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Newton’s Law

Newton’s Law. Students Social Perla Hernandez Lisbeth Saldana. Newton’s First Law . Newton's First Law

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Newton’s Law

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  1. Newton’s Law Students Social Perla Hernandez Lisbeth Saldana

  2. Newton’s First Law • Newton's First Law • Isaac Newton (a 17th century scientist) put forth a variety of laws that explain why objects move (or don't move) as they do. These three laws have become known as Newton's three laws of motion. The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. • Newton's first law of motion is often stated as • An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. • There are two parts to this statement - one that predicts the behavior of stationary objects and the other that predicts the behavior of moving objects. The two parts are summarized in the following diagram.

  3. Definition • Defintion:Newton's first law of motion - a body remains at rest or in motion with a constant velocity unless acted upon by an external force. Activity 1:

  4. Newton’s First Law Of Motion • Newton's laws of motion are three physical laws that together laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to said forces. They have been expressed in several different ways over nearly three centuries,[1] and can be summarized as follows: • The three laws of motion were first compiled by Isaac Newton in his Philosophiæ Naturals Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687.[4] Newton used them to explain and investigate the motion of many physical objects and systems.[5] For example, in the third volume of the text, Newton showed that these laws of motion, combined with his law of universal gravitation, explained Kepler's laws of planetary motion.

  5. First Law • There are many more applications of Newton's first law of motion. Several applications are listed below. Perhaps you could think about the law of inertia and provide explanations for each application. • • Blood rushes from your head to your feet while quickly stopping when riding on a descending elevator. • • The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface. • • A brick is painlessly broken over the hand of a physics teacher by slamming it with a hammer. (CAUTION: do not attempt this at home!) • • To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and thrusted downward at high speeds and then abruptly halted. • • Headrests are placed in cars to prevent whiplash injuries during rear-end collisions. • • While riding a skateboard (or wagon or bicycle), you fly forward off the board when hitting a curb or rock or other object that abruptly halts the motion of the skateboard.

  6. Second Law • Second law: The acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass. Thus, F = ma, where F is the net force acting on the object, m is the mass of the object and a is the acceleration of the object.

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