View film and utilized sketches to demonstrate the principle parts of both transverse and longitudinal waves. Identify wave length, amplitude, crest, trough. Derive formula velocity is equal to the product of the wave length and frequency.
We will identify types of trusses. We will look at photos of structures that are built with trusses. Ben will be asked to build a structure (possibly a bridge or tower) that has trusses using basic materials such as toothpicks and glue.
Assignment
none
Session Minutes
45
Minutes Student Attended
45
Lesson Comments
We completed the lesson as written in the lesson outline.
Describe and define parts of a sine curve wave. Indicate the crests, trough, amplitude, and wavelength. Discuss wave frequency in units of Hertz. Determine the period of a wave by definition. Discuss differences in wave speed based on medium. Determine velocity of a wave based on wavelength and frequency. Elicit formula. Sketch and describe transverse waves and longitudinal waves. Discuss both constructive interference and destructive interference.
Introduction to sound and light waves. Discuss waves being formed by vibrations. Show that sound requires a medium which light does not require. Define vibrations. Demonstrate using a pendulum how the length of the pendulum affects the period but not the mass of the pendulum. Define period. Discuss units used in defining frequency, (vibrations/sec and cycles/sed) Relate them both to Hertz units. Eliitc that the period is equivalent to 1/frequency of the wave
Explain satellite motion and forces which act on satellites in circular motion. Discuss horizontal and perpendicular motion which affect satellite movement. Introduce that there is no horizontal component to the force of gravity. Explain the period as a time factor, Discuss why the higher above the Earth, the longer the period for one complete rotation. Introduce elliptical orbits
To observe the effects of gravity on objects in free fall. Lab # 43 conceptual physics lab manual.
Analysts involves explanation of apparent "weightlessness" and examples derived from the lab which demonstrate the ":weightless" effect
We will investigate conservation of momentum in several ways. First in situations involving elastic collisions. Second in collisions involving inelastic collisions. Third in a rollercoaster car as it moves along the ride.
Assignment
none
Session Minutes
45
Minutes Student Attended
45
Lesson Comments
Ben has a clear idea of what conservation of momentum means and how it is applied in a variety of situations.
Discuss satellite motion horizontally and vertically. Define the period or rotation. Demonstrate how the period lengthens as the velocity decreases due to distance from the foci. Discuss elliptical orbits, perigee and apogee, along with kinetic and potential energy conservation.
Outline the path taken by an object when dropped from a height straight up, then with a small horizontal force, then with a larger horizontal force, and finally with a very large force. Note the elliptical path. Determine, using free fall formula, the distance traveled at each pathway in 1 sec. Determine a circular orbit will occur when the velocity is greater than 8000 m/sec. Show that the Earth curves by 5m every 8000 meters. A velocity great enough to overcome gravity and create a satellite, must be at least 8000k/sec.