Evan's Space

  When an object is   oscillating   or   vibrating   in a   wave motion , the   speed of the object varies   along the path. In this video, there are 3 examples of vibrating object. 1) Mass vibrating vertically from a spring 2) Pendulum bob oscillating 3) A particle vibrating up and down on a transverse wave In general, when the object is at the  extreme ends of the oscillation or vibration , it is  momentarily at rest . Hence its  KE  at these points is  minimum or 0 J . And in the  middle  that is where the object is travelling the  fastest , hence the  KE is the maximum .

Instead of imaging how the particles will move and guess their motion, there is a technique which can help you to determine that. In addition, when particles are in phase, it means that both particles on the wave have the same velocity and same displacement. It means both have the same speed in the same direction and same distance and direction away from the rest position. Particles that are out of phase means both are having the same speed but in opposite direction. Refer to the video below to find out more. Question 01: 2005/2008 PP P1 Q20/Q18 Answer: Option D Question 02: 2018 PP P1 Q24 Answer: Option B

Principle of Conservation of Energy states that energy cannot be created or destroyed. It can be converted from one form to another, or transferred from one body to another. The total energy remains constant.

  Revision on Kinematics Refer to the summary given. Video 01: The various physical quantities in kinematics Video 02: Acceleration Video 03: Graphical Analysis of Motion (Displacement (distance)-Time Graph and Velocity (speed)-Time Graph) Video 04: Describing the motion of the car - practice Video 05: Free-fall, acceleration due to gravity Video 06: Motion of 2 objects