• Inertia and Gravity's Role in Planetary Orbits: Planets orbit the sun due to the interplay of inertia (an object's tendency to maintain its motion) and gravity (the attractive force between objects). Inertia keeps planets moving forward, while gravity pulls them towards the sun, resulting in a curved path.
• The Combined Effect of Inertia and Gravity: Inertia causes a planet to travel in a straight line, but gravity continuously pulls it towards the sun, bending its path into an orbit (either circular or elliptical). The balance between these forces maintains the orbit. • Analogy to a Hammer Throw: The example of a hammer thrower illustrates the concept. The thrower's hand (gravity) and the hammer's inertia work together; the inertia wants the hammer to fly straight, while the thrower's hand pulls it inwards, creating a circular motion similar to a planet's orbit.
Enjoy this worksheet and answer key that go along with the video.
Inertia and Gravity Answer Key
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