Gravitational enerygy
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Gravitational enerygy

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This is Joshua J's amazing power point demonstrating gravitational energy!

This is Joshua J's amazing power point demonstrating gravitational energy!

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Gravitational enerygy Gravitational enerygy Presentation Transcript

  • Gravitational Energy by Joshua Jordan (3M) 2011 Note: Presentation requires an active internet connection
  • What is gravity?
    • Gravity is one of the most mysterious and least understood forces of nature by man.
    • Gravity is the force, or power, that tries to pull objects towards each other. The bigger an object is and closer you are, the stronger it’s gravitational pull.
  • Earth’s gravity
    • Earth’s gravity is what keeps us on the ground and not float away, and is also what causes objects to fall to the ground like an apple on a tree.
    • Every time you jump, you experience gravity. It pulls you back down to the ground. Without gravity, you’d float off into the atmosphere. You see gravity at work any time you drop a book, step on a scale or toss a ball up into the air.
  • Who discovered gravity?
    • Sir Isaac Newton first wrote about gravity in 1687. He discovered gravity earlier than this, in 1665, when he saw an apple fall from a tree. He thought that the same thing that pulled the apple to the ground held the moon in its orbit of the Earth, this he called gravity. He later said gravity held the planets in orbit around the Sun.
    • Albert Einstein added to Newton’s work in 1916, and said that in addition to size, gravitational energy is affected by the speed of an object.
  • Gravity and the planets
    • Gravity is what holds the planets in orbit around the sun. It is also what gives us weight and holds us on the ground. Gravity is different on Earth than it is on the moon or smaller planets in the solar system.
  • Using gravitational energy in sport Winter Olympic Games
  • Bobsled
  • Bobsled – how it works
    • Start:
    • Bobsled starts at the top of the mountain. The team runs fast on the starting ramp while pushing the bobsled. They get in before the bobsled goes down the slope.
    • Then gravity takes over.
  • Bobsled – how it works
    • Middle:
    • Gravity makes the bobsled go faster while going downhill. The driver has to steer the bobsled on the track through straight sections and turns.
    • The bobsled goes fastest through the steep sections of the track because of gravity.
  • Bobsled – how it works
    • End:
    • The bobsled comes to the finish line at the bottom of the mountain. As it does, it slows down because the track is flat, and gravity is no longer causing it to move forward.
  • Snowboarding & ski jump Snowboarders use gravity to move down the track and increase speed. When they are going fast enough they jump into the air and do tricks before gravity brings them back to the ground. Ski jumpers start at the top of a big ramp. Gravity makes them speed up until they get to the end of the ramp. They fly into the air and try to go as far as they can down the mountain before they land.