1. Forces Use the force Luke!

2. Forces Difference between mass and weight: Weight is the force you put on the Earth: In the English system we use lbs. In the Metric system we use Newtons. Mass is how much matter you are made up. We use kilograms

3. Force Pressure = Force / Area The bigger the area, the less the pressure, with the same force

4. Force What is the pressure when an object with an area of 100m² is applied with a force of 100N. The unit of this is called a Pascal, or Pa

5. Force Friction is a force that always works against your motion. It decreases velocity. Types of friction: liquids, air resistance, rough floors, etc There are two types of friction: static friction and sliding friction

6. Force Static friction: the force that opposes the start of motion. When the magnitude of your push on the box is greater than the maximum value of static friction, the box moves. Kinetic friction: The force between surfaces of relative motion. This force is less than that of static friction.

7. Force

8. The free-body diagram: This is a way to put all of the forces together on a box to see where the motion is occurring: Important forces to graph: Normal force, Friction force, Weight force, Applied force

9. Force Example pg 99 Then example on pg 126. If you don’t have your chapter 6 packets, grab a book

10. Force Group activity on free body diagrams and the coefficient of friction

11. Force Homework Pg 95 #8, pg 100 #10a,10b, pg 102 #13,16 (use free body diagrams for this one and F=ma) and pg 126 #26 (you must attempt for full credit, +2 Extra Credit points for a correct answer) HW due 10/1/15