NEWTON’S LAWS OF MOTION - University of Houston
[Pages:35]Copyright ? 2010 Pearson Education, Inc.
NEWTON'S LAWS OF MOTION
Chapter 5
Copyright ? 2010 Pearson Education, Inc.
Units of Chapter 5
? Force and mass ? Newton's first law of motion ? Newton's second law of motion ? Newton's third law of motion ? The Vector Nature of Forces: Forces in Two Dimensions ? Weight ? Normal forces
Copyright ? 2010 Pearson Education, Inc.
5-1 Force and mass
? Force: push or pull ? Force is a vector: it has magnitude and direction
5-1 Force and mass
? Mass is the measure of how hard it is to change an objects velocity.
? M a s s c a n a l s o b e thought of as a measure of the quantity of matter in an object.
Copyright ? 2010 Pearson Education, Inc.
Copyright ? 2010 Pearson Education, Inc.
5-2 Newton's first law of motion
? If you stop pushing an object, does it stop moving?
? Only if there is friction! In the absence of any net external force, an object will keep moving at a constant speed in a straight line, or remain at rest.
? This is also known as the law of inertia.
Copyright ? 2010 Pearson Education, Inc.
5-2 Newton's first law of motion
? an object at rest will remain at rest as long as there is no net force acting on it
? an object moving with constant velocity will continue to move with constant velocity (same speed and direction)unless some net force acts on it.
? Law of Inertia:
Fnet = 0 N
a= 0 m/s2
Copyright ? 2010 Pearson Education, Inc.
5-3 Newton's second law of motion
? Two equal weights exert twice the force of one; this can be used for calibration of a spring:
Copyright ? 2010 Pearson Education, Inc.
5-3 Newton's second law of motion
Now that we have a calibrated spring, we can do more experiments. Acceleration is proportional to force:
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