1. Newton’s First and Second Laws of Motion
Chapter 12 Section 2
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2. Aristotle Greek scientist and philosopher
Made many scientific discoveries through Not but not always correct

3. Galileo Italian scientist (1564-1642) Studied about the world and
how gravity produces constant
acceleration.

4. Newton Isaac Newton built on the work of scientists such as Galileo
Published work in a book entitled Principia
Discovered that gravity affects all objects in the universe

5. Newton’s First Law of Motion
1st Law states: The state of motion of an object does not change as long as the net force acting on the object is zero
Sometimes referred to as the law of inertia
Inertia- the tendency of an object to resist a change in its motion

6. Newton’s First Law of Motion

7. Newton’s First Law of Motion

8. Newton’s Second Law of Motion
Acceleration of an object depends upon its mass
Mass- a measure of the inertia of an object and depends on the amount of matter the object contains
Acceleration is directly proportional to the net force acting on it (if force is doubled, the acceleration doubles)

9. Newton’s Second Law of Motion
2nd Law states: the acceleration of an object is equal to the net force acting on it divided by the object’s mass
Doubling the mass cuts acceleration in half
Units: Force is Newton (N) or kg*m/s2
Mass is kg
Acceleration is m/s2

10. Newton’s Second Law of Motion

11. Weight and Mass Weight and Mass are NOT the same
Weight- the force of gravity acting on an object
acceleration due to gravity (9.8 m/s2) acting on it
Same units as force

12. Weight and Mass The weight formula is basically Newton’s 2nd law.
Think about an astronaut on Earth and on the Moon
Weight on Earth will be different than on the moon
Mass on Earth will be the same on the moon