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Inertia. When an object is in motion it tends to stay in motion. When an object is at rest it tends to stay at rest. An example is if you are in a car going 50mph. You would also be going 50 mph. That is why you should wear a seatbelt on a vehicle, because when the car stops you need something to stop you.

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11y ago
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9y ago

The first law applies in this case. The car and its contents are moving at a constant rate and everything is fine. When suddenly the brake is applied, since the human is not tied to the seat with nuts and bolts, it tends to keep moving forward at the same speed that the car was travelling before the brake was applied. Since it is rather unwise to tie the human to the seat with nuts and bolts, the next best thing would be to provide a restraining agent to minimize the forward motion of the body and yet give him freedom of movement to operate the vehicle. The buttocks of the driver are a bit more rigidly fixed to the seat (relatively speaking) than the upper torso. The whole body continue to move at the speed at which the car was travelling before the brake was applied, but the upper torso moves forward farther and faster. The shoulder belt tries to minimize this speed lest the driver hit the steering column. The lap belt provides the same function to the lower portion of the body.

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7y ago

An object in motion (you, in the moving car) tends to STAY in motion. When the car stops abruptly, you will not- and will hit the inside of the car- if you did not wear your seatbelt.

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10y ago

Newton's first law, which is also known as the law of inertia.

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13y ago

the 2nd law of motion

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13y ago

#1

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7y ago

Inertia.

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Q: Which of Newton's laws explains why we need to wear seat belts?
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