Waves
Waves carry _______ from place to place.
What is energy?
Waves move energy from place to place.
A boy is wearing a red tshirt. The color red is being:
a. refracted
b. reflected
c. absorbed
What is reflected?
The colors we see come from light that is reflected off an object.
Sound waves cannot travel in a _____________.
What is vacuum?
Sound waves need molecules to vibrate in order to make sound. Vacuums are void of molecules, therefore sound waves cannot travel.
Potential energy is highest as the ball reaches it's highest point.
Gravitational potential energy is the highest when objects are further away from the ground.
If you wanted to study the sleep patterns of hummingbirds, what is the best type of scientific investigation to use?
What is a field study?
Field Study- observe plants and animals
Systematic observation - observe naturally occurring events
Controlled experiment- change variables
Model- built if subject cannot be directly studied
A vacuum is __________________.
What is empty space.
A vacuum has no matter.
When a straw is put in a glass of water, it appears to be bent. This is a result of ________________.
What is refraction?
During refraction, light waves pass from one medium to another, making the waves appear bent or magnified.
What are the three energy transformations that occur while listening to a battery powered radio?
chemical (battery) -> electrical -> sound
The stored chemical energy in a battery transforms into electrical energy to power the device. Electrical transforms to sound when the music is heard.
Which scenario is NOT an example of the Law of Conservation of Energy?
a. Using an electrical fan.
b. Eating a salad before track practice.
c. A plant in the sun.
d. A car with a dead battery.
What is D.
The Law of Conservation of Energy states that energy cannot be created or destroyed, only converted from one for to another.
Which is NOT an example of a scientific conclusion?
a. Cereal is better than waffles for breakfast.
b. Plants grew taller with fertilizer.
c. People who exercise sleep longer than people who don't exercise.
What is A?
Conclusions must be based on facts/data, not opinions.
Describe how sound waves move through mediums with different densities.
Solids (fastest) -> liquids ->gasses (slowest)
Sound waves travel fastest through dense materials because the vibrations reach molecules that are close together fastest.
Light waves carry a form of energy called radiant energy. What type of energy is radiant energy?
What is kinetic energy.
Radiant energy is kinetic energy because it is carried by light waves, which move from one place to another.
Sound energy travels fastest through which of the following materials:
salt water
sea water
aluminum
oxygen
What is aluminum?
Sound travels fastest through dense materials.
chemical (battery) -> ________ -> sound (ringing)
What is electrical?
Chemical energy is changed to electrical energy to power devices and machines.
The ______________ is the variable that is measured or observed. The ______________ is the variable that is changed.
What is dependent (outcome) variable and independent (test) variable?
Independent Variable- purposefully changed
Dependent Variable- measured, counted, or recorded
Describe how light waves move through mediums with different densities.
solids (slowest) -> liquids -> gasses -> vacuums (fastest)
Light waves travel fastest through mediums with the least density because molecules don't get in the way.
Which statement is true?
a. When white light is applied to an apple, the color red is absorbed.
b. When white light is applied to an apple, all colors are absorbed.
c. When white light is applied to an apple, all colors are reflected.
d. When white light is applied to an apple, all colors are absorbed, except red.
What is D?
We only see the colors that are reflected, the rest are absorbed.
Sound energy is faster/slower than light energy.
Light waves travel faster than sound waves because light does not need to vibrate through molecules.
Driving a car is an example of changing chemical energy to mechanical energy. Give another real life example of this type of energy transformation.
Answers will vary.
Chemical energy is a form of potential energy. It is stored until it is transferred to another type of energy.
What is the difference between a control group and a constant variable?
Control group receives no independent variable (treatment).
Constant variable remains the same throughout the entire experiment.
How does amplitude relate to the amount of energy a wave carries?
The more energy in a wave, the higher/stronger the amplitude.
Sun passing through a car window is an example of _______________________.
What is transmission?
When light passes through an object instead of being reflected or absorbed, it is called transmission.
Waves with high amplitude carry high __________.
a. pitch
b. energy
c. wavelengths
d. crests
What is energy?
The amplitude indicates how much energy is in a wave. The higher the amplitude, the more energy a wave has.
Which of the following statements is NOT true?
a. The sum of the kinetic and potential energy in a moving object never change.
b. When kinetic energy is at its highest, potential energy is at its lowest.
c. When potential energy is at its highest, kinetic energy is at its lowest.
d. When an object moves, the sum of potential and kinetic energy will change.
What is D?
The sum of the kinetic and potential energy in a moving object never change. (Mechanical energy)
When kinetic energy is at its highest, potential energy is at its lowest.
When potential energy is at its highest, kinetic energy is at its lowest.
Hun E. Suckle wanted to know if bees were more attracted to regular water or sugar water. She put a dish with 100 mL of regular water 5 meters away from a beehive and counted the number of bees that landed on the dish in a 1 hour period. She removed the dish and waited 1 hour for the bees to return to normal activity. Next, she place 100mL of sugar water 5 meters away from the same beehive and recorded the number of bees that landed on the dish for one hour.
Name the: IV, DV, constants, control group and experimental group.
IV: regular water or sugar water
DV: number of bees who visited the bowl
constant: same hive, distance, amount of water, time
control group: dish with regular water
experimental group: dish with sugar water