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# Newton's Laws

Three rules to govern all of classical mechanics.

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Forces act on all objects. Strings and springs apply forces when they are stretched or compressed, rough ground applies friction to steal momentum from moving vehicles, and gravity sculpts the orbits of celestial bodies. Newton's laws are the rules that specify how forces change the motion of an object.

The action of forces on objects alters their subsequent motion. By controlling how and when we apply forces, we can drive cars, steer ships in the ocean, or even fly rockets to the moon.

In these quizzes, we’ll guide you through the process of exploring, deriving, and applying Newton’s laws in practical real-world contexts, such as:

• Hot air balloons

• Drag forces in skydiving

By the end, you’ll have gained both theoretical and intuitive understandings of these fundamental physical laws:

• Newton's first law: an object maintains its state of rest or uniform motion until it is compelled by a net force.
• Newton's second law: the net force acting on an object is related to its change in velocity by $${F_{net}} = m\frac{d\mathbf{v}}{dt}$$.
• Newton's third law: for every action, there is an equal and opposite reaction force and these action-reaction forces act on different objects.
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