IV & DV
This variable is what is measured
dependent variable
What are the 2 types of energy?
Kinetic and Potential
kinetic energy
Distance is to speed as power is to _______
work
This variable is what is changed
What type of energy is stored energy?
potential energy
The more mass an object has, the more ________
the more total E.
Work is measured in what unit?
Joules (J)
These are the units for power
J/s
w (lowercase!)
In the popsicle stick lab, what were the independent and dependent variables?
IV: Fulcrum height
DC: Distance cotton ball traveled
Ms. Kahloan eats a banana for breakfast, this is an example of what type of energy?
chemical energy
Nuclear
Ms. Kahloan moves a table 2.5 meters that has a force of 50 N, how much work did she put in?
50 x 2.5 = 125 J
A dog produces 500 J of work when running to catch a ball in 45 seconds. How much power is produced?
P = W/t
P= 500 J/45 s
P= 11.1 J/s or 11.1 w
In the powerful 8th grader lab, what were the independent and dependent variables?
IV: Sets of stairs/# of stairs/ flights of stairs
DV: Amount of power
Ms. Kahloan is running on the treadmill while listening to music, this includes what 2 types of energy?
motion and sound
Where is the most KE on a graph? Where is the least?
Most= lowest point, least= highest post
The groundhog digs a hole 0.005 kilometers wide with a force of 20 N, how much work did it do?
0.005 km = 5 m
20(5)= 100 J
In 2 minutes, the microwave uses 1000 J of energy, what is the wattage (power) produced?
P= W/t
P= 1000 J/120 s
P= 8.3 J/s or 8.3 w
In the rubber band lab, what were the independent and dependent variables?
IV: Stretch of rubber band
DV: Distance cup moved
You and a group of friends are on a roller coaster, what energies are produced during the entire roller coaster ride?
Where is the most PE on a graph? Where is the least?
Most= highest point, least= lowest point
A construction worker produces 350 J/s of power while building a 2 meter fence in 6 hours. How much work did they do? (This will be a big number!)
6 hrs = 21, 6000 s
P= W/t
350 J/s (21,6000 s) = W
7,560,000 J= W
When sprinting for 30 seconds, an individual produces 30 J/s worth of power. How much work did the individual produce?
P= W/t
30 J/s = W/30
30 s (30 J/s) = W
900 J = W