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Assumption College English Program
Mr. Stephen Dobosh’s
E P - M 4 P h y s i c s C l a s s w o r k / H o m e w o r k P a c k e t
Chapter 2: Motion in One Dimension
Section 1: Displacement and Velocity
Section 2: Acceleration
Section 3: Falling Objects
Student’s Name ……………………..…………………..…… EP-M …./…. ID #………….. Register #……
Chapter 2: Motion in One Dimension Classwork/Homework Packet
Mr. Stephen Dobosh Page 8 of 32
Questions? Come see Mr. Steve or email him with a picture of your work at [email protected].
Chapter 2.2: Acceleration (pp. 44-55)
Practice B, p. 45 #1-5
Due: _________________
1. As the shuttle bus comes to a sudden stop to avoid hitting a dog, it accelerates uniformly at −4.1 m/s2 as it slows from 9.0 m/s to 0.0 m/s. Find the time interval of acceleration for the bus.
2. A car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s2 to reach a speed of 12.0 m/s.
How long does it take for this acceleration to occur?
3. With an average acceleration of −1.2 m/s2, how long will it take a cyclist to bring a bicycle
with an initial speed of 6.5 m/s to a complete stop?
4. Turner’s treadmill runs with a velocity of −1.2 m/s and speeds up at regular intervals during
a half-hour workout. After 25 min, the treadmill has a velocity of −6.5 m/s. What is the average acceleration of the treadmill during this period?
5. Suppose a treadmill has an average acceleration of 4.7 × 10−3 m/s2.
a. How much does its speed change after 5.0 min?
b. If the treadmill’s initial speed is 1.7 m/s, what will its final speed be?
Chapter 2: Motion in One Dimension Classwork/Homework Packet
Mr. Stephen Dobosh Page 10 of 32
Questions? Come see Mr. Steve or email him with a picture of your work at [email protected].
Chapter 2.2: Acceleration (pp. 44-55)
Practice D, p. 51 #1-4
Due: _________________
Note: Each question has two parts! So you need to have two answers for each!
1. A car with an initial speed of 6.5 m/s accelerates at a uniform rate of 0.92 m/s2 for 3.6 s. Find
the final speed and the displacement of the car during this time.
2. An automobile with an initial speed of 4.30 m/s accelerates uniformly at the rate of 3.00
m/s2. Find the final speed and the displacement after 5.00 s.
3. A car starts from rest and travels for 5.0 s with a constant acceleration of −1.5 m/s2.What is
the final velocity of the car? How far does the car travel in this time interval?
4. A driver of a car traveling at 15.0 m/s applies the brakes, causing a uniform acceleration of −2.0 m/s2. How long does it take the car to accelerate to a final speed of 10.0 m/s? How far has the car moved during the braking period?
Chapter 2: Motion in One Dimension Classwork/Homework Packet
Mr. Stephen Dobosh Page 13 of 32
Questions? Come see Mr. Steve or email him with a picture of your work at [email protected].
Chapter 2.2: Acceleration (pp. 44-55)
Formative Assessment 2.2, p. 55 #1-6
Due: _________________
1. Marissa’s car accelerates uniformly at a rate of +2.60 m/s2. How long does it take for
Marissa’s car to accelerate from a speed of 24.6 m/s to a speed of 26.8 m/s?
2. A bowling ball with a negative initial velocity slows down as it rolls down the lane toward the
pins. Is the bowling ball’s acceleration positive or negative as it rolls toward the pins?
3. Nathan accelerates his skateboard uniformly along a straight path from rest to 12.5 m/s in
2.5 s. a. What is Nathan’s acceleration?
b. What is Nathan’s displacement during this time interval?
c. What is Nathan’s average velocity during this time interval?
4. Critical Thinking Two cars are moving in the same direction in parallel lanes along a highway.
At some instant, the instantaneous velocity of car A exceeds the instantaneous velocity of car B. Does this mean that car A’s acceleration is greater than car B’s? Explain, and use examples.
Chapter 2: Motion in One Dimension Classwork/Homework Packet
Mr. Stephen Dobosh Page 16 of 32
Questions? Come see Mr. Steve or email him with a picture of your work at [email protected].
Chapter 2.3: Falling Objects (pp. 56-61)
Formative Assessment 2.3, p. 61 #1-6
Due: _________________
1. A coin is tossed vertically upward. a. What happens to its velocity while it is in the air?
b. Does its acceleration increase, decrease, or remain constant while it is in the air?
2. A pebble is dropped down a well and hits the water 1.5 s later. Using the equations for
motion with constant acceleration, determine the distance from the edge of the well to the water’s surface.
3. A ball is thrown vertically upward. What are its velocity and acceleration when it reaches its
maximum altitude? What is its acceleration just before it hits the ground?
4. Two children are bouncing small rubber balls. One child simply drops a ball. At the same
time, the second child throws a ball downward so that it has an initial speed of 10 m/s. What is the acceleration of each ball while in motion?
5. Critical Thinking A gymnast practices two dismounts from the high bar on the uneven
parallel bars. During one dismount, she swings up off the bar with an initial upward velocity of + 4.0 m/s. In the second, she releases from the same height but with an initial downward velocity of −3.0 m/s. What is her acceleration in each case? How do the final velocities of the gymnast as she reaches the ground differ?
Chapter 2: Motion in One Dimension Classwork/Homework Packet
Mr. Stephen Dobosh Page 17 of 32
Questions? Come see Mr. Steve or email him with a picture of your work at [email protected].
6. Interpreting Graphics Figure 3.4 (2009 ed., Figure 17) is a position-time graph of the motion of a basketball thrown straight up. Use the graph to sketch the path of the basketball and to sketch a velocity-time graph of the basketball’s motion.
a. Is the velocity of the basketball constant? (If so, estimate the acceleration.)
b. Is the acceleration of the basketball constant? (If so, estimate the acceleration.)
c. What is the initial velocity of the basketball?
3. Suppose now that our skater was observed in a third trial. The following data were obtained:
a. Plot the position vs. time graph for the skater using the graph provided above.
b. What do you think is happening during the time interval: t = 4 s to t = 6 s? How do
you know?
c. What do you think is happening during the time interval: t = 6 s to t = 10 s? How do
you know?
d. Determine the skater's average velocity from t = 0 s to t = 16 s. (Average velocity is the displacement (final position minus initial position) divided by time elapsed.)
e. Determine the skater's average speed from t = 0 s to t = 16 s. (Average speed is the distance traveled along the path (change in odometer reading) divided by time elapsed.)
f. List some example situations in which average speed is a better measure of motion than average velocity.
g. List some example situations in which average velocity is a better measure of motion
(Questions 5-7) Draw the velocity vs time graphs for an object whose motion produced the position vs time graphs shown below at left. (The first one has been done for you.)
8. For many graphs, both the slope of the line and the area between the line and the horizontal axis (a.k.a. the “area under the curve”) have physical meanings.
a. What does the slope of a position-time graph tell you about the motion of an object?
b. Looking at the velocity-time graphs, determine the units for a square of area on the graph.
c. What quantity does the area under the velocity-time graph tell you about the motion of an object?