Title 2. Universal law of Gravitation.pdf ✅

UNIVERSAL LAW OF GRAVITATION 10 GRAVITATION Class 9th Science (Physics) (Answers Key) 1 3.335 × 10-9 N 2 It becomes one-fourth of the original force 3 5 seconds 4 Charge of Object 1 5 98 N 6 “Every single body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.” ⇒ F = G × m1 × m2 r 2 7 Here, g = 0 at the centre of the Earth, and weight is the product of acceleration due to gravity and the mass of the object, w = mg. Hence w = 0 at the centre of the Earth. 8 m1 = 3kgs m2 = 4kgs r = 5m ⇒ F = G × m1 × m2 r 2 = 6.67259 × 10–11Nm2/kg2 × 3kg × 4 kg/5m2 F = 3.2037 × 10–11 N 9 m1 = 80kg, m2 = 100kg, r = 6m and G = 6.67259 × 10–11 Nm2 /kg2 F = G × m1 × m2 r 2 = 6.673 × 10–11 × 80 × 100 36 F = 148.28 × 10–11N 10 Given F1 = 4 Hence, F1 = G × m1 × m2 r 2 ... (1) F2 = G × m1 × m2 4r 2 ... (2) Dividing equation 1 by 2, Page 1 Email: Phone No: Website: [email protected] +91 93299 65211 www.brisklearning.com Address: Office No. 605, CTS No. 658, Gayatri Bhuvan, A & B, Kandivali, Dattani Park, Thakur Village, Kandivali East, Mumbai, Maharashtra 400101