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Thread: Reflection - reaction force direction

  1. #1 Reflection - reaction force direction 
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    Let's say object hits a wall. When the object is reflected does the direction of the reaction force caused on the wall looks like the red arrow ? Does that direction depends on how "strong" object is reflected?


    (http) i.imgur.com/StTDgso.png


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  3. #2  
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    The reaction force is always opposite in direction to the acting force. Anything else would result in an acting force increase, which even if very small would violate the Law of Energy Conservation, and make perpetual motion possible.


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  4. #3  
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    If friction is ignored, it's in the direction of the red arrow. If there is a frictional force there would be a horizontal component of the reaction force.

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  5. #4  
    Forum Bachelors Degree GoldenRatio's Avatar
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    An easy experiment to test this is with pennies. Set up a small barricade like a ruler turned on its side with pennies lined behind it. Hold the ruler tight & slam a penny in from the other side on whatever angle you like. See which pennies move

    (simplified test, harold is correct but if you want to experiment for yourself....)
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    Universal Mind John Galt's Avatar
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    Does this assume an inelastic collision?
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