CHAPTER 3 ACCELERATED MOTION
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1 Physics Approximate Timeline Students are expected to keep up with class work when absent. CHAPTER 3 ACCELERATED MOTION Day Plans for the day Assignments for the day Acceleration o Changing Velocity Assignments 3.0 & 3.1 Read section(s) 3.2 o Average & Instantaneous Acceleration o + & - Acceleration o Determining Acceleration from a V-T Graph Motion with Constant Acceleration o Velocity with Average Acceleration Assignment 3.2 Read section(s) 3.3 o Position with Constant Acceleration Free Fall Assignment 3.3 o Acceleration Due to Gravity 4 Review for Chapter 3 Test 5 Chapter 3 Test Read section(s) 4.1
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3 Study Guide Chapter 3 Quizzes Quiz 3.1 Acceleration 1. Define the term "acceleration". 2. How is acceleration found on a velocity-time graph? 3. What does it mean when we say an object is experiencing negative acceleration? 4. Think of a velocity-time graph. a. The slope of the line is equal to? b. The area under the curve is equal to? c. A straight line means? d. A line that curves upward means? e. A line that curves upward means? 5. Solve an acceleration problem. Quiz 3.2 Motion with Constant Acceleration 6. Define acceleration. 7. Know how to find acceleration on a velocity-time graph. 8. Know what is meant by the term negative acceleration. 9. Solve acceleration problems. Quiz 3.3 Free Fall 10. Know the value of the acceleration due to gravity. 11. Know the symbol given to the acceleration due to gravity. 12. Solve problems involving an object in free fall.
4 Study Guide Chapter 3 Test At the completion of chapter 3 you should 1. Know the definitions of the following terms. a. Average Acceleration b. Instantaneous Acceleration c. Free Fall d. Acceleration Due to Gravity 2. Be able to determine average acceleration. 3. Understand what is meant by negative acceleration. 4. Plot a Velocity-Time graph. 5. Determine acceleration from a Velocity-Time graph. 6. Determine displacement from a Velocity-Time graph. 7. Solve all types of acceleration problems. 8. Know the value of the acceleration due to gravity. 9. Solve free fall problems.
5 Assignment 3.0 Vocabulary Define each of the following terms. 1. Acceleration 2. Average Acceleration 3. Instantaneous Acceleration 4. Free Fall 5. Acceleration Due to Gravity
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7 Assignment 3.1 Acceleration Short Answer: Answer each question in the space provided. Write or print clearly. IF I CAN T READ IT IT S WRONG. 1. How are velocity and acceleration related? 2. Give an example of each of the following. A) An object that is slowing down, but has a positive acceleration. B) An object that is speeding up, but has a negative acceleration. C) What does the slope of the tangent to the curve on a velocity-time graph measure? 3. Does a car that is slowing down always have a negative acceleration? Explain. 4. If an object has zero acceleration, does it mean its velocity is zero? Give an example. Problems: Solve each of the following problems. Show all work. Circle your answer expressed with the correct number of significant figures and units. 5. A car is driven for 2.0 h at 40.0 km/h, then for another 2.0 h at 60.0 km/h in the same direction. A) What is the car s average velocity? B) What is the car s average velocity if it is driven 1.00 x 10 2 km at each of the two speeds?
8 6. Find the uniform acceleration that causes a car s velocity to change from 32 m/s to 96 m/s in an 8.0 s period. 7. A car with velocity of 22 m/s is accelerated uniformly at the rate of 1.6 m/s 2 for 6.8 s. What is its final velocity? 8. Refer to the figure to the right to find the acceleration of the moving object at each of the following times. A) during the first 5.0 s of travel B) between 5.0 s and 10.0 s C) between 10.0 s and 15.0 s D) between 20.0 s and 25.0 s
9 Assignment 3.2 Motion with Constant Acceleration Short Answer: Answer each question in the space provided. Write or print clearly. IF I CAN T READ IT IT S WRONG. 1. Consider a car traveling on a straight stretch of interstate highway. No entrance/exit ramps are available. A) Can the car have a negative velocity and a positive acceleration at the same time? Explain. B) Can the car s velocity change signs while it is traveling with constant acceleration? Explain. 2. Can the velocity of an object change when its acceleration is constant? If so, give an example. If not, explain. 3. If an object s velocity-time graph is a straight line parallel to the t-axis, what can you conclude about the object s acceleration? 4. If you were given a table of velocities of an object at various times, how would you find out whether the acceleration was constant? Problems: Solve each of the following problems. Show all work. Circle your answer expressed with the correct number of significant figures and units. 5. A dragster starting from rest accelerates at 49 m/s 2. How fast is it going when it has traveled 325 m?
10 6. A car moves at 12 m/s and coasts up a hill with uniform acceleration of -1.6 m/s 2. A) What is its displacement after 6.0 s? B) What is its displacement after 9.0 s? 7. A car traveling 20.0 m/s when the driver sees a child standing on the road. She takes 0.80 s to react, then steps on the brakes and slows at 7.0 m/s 2. How far does the car go before it stops? 8. How far does a plane fly in 15 s while its velocity is changing from 145 /s to 75 m/s at a uniform rate of acceleration?
11 Assignment 3.3 Free Fall Short Answer: Answer each question in the space provided. Write or print clearly. IF I CAN T READ IT IT S WRONG. 1. Give some examples of falling objects for which air resistance cannot be ignored. 2. Give some examples of falling objects for which air resistance can be ignored. 3. An object shot straight up rises for 7.0 s before it reaches its maximum height. A second object falling from rest takes 7.0 s to reach the ground. Compare the displacements of the two objects during this time interval. 4. The value of g on the Moon is one sixth of it value on Earth. A) Would a fall that is dropped by an astronaut hit the surface of the Moon with a greater, equal or lesser speed that that of a ball dropped from the same height to Earth? B) Would it take the ball more, less, or equal time to fall? 5. Rock A is dropped from a cliff and rock B is thrown upward from the same position. A) When they reach the ground at the bottom of the cliff, which rock has a greater velocity? B) Which has a greater acceleration? C) Which arrives first?
12 Problems: Solve each of the following problems. Show all work. Circle your answer expressed with the correct number of significant figures and units. 6. Suppose an astronaut drops a feather from 1.2 m above the surface of the Moon. If the acceleration due to gravity on the Moon is 1.62 m/s 2 downward, how long does it take the feather to hit the Moon s surface? 7. A stone that starts from rest is in freefall for 8.0 s. A) Calculate the stone s velocity after 8.0 s. B) What is the stone s displacement during this time? 8. A bag is dropped from a hovering helicopter and falls for 2.0 s. A) What is the bag s velocity? B) How far has the bag fallen?
13 9. You throw a ball downward from a window at a speed of 2.0 m/s. How fast will it be moving when it hits the sidewalk 2.5 m below? 10. If you throw the ball in the previous problem up instead of down, how fast will it be moving when it hits the sidewalk?
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