Name: Date:

Period:

Guided Reading: Motion

Start on page 10, §2.1 “Motion is Relative” and answer the following questions as you read: 1. What does it mean to say that motion is relative?

2. A book at rest, relative to the table it lies on, is moving at about __________________ relative to the sun. 3. The book moves __________________ relative to the center of our galaxy. 4. Unless stated otherwise, when we discuss the speeds of things in our environment, we mean speed with respect to ___________________________. Continue to page 11, §2.2 “Speed” and answer the following questions as you read: 1. Define Speed:

2. What is the equation for Speed?

3. Look at Figure 2.1, a cheetah can achieve peak speeds of _____________. 4. Throughout this book (and this class!) we’ll primarily use the units _____________________ for speed. 5. Look at Table 2.1, and fill in the following blanks:

80 km/h =

____ mi/h = ____ m/s

___ km/h =

62 mi/h

=

28 m/s

6. Define Instantaneous Speed:

7. Look at Figure 2.2, what two readings of instantaneous speed does a speedometer give? ______________________ and 8. Define Average Speed:

9. What is the equation for Average Speed?

10. Average speed does not do what? 11. Whether we talk about average speed or instantaneous speed, we are talking about the _________________________________________________.

Continue to page 13, §2.3 “Velocity” and answer the following questions as you read: 1. Define Velocity:

2. How does speed differ from velocity?

3. Look at Figure 2.3, how is the velocity changing every second if the speed is constant?

4. Motion at constant velocity is motion in a _________________ at ____________________. 5. What three controls in a car can change its velocity? 1. 2. 3. Start on page 15, §2.4 “Acceleration” and answer the following questions as you read: 1. Define Acceleration:

2. What is the equation for acceleration? a. In words:

b. In equation form:

3. The key idea that defines acceleration is ____________. Whenever we change our state of motion we are . 4. Look at Figure 2.4, what does the author say in the caption?

5. Does the term acceleration apply to objects that are only speeding up, only slowly down, or both? ________________________. 6. Negative acceleration is also called 7. Acceleration applies to change in

. as well as changes in

.

8. When you round a turn, is it possible to accelerate even if you have a constant speed? Why or why not?

9. What are the units of acceleration? ____________________ or ↑We’ll fill in this one in class!