Recent content by george ozua

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    What are the coefficients of friction between various surfaces and concrete?

    Hello, Does anyone know the value of the coefficients of friction between the following surfaces? (I've searched all over internet and literature but cannot find them :( ) 1) Aluminium on concrete. 2) Steel on concrete. 3) Iron on concrete. Thanks a lot!
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    Calculating the initial speed of an object that decelerates in a ramp.

    Homework Statement Hello, An object moves at constant speed in a horizontal surface. Suddenly, a ramp comes along its way. The object starts to climb such ramp. Due to this, the object starts to lose speed. At certain distance, the object loses all of its speed. I want to calculate the value...
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    Discussion regarding the frames of reference

    A person is inside a car. This person is not using the seat belt. The car crashes with a solid wall and decelerates quickly. The person, due to inertia, keeps moving until stopped by the wind shield. I want to analyze the movement of this person after the crash, but I am troubled...
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    Why do passengers in a car that stops abruptly experience different speeds?

    Two cars move at a speed of 16 meters per second. Each of them has a passenger that is not wearing the seat-belt. Both of these cars decelerate abruptly. Car number one completely stops in 0.25 seconds. Car number two completely stops in two seconds. We know that in both cases, the passengers...
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