Plans for the Week and Assignments:

1. FRIDAY(08/28): Introduction to Ch.2 - Representing Motion.

HW: Read pages 30-51. Solve prob.#49, 50, 51, 52, & 53 on page 53.

2. MONDAY(08/31): Graphically analyzing the motion of an object.

HW: Solve prob.#60 on page 54.

3. TUESDAY(09/01): LAB experiment on Measuring Time.

HW: Process Lab data.

4. WEDNESDAY(09/02): Post-Lab Discussion and Calculations.

HW: Complete lab report and write Abstract (due Friday).

5. THURSDAY(09/03): Introduction to Ch.3 - Accelerated Motion.

HW: Read pages 56-79. Solve prob.#79 & 80 on page 81, and #88,

89, 98, & 99 on page 82.

6. FRIDAY(09/04): Solving all types of Straight-Line Motion

Problems. HW: Solve prob.#103, 105, 106 & 107 on pages 82 & 83.

7. TUESDAY(09/08): REVIEW for Test on Ch.2 & 3 and checking

all homework assignments. HW: Complete Review Handout and Study

for Test.

8. WEDNESDAY(09/09): TEST on Ch.2 & 3- Study of Straight-Line Motion.

HW: Go to web site for notes on Ch.4 - Forces in One Dimension.

WEBSITE NOTES: Ch.2 & 3- The Study of Motion in a Straight Line.

1. In Physics, the study of motion is known as Mechanics. This is divided

into Kinematics, the study of HOW things move, and Dynamics, which is

concerned with WHY they move.

2. Galileo (1564-1642) was the first to study motion and developed

Kinematics. He performed his experiments Pisa, Italy, frequently dropping

objects from the Leaning Tower and/or rolling spheres along level surfaces

and down ramps.

3. Galileo's study of motion produced five motion formulas:

(I) Δd = v_avg·t , with Δd = d_f - d_i , (II) v_avg= (v_i + v_f)/2 , (III) v_f = v_i + a·t ,

(IV) v_f² = v_i² + 2a·Δd , and (V) Δd = v_i·t + ½at² .

4. Isaac Newton (1642-1727) derived Dynamics and basically figured-out

why objects move. He was a theoretical physicist. From his work we get

the 3 Laws of Motion and the Law of Universal Gravitation, which he

explained using an apple.

5. We will study the work of Newton, in depth, after a few more chapters.

6. If an object starts from rest, then v_i = 0 . If an object comes to a stop,

then v_f = 0. For an object moving with constant velocity, a = 0 .

7. Displacement, velocity, and acceleration are directed quantities. For

example, the upward direction is positive and the downward direction is

negative. To the East, positive , but to the West, negative. In other

words, opposite directions have the opposite sign of the original direction.

8. Displacement, velocity, and acceleration can all be demonstrated

graphically. For example, straight lines on a position-time graph indicate

constant velocity, determined by the slope.

9. The area under a velocity-time graph is displacement while the slope

of the graph indicates acceleration. The area under an acceleration-time

graph is the velocity.

10. The acceleration due to gravity is g = -9.81 m/s² for Earth at sea level.

This is known as free-fall acceleration and is the same for all objects

regardless of mass near the surface of the Earth.

11. To solve a motion problem in Physics use these steps:

(i) read the problem and identify the given variables

(ii) determine what you are asked to solve for

(iii) find the correct motion formula to use

(iv) use algebra to isolate the unknown

(v) substitute-in the given information and simplify.