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Activity Discussion Science & Technology Yo-yo go up and down

  • Glenda

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    May 30, 2024 at 3:39 pm
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    A yo-yo goes up and down through a combination of gravitational forces and the conversion of kinetic and potential energy. Here is a detailed explanation:

    1. Initial Release: When a yo-yo is released from the hand, gravity pulls it downward. As it falls, the string unwinds, and the yo-yo starts to spin due to the friction between the string and the axle.
    2. Kinetic Energy Conversion: The potential energy stored in the yo-yo as it rises is converted into kinetic energy of rotation as it falls. This kinetic energy of rotation is known as angular momentum.
    3. Climbing Back Up: As the yo-yo reaches the bottom of its string, the angular momentum is converted back into gravitational potential energy, causing the yo-yo to climb back up the string. This process continues until frictional losses slow it down, and the yo-yo eventually comes to rest at the bottom of the string.
    4. Maintaining Motion: To keep the yo-yo moving indefinitely, a slight upward pull is required to compensate for frictional losses. This pull can be combined with the initial tug to initiate the climb back up the string.
    5. Frictional Losses: Friction between the string and the axle, as well as air resistance, gradually dissipates the energy of rotation, causing the yo-yo to slow down and eventually come to rest.
    6. String and Axle Interaction: The string is wrapped around the axle, allowing the yo-yo to continue spinning at the bottom. When the string is tugged, the friction between the string and the axle increases, causing the yo-yo to climb back up the string.
    7. Timing and Catching: To catch the yo-yo, it is essential to wait until it reaches your hand, rather than trying to grab it as it falls. This ensures a smooth catch and prevents the yo-yo from falling to the ground.

    In summary, a yo-yo goes up and down by converting potential and kinetic energy through the interaction of gravity, friction, and the string and axle. Maintaining motion requires a balance of energy input and frictional losses to keep the yo-yo moving indefinitely.

  • Bunny

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    May 30, 2024 at 4:03 pm
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    A yo-yo goes up and down due to the principles of angular momentum and gravity.

    When you throw the yo-yo down, the spinning motion of the yo-yo creates angular momentum. This angular momentum causes the yo-yo to resist being pulled back up immediately. Gravity also pulls the yo-yo downwards.

    As the yo-yo reaches the end of the string, the angular momentum and gravity cause it to slow down. At this point, the upward pull of the string overcomes the downward pull of gravity, and the yo-yo starts to climb back up the string.

    The cycle then repeats, with the yo-yo going down due to gravity and angular momentum, and then back up due to the string’s upward pull and the decreasing downward momentum. This up and down motion continues as long as the yo-yo is spinning quickly enough to maintain the angular momentum.

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