Falling and walking Related concepts: Newton\'s 1^st law, gravitation You will n
ID: 1652752 • Letter: F
Question
Falling and walking Related concepts: Newton's 1^st law, gravitation You will need: a marble or something else small and round, a paper or styrofoam cup or some other cup you don't care about, paper towel Description: The purpose of this experiment is to show how Newton's 1^st law applies to falling objects. Activity: Put a bit of crumpled paper towel into the cup for padding. While standing still, hold the marble up at eye level, and the cup at waist level directly below the marble. Drop the marble into the cup a few times for practice while standing still. When you are confident in your marble-dropping ability, walk forward in a straight line at a constant speed. Your task is to drop the marble into the cup while you are walking forward. Where should you hold the marble --- directly over the cup, or ...? Practice so you can drop the ball into the cup while walking briskly forward. Do not change your forward speed until after the marble has landed in the cup.Explanation / Answer
The marble should be held directly over the cup. When we drop the marble while walking forward , it follows a parabolic path and always remains over the cup. There will be a vertical acceleration in the marble and if we ignore the air resistance, it would have a constant horizontal velocity, equal to our walking speed. So it will always appears to be directly above the cup during its course of motion. The horizontal motion of the marble is due to its own inertia. When dropped from the height it already possesss a horizontal motion. Since there is no horizontal force acting on the marble it will maintain its state of horizontal motion., i.e., Newton's law of Inertia.
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