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Chapter 04a

# Chapter 04a - Chapter 4A The Laws of Motion So far we have...

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Chapter 4A 1 So far we have discussed motion in terms of displacement, velocity, and acceleration. Now we will study the cause of motion. (More specifically, we will study what causes motion to change .) We need to introduce two new concepts first: force mass The Laws of Motion

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Chapter 4A 2 New Concept: Force A force is any pushing or pulling action: Contact forces (pushing a car, kicking a football) Field forces (gravity, magnetic forces) Forces are vectors . We must specify their magnitudes and their directions. We will discuss force units later.
Chapter 4A 3 New Concept: Mass Mass is a measure of the amount of material that an object contains. Mass and weight are not the same. Mass is a scalar quantity - it has no direction. Unit of mass: kilogram (kg)

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Chapter 4A 4 Newton’s First Law An object will remain at rest, or will travel at a constant velocity, unless a net force is acting on it. The net force is the vector sum of all forces acting on the object. No net force no acceleration No acceleration no net force
Chapter 4A 5 Newton’s First Law If no net force is acting on it, a moving object will travel in a straight line, at constant speed, forever.

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Chapter 04a - Chapter 4A The Laws of Motion So far we have...

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