1. Newton’s First Law of Motion

3. Forces and Dynamics
Force –
Net Force causes change in ________ …..

4. History of Motion
Aristotle in the 4th century BCE believed that the natural state of all objects was at rest … they could not move by themselves

5. Copernicus in the late 15th and early 16th century formulated his theory of the moving Earth.
He created the Heliocentric model of the universe

6. Galileo, argued that only when friction is present is a force needed to keep an object moving.
Galileo stated that the tendency of a moving body to keep moving is natural and that every material object resists changes to its state of motion.

7. Aristotle
384 –322 BCE
Galileo Galilee
1564 – 1642 CE

8. Aristotle
384 –322 BCE
Galileo
1564 – 1642 CE

9. Newton created his three laws of motion in the 1660’s, by the age of 24, and the world hasn’t been the same since
Isaac Newton
1642 – 1727 CE

10. The Inertial Law Newton’s 1st Law-
every object continues in a state of rest, or of uniform speed in a straight line, unless acted on by a nonzero net force.

11. Newton’s 1st Law Objects at rest:
Objects in a state of rest tend to remain at rest
Only a force will change that state.

12. Newton’s 1st Law Objects in motion:
In the absence of forces, a moving object tends to move in a straight line indefinitely
Only a force will change that state.

13. Flip a coin in an airplane, and it behaves as if the plane were at rest. The coin keeps up with you—inertia in action!

14. The Inertial Law
Simply put, things tend to keep on doing what they’re already doing

15. Inertia- an object’s resistance to changes in its motion
Mass is a measure of an objects inertia

18. Unit Conversions
At Earth’s Surface
1 kg = 10 N
1 kg = 2.2 lb