The equations of motion describe the motion of an object considering velocity, displacement, and time; each law of motion considers two of these three kinematic variables. The laws consider the variables as follows:
- velocity - time
- displacement - time
- velocity - displacement
It is important to note that these three laws make two fundamental assumptions: that the hypothetical object is moving in a straight line and accelerating at a constant speed (which is rarely, if ever, the case in the universe).
The third law specifically describes the relationship between velocity and displacement, irrespective of time. When acceleration is constant, displacement is proportional to velocity squared (s ∝ v2).
Imagine you are riding a bike at 5mph. By this law, if you double your speed to 10mph, it will take you four times the distance to stop than if you had stopped at 5mph.
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