Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

8. Centripetal Forces & Gravitation

Newton's Law of Gravity

Physics

8. Centripetal Forces & Gravitation

Newton's Law of Gravity

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Multiple Choice

Gravitational Force: At what point is a spaceship traveling to the Moon beyond the pull of Earth's gravity?

When it is at the Lagrange point L1

When it is 100,000 kilometers from Earth

When it is outside Earth's atmosphere

When it reaches the halfway point between Earth and the Moon

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Verified step by step guidance

Understand the concept of gravitational force: Gravitational force is the attractive force between two masses. The force decreases with the square of the distance between the two masses.

Learn about Lagrange points: These are positions in space where the gravitational forces of two large bodies, such as Earth and the Moon, balance the centripetal force felt by a smaller object. L1 is one such point where the gravitational pull of Earth and the Moon are equal.

Consider the gravitational influence: Earth's gravitational pull decreases with distance, but it never truly disappears. The spaceship will be influenced by Earth's gravity until it reaches a point where the Moon's gravity becomes significant.

Identify the Lagrange point L1: This is the point where the gravitational forces of Earth and the Moon balance each other. It is not simply a distance from Earth but a specific location where the forces are equal.

Evaluate the options: The spaceship is never truly beyond Earth's gravity, but at L1, the gravitational forces are balanced. The other options, such as being 100,000 kilometers from Earth or outside Earth's atmosphere, do not account for the gravitational balance between Earth and the Moon.