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Newtons First Law of Motion. Krishna Gopal Shrivestava of India set an unofficial world record in 1999 by pulling a ship with a mass of 244,000 kg with.

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Presentation on theme: "Newtons First Law of Motion. Krishna Gopal Shrivestava of India set an unofficial world record in 1999 by pulling a ship with a mass of 244,000 kg with."— Presentation transcript:

1 Newtons First Law of Motion

2 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.

3 Famous Scientists The Laws of Motion Great ideas on motion!

4 Section 1: The First Law of Motion Objectives: Define Newtons first law of motion. Explain how inertia and mass are related.

5 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!!

6 Aristotle (300 B.C.) Greece (cont.) Aristotles ideas about motion were a beginning in scientific thought.

7 Galileo Galilei (1600s) 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

8 Galileo Galilei (cont.) Galileos 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

9 Sir Isaac Newton (1700s) 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

10 Newtons 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

11 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.

12 Newtons 1st Law of Motion Apply Newtons 1 st Law of motion to this picture:

13 Newtons 1st Law of Motio n Sports 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)


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