DO NOW: 10/18/10 Based upon our data collected from our experiment last week, did the weight, or ‘heaviness’ determine how long it would take an object to fall? What does the data tell you? Ball Trial 1 Trial 2 Trial 3 Average: Little 2.83 2.93 2.80 2.85 Vf= (m/s) Big 2.90 2.78 2.84 Vf = (m/s) V=0m/s V=???

This is what your paper should look like… Name Date Class Period Assignment LINEAR MOTION (front) This is what your paper should look like…

LINEAR MOTION (back) SUMMARY: (You will write a 5-7 sentence summary at the end of the notes)

LINEAR MOTION Speed Velocity how fast an object is moving Any units for distance over time are acceptable Velocity

LINEAR MOTION Speed Velocity how fast an object is moving Any units for distance over time are acceptable how fast and in what direction an object is moving Velocity If either speed or direction are changing, velocity will be changing

LINEAR MOTION Speed Velocity how fast an object is moving Any units for distance over time are acceptable how fast and in what direction an object is moving Velocity If either speed or direction are changing, velocity will be changing

LINEAR MOTION Acceleration the rate at which velocity is changing If the objects speed, direction, or both changes, the object changes velocity and accelerates

LINEAR MOTION Acceleration the rate at which velocity is changing If the objects speed, direction, or both changes, the object changes velocity and accelerates The units for acceleration are any combination of units of speed per time

LINEAR MOTION Acceleration the rate at which velocity is changing If the objects speed, direction, or both changes, the object changes velocity and accelerates The units for acceleration are any combination of units of speed per time

LINEAR MOTION Free Fall Freely falling objects are only affected by the influence of gravity The acceleration of an object in free fall is about 10m/s2 Free Fall “g” = acceleration due to gravity = 9.81 m/s2 or ≈ 10 m/s2

LINEAR MOTION Freely falling objects are only affected by the influence of gravity The acceleration of an object in free fall is about 10m/s2 Free Fall “g” = acceleration due to gravity = 9.81 m/s2 or ≈ 10 m/s2 0 sec 1 sec 2 sec 3 sec 4 sec 5 sec 6 sec

LINEAR MOTION Air Resistance Slows down the acceleration of motion In most cases, air resistance is small enough for an object to be considered “falling freely”.