Imagine you are riding in a car traveling at a constant velocity holding an open glass of water. The driver stops suddenly and the water sloshes over the glass. Which direction will the water spill from the glass? How can you explain the spill using Newton’s first law of motion?
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Answer:
imagine you are riding in car traveling constant velocity holding an open glass of water the driver stops suddenly and the water
When you apply a force to the glass, the glass begins accelerating. The water in the glass isn't directly experiencing this force, and so doesn't accelerate forward - it therefore appears to move backwards.
Since the wall of the glass is solid, normal forces keep the water within the glass, eventually accelerating the water with the glass.
When the glass comes to a stop, the opposite effect happens - no force is directly acting on the water, so it wants to continue moving with its initial velocity. As a result, it sloshes forward into the now-stationary glass wall.
Newton’s First Law of Motion: Newton’s First Law of Motion asserts that an object maintains its state of rest or motion unless or until an external force acts upon it. It is also known as the law of inertia. In 1687, Mathematician and Physicist Sir Issac Newton discovered the First Law of Motion. The laws of motion are described in one of his books, Philosophize Naturalis Principia Mathematica, also known as the Principia.
Newton formulated these laws of motion based on Galileo’s experiment. For example, a momentary jerk is felt by passengers sitting inside a bus when the driver abruptly applies the breaks. This can be attributed to the law of inertia. As a result of the law of inertia, our body maintains a state of motion even after the bus stops, thereby pushing us in the forward direction.
According to Newton's first law of motion, a push or a pull that either changes or tends to change the state of rest or uniform motion (constant velocity) of a body is known as a force. An external force is a force originating from outside an object rather than a force internal to an object.
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