1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 5

2. Overview of Today’s Class Constant acceleration case Acceleration is a function of time: examples

3. If a=a c =Const:

4. Ex. 9 p.35 A dog is chasing a rabbit. The rabbit is 360 meters from his hole running at 15 m/s. The dog is 22 meters behind the rabbit, running at 16 m/s. Does the rabbit make it to the hole?

5. A “police car” problem x=0 x1x1 x2x2 V 3 =20m/s a=0 a p =kt x 2 – x 1 = 3.5 km V 1 =30m/sV 2 =40m/s 1. What was your acceleration before you meet the second police car? 2. How much time did you travel from x 1 to x 2 ? 3. Find x 1 4. At which distance the police car catches you? 5.Convert the velocity from m/s to mph a=const V(t=0)=0

6. Have a great day!