1. 1.What does Net Force mean? 2.What is Newton’s 1 st Law? The Questions

2. Force changes motion A force is a push or pull BUT IT IS THE “NET FORCE” THAT WE CARE ABOUT!!

3. Net Force  Net Force is the sum of the forces acting on an object in EACH direction (x or y).  What is the Net Force acting on the golf ball??  x-Direction: (+20N) + (-10N) = +10N  y-Direction: (+5N) + (-5N) = 0N -10N +20N -5N +5N Gravity

4. (+300N) + (+300N) = +600N (+Normal Up) + (-Gravity down) = 0N Is this object in Equilibrium?

5. Newton’s 1 st Law: The Law of Inertia  Official Version: “An object at rest will stay at rest and an object in motion will continue in motion at a CONSTANT VELOCITY unless acted on by a NON-0 Net force.”

6. Newton’s 1 st Law: The Law of Inertia

7.  Inertia is a property of matter!  Who said this??  Billy Nye  Inertia is the property of an object that resists changes in motion (VELOCITY).  Inertia = mass  Inertia is the same thing as an objects mass.  Inertia is measured with kilograms. Which ball has more inertia? Newton’s 1 st Law: The Law of Inertia Bowling Ball

8. 1.What does Net Force mean? a)The sum of all of the forces acting on an object. 2.What is Newton’s 1 st Law? a)Known as the “Law of Inertia” b)An object’s velocity will change if the net force is not 0. The Answers

9. Newton’s First Law is known as: 1.Law of Action and Reaction 2.Law of Conserved Mass 3.Law of Inertia 4.Law of Conserved Energy 5.Law of the Benevolent Dictator

10. Inertia is measured in units of 1.Meters 2.Liters 3.Kilograms 4.Seconds 5.N/kg 6.m/s 2

11. What has more Inertia? 1.Baseball 2.Skyball 3.Bowling Ball 4.Beach Ball 5.Golf Ball 6.Ping Pong Ball

12. A Net Force of +100N acts on an object. That object will 1.Stay in motion. 2.Stay at rest. 3.Have its velocity changed.