1. NEWTON’S LAWS OF MOTION ECQ: How do Newton’s three Laws of Motion affect our everyday life?

2. Newton’s Laws… In 1698, Sir Isaac Newton described relationships between force and motion with three laws. A law is a scientific “rule” that is always true

3. Newton’s FIRST Law of Motion An object at rest remains at rest and an object in motion remains in motion at constant speed in a straight line unless acted on by an unbalanced force. This law is sometimes called the Law of Inertia

4. Inertia Inertia is an object’s tendency to resist motion. Inertia increases with mass.

5. Example: Law #1 A golf ball will remain still until a golfer strikes it.

6. A book sliding along the desk would slide forever if the force of friction didn’t slow it down.

7. Newton’s SECOND Law of Motion The acceleration of an object depends on the mass of the object and the amount of force applied.

8. Example: Law 2 An empty grocery cart is pushed with a force of 20N, a grocery cart full of bricks is pushed with a force of 20N, which will go faster?

9. Newton’s THIRD Law of Motion Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. These are called action/reaction force pairs.

10. Example: Law #3 When the space shuttle launches, thrusters push gases downward as the shuttle lifts upward.

11. Momentum Momentum is a quantity of motion that depends on an object’s mass & velocity. Larger objects that move fast have lots of momentum.

12. The Law of Conservation of Momentum The total momentum of any group of objects remains the same unless outside forces act on the object.

13. SUMMARY Sentence #1: Restate Newton’s First Law in your own words. Sentence #2: Restate Newton’s Second Law in your own words. Sentence #3: Restate Newton’s Third Law in your own words. Sentence #4: Give one real-life example of one of the laws (make sure to tell which law!)