HCI 02 Kinematics Lecture Notes

Hwa Chong Institution (College) H2 Physics C1 2023 1 Chapter 2 Kinematics Mike Powell flying through the air during the long jump finals at the 1992 Olympic Games in Barcelona, Spain. He holds the long jump world record of 8.95 m at the 1991 World Championships in Athletics (Tokyo). (Credits to pinterest.com) “The most important factor for the distance travelled by an object is its velocity at takeoff - both the speed and angle. Elite jumpers usually leave the ground at an angle of twenty degrees or less; therefore, it is more beneficial for a jumper to focus on the speed component of the jump. The greater the speed at takeoff, the longer the trajectory of the centre of mass will be. The importance of a takeoff speed is a factor in the success of sprinters in this event.” (http://en.wikipedia.org/wiki/Long_jump)

Hwa Chong Institution (College) H2 Physics C1 2023 2 TOPIC 2: KINEMATICS H2 Physics Syllabus 9749 Kinematics Learning Outcomes Students should be able to: Rectilinear motion (a) show an understanding of and use the terms distance, displacement, speed, velocity and acceleration. (b) use graphical methods to represent distance, displacement, speed, velocity and acceleration. (c) identify and use the physical quantities from the gradients of displacement-time graphs and areas under and gradients of velocity-time graphs, including cases of non-uniform acceleration. (d) derive, from the definitions of velocity and acceleration, equations which represent uniformly accelerated motion in a straight line. (e) solve problems using equations which represent uniformly accelerated motion in a straight line, including the motion of bodies falling in a uniform gravitational field without air resistance. (f) describe qualitatively the motion of bodies falling in a uniform gravitational field with air resistance. Projectile motion (g) describe and explain motion due to a uniform velocity in one direction and a uniform acceleration in a perpendicular direction. Playlist of lecture examples: https://youtube.com/playlist?list=PL_b5cjrUKDlZwgJjDB24gnT-yvQpEuV3c

Hwa Chong Institution (College) H2 Physics C1 2023 3 Table of Contents 2.0 INTRODUCTION ................................ ................................ ................................ .............................. 5 2.1 TERMINOLOGY ................................ ................................ ................................ ............................... 5 2.1.1 Distance vs. Displacement ................................ ................................ ................................ ................ 5 2.1.2 Speed vs. Velocity ................................ ................................ ................................ ............................ 5 2.1.3 Acceleration ................................ ................................ ................................ .......................