Science 265

Exam 3 Learning Goals

 

Students will be able to:

·         describe how string instruments change pitch by changing natural frequency

·         describe how instruments use sympathetic vibration or resonance to amplify sound.

·         generalize how an instrument makes music.  All require a source of sound (vibrations), a way to change pitch (changing natural frequencies) and a way to amplify sound (resonance or sympathetic vibration).

 

·         define frequency and amplitude in terms of a sound wave and what we hear.

·         list several different types of waves and identify which need a medium and which do not.

 

 

 

Energy

Students will be able to:

·         Explain why energy does not contain mass

·         Identify the form of energy that an object has depending on its motion or position

·         Compare the amount of potential energy objects have depending on their height and mass.

·         Compare the amount of kinetic energy objects have depending on their speed and mass

·         Identify the energy form before and after a particular event

·         Apply conservation of energy to different events

·         Explain what “The lion eats the sun” means in terms of conservation of energy

·         Predict the final location of an object (pendulum or skater) based on its initial height

·         Explain the behavior of electrically charged objects

·         Explain some differences between magnets and electrical charges.  For example, electric charges are attracted to all metals but magnets are not attracted to all metals, only those that can be magnetized.

·         Describe how induction occurs and which variables increase the induction

·         Describe how a generator produces electricity from a water wheel

·         Describe how a wind turbine produces electricity and trace the energy conversions a step at a time from wind to the motion of electrons

·         Describe the difference between a direct current (DC) and an alternating current (AC)

·         Describe how an AC or DC current is able to light a light bulb or heat a toaster

·         Calculate the horsepower produced by a person based on data from running up a set of stairs.

 

 

Quiz 16                 Blank                     Key

Quiz 18                 Blank                     Key