Download presentation

1
PHYS16 – Lecture 32 Ch. 15 Oscillations

2
**Oscillations pre-question**

Is a bouncing ball an example of simple harmonic motion? Yes No

3
**Oscillations pre-question**

Two kids are swinging on two swings of the same height – one kid is a little chubbier than the other. Neglecting frictional forces, which kid completes a back and forth swing in the fastest time? A) The chubby kid B) The skinny kid C) The kid who pushes off the ground the best D) Both complete in the same time

4
**Outline for Oscillations**

Simple Harmonic Motion Position, Velocity, Acceleration Force Energy Resonance and Damping

5
**Oscillations and Periodic Motion**

Simple Harmonic Motion 1) About Equil. 2) Periodic 3) Sinusoidal

6
**Discussion: Examples of SHM?**

Mass on a Spring Pendulum Snowboarder in halfpipe Bungee jumper Child on swing Bobble head doll?

7
**Simple Harmonic Motion: Position, Velocity, Acceleration**

8
**Simple Harmonic Motion**

Equilibrium Point

9
Discussion: Phase Your book says that displacement is in terms of cosine and I just said that it is in terms of sine? Who is right? There is also a phase term (φ) that let’s you set the initial condition. If the oscillation starts at A it is a sine with a φ=90 degrees or a cosine with a φ=0 degrees.

10
**SHM Position, Velocity, Acceleration**

11
**Discussion What is the max speed and when does it occur?**

Equilibrium Point

12
Example Question An object undergoes simple harmonic motion. If the amplitude and period are doubled, the object’s max speed is: Quadrupled Doubled Unchanged Halved Quartered

13
**Simple Harmonic Motion: Restoring Force**

14
Restoring Force Force that always points back to the equilibrium position – Example = spring k is just a constant – for a spring it is the spring constant

15
**Restoring Force – Spring**

16
Discussion: Period A block on a spring has a period of T. What is the period if: the mass is doubled? k is quadrupled? A is doubled?

17
**Restoring Force - Pendulum**

What is the period of a pendulum?

18
**Simple Harmonic Motion: Energy**

19
Energy in SHM

20
**Main Points - SHM Movement Restoring Force creates oscillation**

Energy is dependent on amplitude

Similar presentations

OK

SIMPLE HARMONIC MOTION AND SPRINGS. SIMPLE HARMONIC MOTION Starts from a stable point or a rest point When an object is disturbed, it has a restorative.

SIMPLE HARMONIC MOTION AND SPRINGS. SIMPLE HARMONIC MOTION Starts from a stable point or a rest point When an object is disturbed, it has a restorative.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on light travels in a straight line Ppt on high level languages for computers Jit ppt on manufacturing definition Ppt on ebola virus infections Ppt on chapter 3 atoms and molecules elements Ppt on video library management system Ppt on polynomials of 9 Ppt on soft skills development Download ppt on turbo generator aircraft Ppt on nepali culture and people