This animation walks through worked physics problems on linear collisions, showing spheres moving in opposing directions, elastic and perfectly inelastic cases where objects stick together. Each scene displays initial and final velocities, calculates momentum before and after impact to confirm conservation, and computes the kinetic energy lost during collision. Useful for students practicing momentum and energy calculations and for teachers demonstrating step-by-step problem-solving in mechanics.
Narrated · 16:9 · Preview before teaching · automatic layout checks do not establish subject accuracy
Scene 8: Exercise (b) - Head-on Opposing Motion Collision On-Screen Title: Exercise (b): Opposing Direction Collision Question: Sphere A ( 0.10 kg ) moving right at 3.0 m/s collides with sphere B ( 0.20 kg ) moving left at 2.0 m/s . After collision, A moves left at 1.0 m/s and B is stationary. (i) Deduce that momentum is conserved, (ii) Find the lost kinetic energy after collision in Joules. PNG Answer: (i) Initial momentum = (0.1)(3)+(0.2)(−2)=−0.1 kg⋅m/s ; Final momentum = (0.1)(−1)+(0)(0)=−0.1 kg⋅m/s (Conserved). PNG (ii) Initial E k =0.45+0.40=0.85 J ; Final E k =0.05+0=0.05 J ; Lost Energy = 0.80 J . PNG Scene 9: Exercise (c) - Inelastic Sticking Collision On-Screen Title: Exercise (c): Inelastic Sticking Collision Question: Sphere A ( 1.0 kg ) moving right at 4.0 m/s collides with stationary sphere B ( 1.5 kg ) and they stick together. (i) Find the velocity of the stuck spheres, (ii) Find the lost kinetic energy after collision in Joules. PNG Answer: (i) v f = 1.0+1.5 (1.0)(4.0) =1.6 m/s . PNG (ii) Initial E k =8.0 J ; Final E k =3.2 J ; Lost Energy = 4.8 J . PNG Scene 10: Exercise (d) - Opposing Movement Sticking Collision On-Screen Title: Exercise (d): Opposing Direction Sticking Collision Question: Sphere A ( 0.20 kg ) moving right at 10 m/s collides with sphere B ( 0.30 kg ) moving left at 5.0 m/s , and they stick together. (i) Find the velocity of the stuck spheres, (ii) Find the lost kinetic energy after collision in Joules. PNG Answer: (i) v f = 0.2+0.3 (0.2)(10)+(0.3)(−5) = 0.5 2.0−1.5 =+1.0 m/s . PNG (ii) Initial E k =10.0+3.75=13.75 J ; Final E k = 2 1 (0.5)(1.0) 2 =0.25 J ; Lost Energy = 13.5 J . PNG 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