Kinetic Energy
Potential Energy
Work & Simple Machines
Energy Transfer
Heat Transfer
100
Kinetic energy is the energy an object has due to its ______________.
Motion
100
Potential energy is ____________ energy due to an object's ____________.
Potential energy is STORED energy due to an object's POSITION.
100
What are the units of work?
Joules (J)
100
Energy cannot be created or destroyed; it can only be transformed from one form to another. This is called...
The Law of Conservation of Energy
100
Heat energy is a simpler way to say __________ energy.
Thermal
200
The formula to calculate kinetic energy (KE) is...
1/2 x mass x velocity^2
200
The formula to calculate potential energy is...
PE = weight x height
200
What is the formula to calculate work?
Work = Force x Distance
200
This is the energy an object has due to its 1) motion AND 2) position.
Mechanical Energy
200
When we measure ______________, we are actually seeing how fast (or slow) the particles in an object are moving.
Temperature
300
A hummingbird flies to a flower at 5 m/s. If the hummingbird's mass is 2 g, what is its kinetic energy? Include units!
25 J (1/2) x (2) x (5)^2 = (1/2) x 50 = 25
300
Cleo the cat is in a hot air balloon, fulfilling her dream of seeing the world! Cleo and the hot air balloon weigh 125 N together and the balloon is 1000 m off the ground (somewhere over Florida). What is Cleo's potential energy?
125,000 J
300
You are helping Ms. Ellis push her car out of the snow in January because she is not very familiar with snow, being from California. You push with a force of 30 N and she pushed with 30 N but the car does not budge! How much work was applied to the car?
None! In order to have work, the car must move.
300
A skier has a potential energy of 425 J at the top of a slope and a kinetic energy of 790 J toward the bottom. What is the skier's mechanical energy?
1215 J ME = KE + PE ME = 790 + 425 = 1215
300
_________________ is the type of heat transfer that involves direct contact of particles.
Conduction
400
Sharky McSharkerson is swimming really fast to catch Nemo for dinner! If Sharky's mass is 150 kg and he swims at 8 m/s, what is his kinetic energy?
4800 J (1/2) x (150) x (8)^2 = (1/2) x (9600) = 4800
400
You are ready to launch your egg in your device for our egg drop project! Your egg and device weigh 4 N together, and your egg is 10 m off the ground. What is the potential energy of your egg?
40 J
400
A wheelbarrow and a pair of scissors are common examples of what type of simple machine?
Levers
400
Solar panels change sunlight into electricity. This is an example of an energy ______________ from __________ energy into ___________ energy.
transformation; electromagnetic; electrical
400
______________ is when heat particles are transferred through a liquid.
Convection
500
If Nemo stays completely still inside his anemone house, Sharky McSharkerson will swim right past him and not eat him for dinner. If Nemo's mass is 5 g, what is his kinetic energy inside the anemone?
Zero! Nemo is NOT moving.
500
You made Ms. Ellis very proud and decided to become a roller coaster engineer! Your latest design (named after you, of course) weighs 12,000 N and it's highest point is 45 ft high. What is the coaster's potential energy at this point?
540,000 J
500
The six kinds of simple machines do one of the following to make the work easier on you: 1) ___________, 2) ______________ and 3) _____________
1) Increase the force applied 2) Increase the distance over which the force is applied 3) Change the direction
500
You eat a healthy breakfast of cereal and fruit before the FAST Reading test. After trying your hardest on the test, Ms. Ellis plays Four Corners with the class and you get a chance to run around. What is the energy transformation between your breakfast and playing the game?
Healthy Breakfast: Chemical Energy Four Corners: Mechanical Energy (you are running around and changing your position!)
500
You are at summer camp with your friends. You are sitting around a nice warm campfire telling scary stories and roasting marshmallows. What type of heat transfer makes you warm from the fire?
Radiation
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