·m (Counter-clockwise). IMPORTANT LANGUAGE RULE: All on-screen text must be in Arabic EXCEPT mathematical equations, formulas, laws, symbols, variables, and numerical expressions. Keep every equation, formula, and law exactly as provided, without translating or changing it. Translate only the explanatory text, headings, labels, and descriptions into Arabic. Arabic text must use proper RTL direction and correct Arabic typography. Do not use English text anywhere else on the screen. Audience: student