Warm Up 8/31  Why do we need to document experiments?  List Newton’s 3 Laws of Motion.

Warm Up 9/1  Define Speed  Define Momentum  Define Force  Define Weight

Forces STANDARD 8.P.2A.2 DEVELOP AND USE MODELS TO COMPARE AND PREDICT THE RESULTING EFFECT OF BALANCED AND UNBALANCED FORCES ON AN OBJECT’S MOTION IN TERMS OF MAGNITUDE AND DIRECTION

 Forces are vectors (Magnitude and Direction)  Arrows  Length describing how much force  Arrow Point to show Direction  Using Arrows  The resulting force (Net Force) and direction can be determined  2 types of forces  Balanced Forces  Unbalanced Forces

Balanced Forces  Acting on an object in opposite directions and Equal in strength  Cause no change in speed of an object  ZERO MOVEMENT 10 N10N

Unbalanced Forces  Not Equal  Will cause motion of an object to change speed and direction  2 Unbalanced Forces are exerted in opposite directions, Combined force is equal to the difference of the 2 forces  subtract  Magnitude and Direction of the net force affects the resulting motion

 Combined force is exerted in the direction of the larger force  Unbalanced Forces are exerted in the same direction, Combined force is equal to the sum of the 2 forces  Add the 2 forces

Balanced and Unbalanced Forces  No Net Force, No change of motion  Net Force is equal on both sides, No Movement  Net Force is Unbalanced, Object will move in the direction the greater force is going

Warm Up 9/2  Define Unbalanced Force  Define Balanced Force

RAFT: Forces USE DESCRIPTIVE LANGUAGE  Role: Civil Engineer (Building a skyscraper or highway)  Audience: 8 th Grade Science Class  Format: Letter  Topic: How do Civil Engineers use forces to build  Illustrate a Balanced Force and Unbalanced Force