Sound and Light
What is wavelength?
The length of a wave from one trough or crest to the next
What is the unit for force?
Newtons (N)
What kind of variables does an experiment include?
- Independent Variables
- Dependent Variables
- Control Groups
What is kinetic energy?
Energy that is in motion
Calculate the net force
90 N -><- 40 N
50 N ->
What is amplitude?
The height of a wave from it's center line
What is the formula to calculate distance?
Speed x Time
What is a control group?
A group that is used as the standard (they are not exposed to the variable)
If a roller-coaster is at the top of it's highest hill, which force is greater? (PE vs. KE)
The potential energy
True or False:
EM waves do not move at a set speed
FALSE
EM waves move at 300,000,000 m/s
Sound waves do not move at a set speed
What is the unit of measurement for frequency?
Hertz (Hz)
What is speed?
The time taken to travel a distance
Define what independent and dependent variables are
Answers may vary
What is thermal energy?
Kinetic energy that is transfered into heat
What is the law of conservation of energy?
Energy can not be created or destroyed, only transferred
How fast does light travel?
300,000,000 m/s
What is the symbol for force?
f
True or False:
A variable is the part of the experiment that does not change
FALSE
If a soccer ball is at 73% of its maximum kinetic energy, what percentage is its potential energy at?
27%
What is a period?
The time taken for one wave to be completed
If a wave's wavelength increases, will it's frequency increase, decrease, or stay the same?
Calculate the force if a car is 80 kg and moving at a speed of 40 m/h
3200 N
Mark is conducting an experiment on what kind of flour attracts the most maggots. He puts six different kinds of flour in a maggot-infested cupboard and waits a week before taking them out. He performs daily progress checks on the flour. What are his independent and dependent variables?
Independent: Kind of flour
Dependent: Amount of maggots
List three kinds of potential energy
Sarah is conducting an experiment to investigate how differently sourced water affects plant growth. She has five plants and water from six different sources. Make a control group and an independent and dependent variable for her experiment.
Answers may vary