Chapter 4 Notes

# Chapter 4 Notes - Newton's first law of motion or law of...

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Newton's first law of motion or law of inertia states that an object continues in a state of rest or in a state of motion at a constant speed along a straight line unless compelled to change that state by a net force . Inertia is the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line. The mass of a body is a quantitative measure of inertia and is measured in an SI unit called the kilogram (kg). An inertial reference frame is one in which Newton's law of inertia is valid. Newton's second law of motion states that when a net force F acts on an object of mass m , the acceleration a of the object is given by F = m a . The SI unit of force is the newton (N). When determining the net force, a free-body diagram is helpful. A free- body diagram is a diagram that represents the object and the forces acting on it. Newton's third law of motion, often called the action–reaction law , states that whenever one object exerts a force on a second object, the second object exerts an

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## This note was uploaded on 04/09/2008 for the course PHYS 101 taught by Professor Sharp during the Spring '08 term at Ohio State.

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Chapter 4 Notes - Newton's first law of motion or law of...

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