FAP0015_Ch02_Kinematics - 08:01 FAP0015 PHYSICS I 1...

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Unformatted text preview: 16/06/11 08:01 FAP0015 PHYSICS I 1 Mechanics can be divided into two parts, kinematics and dynamics . Mechanics Mechanics is the study of motion of objects. Kinematics is the description of the motion of objects without looking at what is causing it. In Dynamics how the motion takes place is explained using the concept of force and energy. Together, kinematics and dynamics form the branch of physics known as Mechanics 16/06/11 08:01 FAP0015 PHYSICS I 2 Ch2: Kinematics in One-Dimension 1. Reference frame and displacement 2. Velocity, average and instantaneous 3. Acceleration 4. Motion at constant acceleration 16/06/11 08:01 FAP0015 PHYSICS I 3 At the end of the lesson, students should be able to: 1.define displacement , velocity (average & instantaneous) and acceleration . 2.derive the equations of motion with constant acceleration. 3.explain the motion of an object based on the given s- t , v- t or a- t , graphs (do graphical analysis ). 4. solve problems using equations of motions. Lesson Outcomes 16/06/11 08:01 FAP0015 PHYSICS I 4 Motion is among the first ever concept to be observed and studied by mankind. Introduction A sound grasp of key principles of mechanics is essential. 16/06/11 08:01 FAP0015 PHYSICS I 5 Reference Frames Reference frame is important when we want to define the relative change of position of an object. A reference point is defined as a point relative to which a position or changed of position is defined. When describing the motion of an object, not only the reference frame and reference point is significant, it is also important to specify the direction of the motion relative to the reference frame or point. 16/06/11 08:01 FAP0015 PHYSICS I 6 If we take Ipoh as a reference point, then Kuala Lumpur is around 205 kilometers south , and Johor Bahru is about 573 kilometers south . J.B. IPOH KL 205 km 573 km A simple example on Reference Frame 16/06/11 08:01 FAP0015 PHYSICS I 7 And, if we take Kuala Lumpur as your reference point then, Johor Bahru is around 368 km south and Ipoh 205 km north . J.B. IPOH 368 km Reference frames must be used when you deal with vector quantities. KL- 205 km 16/06/11 08:01 FAP0015 PHYSICS I 8 Kinematics Definitions Displacement is defined as a change of position ( ∆ x ). ∆ x = x 2 - x 1 x 1 x 2 x Note: Displacement does not depend on the path taken by the object. It only depends on its initial and final position. 16/06/11 08:01 EPF0014 PHYSICS I 9 ∆ x = x 2 - x 1 x 1 x 2 Displacement is defined as a change of position ( ∆ x )....
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FAP0015_Ch02_Kinematics - 08:01 FAP0015 PHYSICS I 1...

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