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8. If a car moves with a constant velocity, does it also move with a constant speed?

8. If a car moves with a constant velocity, does it also move with a constant speed?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Please help with questions 8-22! Anything helps!!!
8:14 1 AA A drive.google.com 54 Part One Mechanics 12. What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? (Why do some of your classmates who correctly answer the previous question get this question wrong?) 13. When are you most aware of motion in a moving vehicle-when it is moving steadily in a straight line or when it is accelerating? If a car moved with absolutely constant velocity (no bumps at all), would you be aware of motion? Summary of Formulas distance Speed = time total distance covered Average speed = time interval change of velocity time interval Acceleration change in speed 14. Acceleration is generally defined as the time rate of change of velocity. When can it be defined as the time rate of change of speed? Acceleration (along a straight line) = time interval Velocity acquired in free fall, from rest; v = gt Distance fallen in free fall, from rest; d = 1/2 gr Acceleration on Galileo's Inclined Planes 15. What did Galileo discover about the amount of Review Questions speed a ball gained each second when rolling down an inclined plane? What did this say about the ball's acceleration? Motion Is Relative 1. As you read this, how fast are you moving relative to the chair you are sitting on? Relative to the Sun? 16. What relationship did Galileo discover for the veloc- ity acquired on an incline? 17. What relationship did Galileo discover about a ball's acceleration and the steepness of an incline? What acceleration occurs when the plane is vertical? Speed 2. What two units of measurement are necessary for describing speed? Instantaneous Speed Free Fall 3. What kind of speed is registered by an automobile speedometer-average speed or instantaneous speed? How Fast 18. What exactly is meant by a "freely falling" object? Average Speed 4. Distinguish between instantaneous speed and aver- age speed. 5. What is the average speed in kilometers per hour for a horse that gallops a distance of 15 km in a time of 30 min? 19. What is the gain in speed per second for a freely falling object? 20. What is the velocity acquired by a freely falling object 5 s after being dropped from a rest position? What is the velocity 6 s after? 6. How far does a horse travel if it gallops at an average 21. The acceleration of free fall is about 10 m/s. why speed of 25 km/h for 30 min? does the seconds unit appear twice? 22. When an object is thrown upward, how much speed does it lose each second? Velocity 7. Distinguish between speed and velocity. How Far Constant Velocity 8. If a car moves with a constant velocity, does it also move with a constant speed? 23. What relationship between distance traveled and time did Galileo discover for accelerating objects? 24. What is the distance fallen for a freely falling object 1 s after being dropped from a rest position? What is it 4 s after? Changing Velocity 9. If a car is moving at 90 km/h and it rounds a corner, also at 90 km/h, does it maintain a constant speed? A constant velocity? Defend your answer. 25. What is the effect of air resistance on the accelera- tion of falling objects? What is the acceleration with no air resistance? Acceleration 10. Distinguish between velocity and acceleration. 11. What is the acceleration of a car that increases its velocity from 0 to 100 km/h in 10 s? How Quickly "How Fast" Changes 26. Consider these measurements: 10 m, 10 m/s, and 10 m/s. Which is a measure of distance, which of speed, and which of acceleration?
Transcribed Image Text:8:14 1 AA A drive.google.com 54 Part One Mechanics 12. What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? (Why do some of your classmates who correctly answer the previous question get this question wrong?) 13. When are you most aware of motion in a moving vehicle-when it is moving steadily in a straight line or when it is accelerating? If a car moved with absolutely constant velocity (no bumps at all), would you be aware of motion? Summary of Formulas distance Speed = time total distance covered Average speed = time interval change of velocity time interval Acceleration change in speed 14. Acceleration is generally defined as the time rate of change of velocity. When can it be defined as the time rate of change of speed? Acceleration (along a straight line) = time interval Velocity acquired in free fall, from rest; v = gt Distance fallen in free fall, from rest; d = 1/2 gr Acceleration on Galileo's Inclined Planes 15. What did Galileo discover about the amount of Review Questions speed a ball gained each second when rolling down an inclined plane? What did this say about the ball's acceleration? Motion Is Relative 1. As you read this, how fast are you moving relative to the chair you are sitting on? Relative to the Sun? 16. What relationship did Galileo discover for the veloc- ity acquired on an incline? 17. What relationship did Galileo discover about a ball's acceleration and the steepness of an incline? What acceleration occurs when the plane is vertical? Speed 2. What two units of measurement are necessary for describing speed? Instantaneous Speed Free Fall 3. What kind of speed is registered by an automobile speedometer-average speed or instantaneous speed? How Fast 18. What exactly is meant by a "freely falling" object? Average Speed 4. Distinguish between instantaneous speed and aver- age speed. 5. What is the average speed in kilometers per hour for a horse that gallops a distance of 15 km in a time of 30 min? 19. What is the gain in speed per second for a freely falling object? 20. What is the velocity acquired by a freely falling object 5 s after being dropped from a rest position? What is the velocity 6 s after? 6. How far does a horse travel if it gallops at an average 21. The acceleration of free fall is about 10 m/s. why speed of 25 km/h for 30 min? does the seconds unit appear twice? 22. When an object is thrown upward, how much speed does it lose each second? Velocity 7. Distinguish between speed and velocity. How Far Constant Velocity 8. If a car moves with a constant velocity, does it also move with a constant speed? 23. What relationship between distance traveled and time did Galileo discover for accelerating objects? 24. What is the distance fallen for a freely falling object 1 s after being dropped from a rest position? What is it 4 s after? Changing Velocity 9. If a car is moving at 90 km/h and it rounds a corner, also at 90 km/h, does it maintain a constant speed? A constant velocity? Defend your answer. 25. What is the effect of air resistance on the accelera- tion of falling objects? What is the acceleration with no air resistance? Acceleration 10. Distinguish between velocity and acceleration. 11. What is the acceleration of a car that increases its velocity from 0 to 100 km/h in 10 s? How Quickly "How Fast" Changes 26. Consider these measurements: 10 m, 10 m/s, and 10 m/s. Which is a measure of distance, which of speed, and which of acceleration?
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