To investigate the effect of mass on kinetic energy using two balls of the same size dropped into a pool of water, the student should use an experimental method involving the following steps:
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Materials: The student should gather two balls of the same size but different masses. For example, one could be a rubber ball, and another could be a heavier bowling ball (ensuring safety and appropriate sizes).
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Hypothesis: Formulate a hypothesis on how mass will affect kinetic energy. The formula for kinetic energy is \( KE = \frac{1}{2} mv^2 \), where \( m \) is mass and \( v \) is velocity.
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Experimental Setup:
- Use a measuring tool to determine the height from which the balls will be dropped. Ensure that both balls are released from the same height.
- Make sure the pool of water is large enough to minimize splashes and disturbances to the balls’ descent.
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Procedure:
- Drop the first ball from a specified height and observe how it behaves in the water.
- Record observations such as depth of penetration, splash size, and any other measurable effects.
- Repeat the drop with the second ball and observe the same parameters.
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Data Collection: Record the depth of penetration and the size of the splash for both balls after dropping them from the same height.
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Analysis: Analyze the observations to determine if there are noticeable differences in the penetration and splashes caused by balls of different mass.
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Conclusion: Draw conclusions based on the data. Discuss how the mass affected the kinetic energy and the subsequent action in the water.
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Safety Considerations: Ensure safety measures are in place to avoid any accidents during the dropping of the balls.
This method allows for a controlled comparison between balls of different mass while keeping variable factors constant, thereby directly addressing the student's research question.
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