Newton’s First Law of Motion

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Presentation transcript:

Newton’s First Law of Motion Unit b - Dynamics Newton’s First Law of Motion

What is Dynamics? Dynamics: is the study of forces, forces provide an explanation for WHY objects move A FORCE: is simply a push or pull Force is a vector quantity; it has both a magnitude and direction Force is measured in NEWTONS (N) Examples of Forces: Gravitational Electric Magnetic Weak and Strong nuclear

Newton’s Laws of Motion NEWTON’S FIRST LAW OF MOTION: “A body continues in its state of rest or uniform motion in a straight line unless acted upon by an external unbalanced (net) force”. The unbalanced (or net force) on an object is the sum of all of the forces acting on the object.

Sample Problems – Net Force A force of 2.0N east and a force of 3.0N east acts on an object. What is the net force on the object? A force of 2.0 N east and a force of 3.0 N west acts on an object. What is the net force on the object? A force of 2.0 N east and a force of 3.0 N south acts on an object. What is the net force on the object?

Illustrations Of Newton’s 1st Law of Motion Holding a bag in your hand as an elevator accelerates upward Standing on a subway that speeds up or slows down A car turns a sharp corner to the left

Inertia and Momentum Newton’s first law is also called the Law of Inertia. Inertia is the tendency of a body to resist changes in motion. The idea of inertia is also called momentum. Momentum varies directly with the mass of the object Momentum varies directly with velocity

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