newtons first law of motion. krishna gopal shrivestava of india set an unofficial world record in...
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Newton’s First Law of Motion
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• Krishna Gopal Shrivestava of India set an unofficial world record in 1999 by pulling a ship with a mass of 244,000 kg with his teeth. We can use this feat to learn about force, mass, and acceleration.
1. How would a small rowboat be different if Shrivestava pulled it rather than a large ship?
2. In what direction did the ship move? Why do you think so?
3. When Shrivestava stopped pulling, did the ship stop moving? Explain.
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Famous ScientistsThe Laws of Motion
Great ideas on motion!
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Section 1: The First Law of Motion
Objectives:• Define Newton’s first law of motion.• Explain how inertia and mass are related.
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Aristotle (300 B.C.) Greece
• His ideas were popular for ~2,000 years.
• Now, his ideas are obsolete.
• 2,000 years of false knowledge
What Aristotle said:
• Heavier objects fall faster than lighter ones
• Earth is the center of the universe
• All motion on Earth is straight and linear
WRONG!!
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Aristotle (300 B.C.) Greece (cont.)
Aristotle’s ideas about motion were a beginning in scientific thought.
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Galileo Galilei (1600’s) Italy• Discovered moons of Jupiter• Supported the idea that planets revolve around the
Sun• Famous for ideas on motion…but these were not
readily accepted in his time
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Galileo Galilei (cont.)
Galileo’s Ideas on Motion:
1. All objects fall at same speed (independent of weight)
2. Introduced concept of friction- which slows things down
3. Inertia (sluggish or lazy)- tendency of an object to resist a change in its motion
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Sir Isaac Newton (1700’s) England
• “Father of Physics”– Devised calculus– Explained gravity, the
universal law of gravitation (apple on head?)
– Formulated a theory on the nature of light
– Formulated the laws of motion
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Newton’s 1st Law of Motion
• An object at rest remains at rest…• An object in motion maintains its velocity…• Net force = 0– balanced forces, no acceleration!
Unless it experiences an
unbalanced force
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First Law (cont.): INERTIA
• Newton borrowed the idea from Galileo.• The inertia of an object is the tendency of the
object to resist a change in motion.• The larger the mass of an object, the greater
its inertia.
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Newton’s 1st Law of Motion
Apply Newton’s 1st Law of motion to this picture:
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Newton’s 1st Law of MotionSports Examples:• A moving ball will keep
moving forever. Unless slowed by external
force of friction (ground, floor) or gravity
• A soccer ball in grass remains stationary. Until it is kicked (external
unbalanced force)