Linear motion is a topic in physics that studies the precise description of motion without regard to causes. It examines concepts like distance, displacement, speed, velocity, and acceleration. Solving linear motion problems involves defining variables, converting units, and using the appropriate kinematic equations and algebraic and trigonometric skills to calculate unknown values and check answers. Graphs of distance-time, velocity-time, and acceleration-time relationships can also help analyze linear motion.

1. Linear Motion

2. Science and Physics Science Knowledge as of facts, phenomenon, laws and proximate causes gained and verified by exact observation, organized experiment and correct thinking. Physics The science that treats of matter and energy susceptible to precise observation, experimental control, and exact measurement.

3. Problem Solving in Physics Read the problem Make a sketch Assign variables and symbols Convert units Determine the definitions, laws and relationships Use equations and your knowledge of algebra and trigonometry to solve for unknown Check your answers

4. Terms: Kinematics The study of the precise description of motion, regardless of causes. Dynamics The study of nature of causes of changes is motion Distance The total length of travel without regard to direction or changes in direction Displacement The directed distance between two points in space. Speed The rate at which body is changing its distance along its path Velocity The time rate at which body is changing its displacement Acceleration The time rate of change of velocity

5. Average Velocity and Average Speed

6. Sample Problem 1:

7. Instantaneous Velocity and Speed

8. Sample Problem 2:

9. Solution:

10. Average Acceleration

11. Instantaneous Acceleration

12. Graphical Relationship between x, v and a Distance – time diagram Velocity – time diagram Acceleration – time diagram

13. Sample Problem 2:

14. Seatwork: 1. 2. 3.

15. Assignment: 1. 2.

16. Questions:

17. Reference: Physics for Scientists and Engineers with modern Physics 7 th Edition by Jewett/Serway © 2008 Thompson Learning Inc.