Lesson 1
An object is not moving but could move because of its position. Which category of energy does it have?
Potential Energy
Heat moves naturally in which direction between two objects?
From Warmer to Cooler
Sound cannot travel in outer space because there is no ______.
Medium
A drum is hit harder and the sound becomes louder. Which property of the wave increased?
Amplitude
Energy stored in batteries and food is this type.
Chemical Energy
When you eat food and then run, chemical energy changes into this form.
Mechanical (Kinetic) Energy
Two objects have the same temperature, but one is much larger. Which has more thermal energy?
The larger object
Sound waves move particles back and forth in the same direction as the wave. This type of wave is called ______.
Longitudinal Wave
Power lines sag on hot days because increased thermal energy causes this change in matter.
Objects, when heated, expand
Thunder is evidence that sound energy traveled through this medium.
Air
A light bulb changes electrical energy mainly into these two forms.
Light (Electromagnetic/Radiant) and Thermal Energy
A metal lid stuck on a jar becomes easier to open after hot water is poured on it because the lid does this.
Objects, when heated expands
The part of a sound wave where particles are closest together and pressure is highest.
Compression
A siren sounds higher as it approaches you. This apparent change in frequency is called ______.
Doppler Effect
When a roller coaster reaches the bottom of a hill, most of its energy is in this form.
Kinetic Energy
A stretched bow has elastic potential energy. When the arrow is released, that energy becomes this.
Kinetic energy of the arrow
If a thermometer is placed in hot water, alcohol rises because the particles do these two things.
Move faster and spread farther apart
If the frequency of a sound increases, what happens to the pitch?
The pitch becomes higher
Why does a cold spoon become warm when placed in hot soup?
Heat flows from the soup to the spoon
Which would transfer heat to your hand faster: metal or wood?
Metal
Even though energy changes forms many times, the total amount never changes because of this scientific law.
Law of Conservation of Energy
How does Ice float on water?
Water expands when it freezes
A trumpet player shortens the air column to change the sound. This mainly changes which property of the wave?
Frequency (and Pitch)
Explain why tightening a guitar string produces a higher pitch
Tighter strings vibrate faster, increasing frequency
If two sounds have equal amplitude but different frequencies, which property will sound different to your ear?
Pitch