Pre-AP Physics I

Distance, Displacement, Speed, and Velocity Take notes on the following information.  Distance is how far you have traveled along a particular path. It is equivalent to how many steps you take, or how many miles your car actually moves along the road. Distance can be measured in centimeters (cm), meters (m), or kilometers (km). Of course, it can also be measured in miles, but we will only use the metric system in this course.  Displacement is how far you are located away from your starting point. It does not depend on the path that you take between those two points. For instance, Mrs. Statt’s house is 11.3 km from Hastings. But, since she has to drive on roads to get to work, the distance she travels is either 24.1 km or 19.9 km, depending on her route. The displacement is equivalent to the shortcut. Displacement also includes a direction – so on her way to school, Mrs. Statt’s displacement is 11.3 km northwest. On her way home, it is 11.3 km southeast.  Rate is how quickly something changes. For example, speed is the rate at which you cover distance.  Average speed is the distance traveled divided by the time taken to travel that distance. Most speeds in this class will be measured in meters per second (m/s) or kilometers per hour (km/hr). Average speed is NOT the mean of distance traveled d two speeds. As an equation: speed (or magnitude of velocity)  In symbols: v  time to travel t  Instantaneous speed is the speed at an exact instant of time. If an object is traveling at constant speed, the average speed is equal to the instantaneous speed. If the object is changing speeds (starting and stopping, accelerating, …), these two quantities are not equal.  Velocity is speed in a given direction. Sam covers 2 meters every second while walking towards North House – his speed is 2 m/s, and his velocity is 2 m/s, north.

Today is the first problem solving day. Show your work and highlight each answer. Physics I Dist/Disp/Speed/Vel Practice Exercises 1. Nancy walks 20 m west and then 10 m east. What are Nancy’s distance traveled & displacement? 2. Dexter swims 300 m south and then 300 m north. What are Dexter’s distance traveled & displacement? 3. The world speed record on water was set on October 8, 1978 by Ken Warby of Australia. If Ken drove his motorboat a distance of 1000 m in 7.045 s, how fast was his boat moving? 4. Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340 m/s. How deep is the canyon here? 5. It is exactly 10:59, and the bell for physics will ring at exactly 11:00. Suzanne really does not want to be late again. She has to get through 3 hallways: 35.0 m where she can run at 3.50 m/s by dodging teachers, 48.0 m where she can only move at 1.20 m/s since the hall is full of students, and 60.0 m at 5.00 m/s in the empty hallway of the suite. Is she on time or tardy?

Dist/Disp/Speed/Vel Homework Problems 1. When migrating, a flock of geese flies 800 km south the first day. They fly back north 100 km on the second day, and finish on the third day by flying 750 km south. What are the distance and displacement of the geese? 2. During an Apollo moon landing, reflecting panels were placed on the moon so that astronomers could shoot a laser beam from Earth to determine the distance. The reflected laser beam was observed 2.52 s after it was sent. If the speed of light is 3.00x108 m/s, what was the distance between the astronomers and the moon? 3. The Kentucky Derby was won in 2000 by Fusaichi Pegasus in 121 s. If the race is 2011 m, what was his speed? 4. Two physics professors challenge each other to a race across a 100 m long field. The loser will grade the winner’s lab papers for one month. Dr. Nelson runs the race in 10.40 s. Dr. Bray runs the first 25 m at an average speed of 10 m/s, the next 50 m at 9.5 m/s, and the last 25.0 m at 11 m/s. Who gets stuck grading labs? 5. Linda is riding in a train that is moving east at a constant rate of 30 m/s. All of the following should be answered relative to the ground a. If Linda is sitting still, how far does she move in 2.0 sec? b. If Linda is walking towards the front of the train at 2.0 m/s, how far does she move in 2.0 sec? c. If Linda is walking towards the back of the train at 2.0 m/s, how far does she move in 2.0 sec?

Physics I Dist/Disp/Speed/Vel Practice Exercises 1. Nancy walks 20 m west and then 10 m east. What are Nancy’s distance traveled & displacement? 2. Dexter swims 300 m south and then 300 m north. What are Dexter’s distance traveled & displacement? 3. The world speed record on water was set on October 8, 1978 by Ken Warby of Australia. If Ken drove his motorboat a distance of 1000 m in 7.045 s, how fast was his boat moving? 4. Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340 m/s. How deep is the canyon here? 5. It is exactly 10:59, and the bell for physics will ring at exactly 11:00. Suzanne really does not want to be late again. She has to get through 3 hallways: 35.0 m where she can run at 3.50 m/s by dodging teachers, 48.0 m where she can only move at 1.20 m/s since the hall is full of students, and 60.0 m at 5.00 m/s in the empty hallway of the suite. Is she on time or tardy?

Dist/Disp/Speed/Vel Homework Problems 1. When migrating, a flock of geese flies 800 km south the first day. They fly back north 100 km on the second day, and finish on the third day by flying 750 km south. What are the distance and displacement of the geese? 2. During an Apollo moon landing, reflecting panels were placed on the moon so that astronomers could shoot a laser beam from Earth to determine the distance. The reflected laser beam was observed 2.52 s after it was sent. If the speed of light is 3.00x108 m/s, what was the distance between the astronomers and the moon? 3. The Kentucky Derby was won in 2000 by Fusaichi Pegasus in 121 s. If the race is 2011 m, what was his speed? 4. Two physics professors challenge each other to a race across a 100 m long field. The loser will grade the winner’s lab papers for one month. Dr. Nelson runs the race in 10.40 s. Dr. Bray runs the first 25 m at an average speed of 10 m/s, the next 50 m at 9.5 m/s, and the last 25.0 m at 11 m/s. Who gets stuck grading labs? 5. Linda is riding in a train that is moving east at a constant rate of 30 m/s. All of the following should be answered relative to the ground a. If Linda is sitting still, how far does she move in 2.0 sec? b. If Linda is walking towards the front of the train at 2.0 m/s, how far does she move in 2.0 sec? c. If Linda is walking towards the back of the train at 2.0 m/s, how far does she move in 2.0 sec? Pre-AP Physics I Dist/Disp/Speed/Vel Practice Exercises 1. Nancy walks 20 m west and then 10 m east. What are Nancy’s distance traveled & displacement? 2. Dexter swims 300 m south and then 300 m north. What are Dexter’s distance traveled & displacement? 3. The world speed record on water was set on October 8, 1978 by Ken Warby of Australia. If Ken drove his motorboat a distance of 1000 m in 7.045 s, how fast was his boat moving? 4. Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340 m/s. How deep is the canyon here? 5. Suzanne has exactly 1 minute to get to physics. She has to get through 3 hallways: 35.0 m where she can run at 3.50 m/s by dodging teachers, 48.0 m where she can only move at 1.20 m/s since the hall is full of students, and 60.0 m at 5.00 m/s in the empty hallway of the suite. Is she on time or tardy again? 6. A submarine fires a torpedo. It travels through the water at 20.0 m/s and explodes on a target 2000 m away. If the sound of the explosion is heard 101.4 s after the torpedo was fired, what is the speed of sound in water?

Dist/Disp/Speed/Vel Homework Problems 1. When migrating, a flock of geese flies 800 km south the first day. They fly back north 100 km on the second day, and finish on the third day by flying 750 km south. What are the distance and displacement of the geese? 2. During an Apollo moon landing, reflecting panels were placed on the moon so that astronomers could shoot a laser beam from Earth to determine the distance. The reflected laser beam was observed 2.52 s after it was sent. If the speed of light is 3.00x108 m/s, what was the distance between the astronomers and the moon? 3. The Kentucky Derby was won in 2000 by Fusaichi Pegasus in 121 s. If the race is 2011 m, what was his speed? 4. Two physics professors challenge each other to a race across a 100 m long field. The loser will grade the winner’s lab papers for one month. Dr. Nelson runs the race in 10.40 s. Dr. Bray runs the first 25 m at an average speed of 10 m/s, the next 50 m at 9.5 m/s, and the last 25.0 m at 11 m/s. Who gets stuck grading labs? 5. Linda is riding in a train that is moving east at a constant rate of 30 m/s. A) If Linda is sitting still, how far does she move in 2.0 sec? B) If Linda is walking towards the front of the train at 2.0 m/s, how far does she move in 2.0 sec? C) If Linda is walking towards the back of the train at 2.0 m/s, how far does she move in 2.0 sec? 6. Seth is traveling down the interstate at a speed of 9.0 m/s. Mack is driving his big-rig truck at 27.0 m/s when he notices Seth 30.0 m ahead of him. How far does Mack travel before he catches up to Seth?

Pre-AP Physics I Dist/Disp/Speed/Vel Practice Exercises 1. Nancy walks 20 m west and then 10 m east. What are Nancy’s distance traveled & displacement? 2. Dexter swims 300 m south and then 300 m north. What are Dexter’s distance traveled & displacement? 3. The world speed record on water was set on October 8, 1978 by Ken Warby of Australia. If Ken drove his motorboat a distance of 1000 m in 7.045 s, how fast was his boat moving? 4. Hans stands at the rim of the Grand Canyon and yodels down to the bottom. He hears his yodel echo back from the canyon floor 5.20 s later. Assume that the speed of sound in air is 340 m/s. How deep is the canyon here? 5. Suzanne has exactly 1 minute to get to physics. She has to get through 3 hallways: 35.0 m where she can run at 3.50 m/s by dodging teachers, 48.0 m where she can only move at 1.20 m/s since the hall is full of students, and 60.0 m at 5.00 m/s in the empty hallway of the suite. Is she on time or tardy again? 6. A submarine fires a torpedo. It travels through the water at 20.0 m/s and explodes on a target 2000 m away. If the sound of the explosion is heard 101.4 s after the torpedo was fired, what is the speed of sound in water?

Dist/Disp/Speed/Vel Homework Problems 1. When migrating, a flock of geese flies 800 km south the first day. They fly back north 100 km on the second day, and finish on the third day by flying 750 km south. What are the distance and displacement of the geese? 2. During an Apollo moon landing, reflecting panels were placed on the moon so that astronomers could shoot a laser beam from Earth to determine the distance. The reflected laser beam was observed 2.52 s after it was sent. If the speed of light is 3.00x108 m/s, what was the distance between the astronomers and the moon? 3. The Kentucky Derby was won in 2000 by Fusaichi Pegasus in 121 s. If the race is 2011 m, what was his speed? 4. Two physics professors challenge each other to a race across a 100 m long field. The loser will grade the winner’s lab papers for one month. Dr. Nelson runs the race in 10.40 s. Dr. Bray runs the first 25 m at an average speed of 10 m/s, the next 50 m at 9.5 m/s, and the last 25.0 m at 11 m/s. Who gets stuck grading labs? 5. Linda is riding in a train that is moving east at a constant rate of 30 m/s. A) If Linda is sitting still, how far does she move in 2.0 sec? B) If Linda is walking towards the front of the train at 2.0 m/s, how far does she move in 2.0 sec? C) If Linda is walking towards the back of the train at 2.0 m/s, how far does she move in 2.0 sec? 6. Seth is traveling down the interstate at a speed of 9.0 m/s. Mack is driving his big-rig truck at 27.0 m/s when he notices Seth 30.0 m ahead of him. How far does Mack travel before he catches up to Seth?