Gravitation

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Given: Height (h) = 20 m, Initial velocity (u) = 0 m/s, g = 10 m/s² Using s = ut + ½gt² 20 = 0 + ½ × 10 × t² 20 = 5t² t² = 4 t = 2 seconds The stone takes 2 seconds to reach the ground.

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According to Newton's universal law of gravitation, acceleration due to gravity (g = GM/R²) is independent of the object's mass. The gravitational force F = mg, but acceleration a = F/m = g, which can…

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Without air resistance, both would fall at the same rate. However, with air present: The stone falls downward due to gravity being stronger than air resistance. The helium balloon rises because it's l…

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Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between the…

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Weight on Moon = (1/6) × Weight on Earth Weight on Moon = (1/6) × 60 N = 10 N This is because the Moon's mass is much smaller than Earth's mass, resulting in weaker gravitational pull. The object's ma…

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A ship has a hollow structure with large volume, making its overall density less than water. The upthrust (buoyant force) from water is greater than the ship's weight, so it floats. An iron nail is so…

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Compare the object's density with water's density (1 g/cm³): 1. If object density < water density → Object floats 2. If object density > water density → Object sinks 3. If object density = water densi…

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Given: m₁ = 10 kg, m₂ = 20 kg, d = 2 m, G = 6.7 × 10⁻¹¹ N m² kg⁻² Using F = G(m₁×m₂)/d² F = (6.7 × 10⁻¹¹ × 10 × 20)/(2)² F = (6.7 × 10⁻¹¹ × 200)/4 F = 3.35 × 10⁻⁹ N The gravitational force is 3.35 × 1…