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Gravity and Mass-Calculation Simplified Revision Notes

Revision notes with simplified explanations to understand Gravity and Mass-Calculation quickly and effectively.

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Example: Gravity and Mass Calculation

Introduction

  • To understand how gravity and mass are related, let's explore a practical example involving the Earth and an object.

Scenario

  • Consider an object with a mass of 10 kilograms (kg) placed on the surface of the Earth.
  • We want to calculate the force of gravity acting on this object.
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Step 1: Understanding the Variables

  • Mass of the object (m): 10 kg
  • Gravitational constant (G): Approximately 6.674 × 10⁻¹¹ N m²/kg²
  • Mass of the Earth (M): Approximately 5.972 × 10²⁴ kg
  • Radius of the Earth (r): Approximately 6,371,000 meters (m)

Step 2: Applying Newton's Law of Universal Gravitation

  • We can use Newton's law to calculate the gravitational force (F) as follows:
  • F = G × ((m × M) / r²)

Step 3: Plugging in Values

  • Substituting the known values into the formula:
  • F = (6.674 × 10⁻¹¹ N m²/kg²) × ((10 kg × 5.972 × 10²⁴ kg) / (6,371,000 m)²)

Step 4: Calculating the Force

  • Now, we calculate the force:
  • F = (6.674 × 10⁻¹¹) × ((10 × 5.972 × 10²⁴) / (6,371,000)²)

Step 5: Simplifying the Calculation

  • F = (6.674 × 10⁻¹¹) × (5.972 × 10²⁵ / 4.054 × 10¹³)

Step 6: Calculate the Resulting Force

  • Calculate the force of gravity:
  • F ≈ 9.8 N (approximately)

diagram


Example: Gravity & Mass Calculation

Physics

Diagram

Diagram

Conclusion

  • The gravitational force acting on an object with a mass of 10 kg on the surface of the Earth is approximately 9.8 Newtons (N).
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