Kinetic Energy
Potential Energy
Forms of Energy
Energy Transformations
General Information from the Unit that is on the Test
Thermal Energy
100
What is the equation to calculate KE?
KE = 1/2 x m x v2
100
What is the equation to calculate PE?
PE = m x g x h
100
Form of energy stored in food, charcoal and batteries
Chemical Energy
100
According to the law of conservation of energy, energy cannot be created or destroyed it can only be ____________.
transformed
100
An object with a moves a distance of 30 meters, and has a force of 300 Newtons. What is the work of the object?
9,000 Joules
100
What is heat transfer using direct contact?
What is conduction?
200
The KE of an object increases as its _____ increases.
a. height
b. velocity
c. gravity
b. velocity
200
Which point has the most PE?
W
200
Form of energy that depends on an object's height
Gravitational potential energy
200
What energy transformation do all three items have in common? (2 answers)
Electrical --> Thermal
200
An object does no work, only if this does not occur.
What is moving; what is displacement?
200
Thermal energy moves from _____ to ______ items.
a. warmer to cooler
b. cooler to warmer
c. warmer to warmer
d. cooler to cooler
a. warmer to cooler
300
Barry Bonds swings a bat which has a mass of 1.5 Kg at a velocity of 55 m/s. Calculate his KE.
Don't forget your units!
KE = 1/2 x m x v2
= 1/2 x 1.5 x 552
= 2268.75 J
300
A toy roller coaster is at the top of a 2 m hill and has a mass of 9.6 grams. Calculate its PE.
Don't forget your units.
PE = m x g x h
= 9.6 x 9.8 x 2
= 188.16 J
300
List two types of energy is present when you bounce a ball?
mechanical, elastic, sound, gravitational
300
You put gas in your car then drive off. What is the energy transformation?
Chemical --> Mechanical/Thermal
300
What are the units of measurement for distance, energy, work, and velocity?
What is meters, joules, joules, and meters/second?
300
Ocean currents are caused by differences in temperature of the air which create density and pressure changes that move water around the globe. What type of heat transfer is this?
convection
400
A golf pro swings his driver which weighs 0.75 kg at a velocity of 60 m/s. Calculate the kinetic energy of the club.
KE = 1/2 x m x v2
= 1/2 x 0.75 x 602
= 1350 J
400
Calculate the PE of a 50 kg diver on the top of a 100 ft diving board.
PE = m x g x h
= 50 x 9.8 x 100
= 49,000 J
400
You eat a slice of pizza, go for a run and sweat it off,
What are the three forms of energy involved?
Chemical, mechanical, thermal
400
Lighting up a firework
Chemical ---> mechanical/sound/light/thermal
400
How is the total energy of a system related to the Law of Conservation of Energy?
What is since energy cannot be created nor destroyed only created, the total energy of a system will stay the same. This is because the energy simply changes forms, and never truly goes away.
400
List one example of radiation WITH AN EXPLANATION.
Anything with feeling heat without direct contact.
500
A 2 kg ball is sitting at the top of a 10m hill. Then it gets pushed at rolls at a velocity of 7m/s. Calculate its KE AND PE.
PE = 2 x 9.8 x 10 = 196 J
KE = 0.5 x 2 x 72 = 49 J
500
When an object is dropped, what happens to its KE and PE?
a. KE and PE increases
b. KE decreases, PE increases
c. KE increases, PE decreases
c. KE increases, PE decreases
500
List 4 forms of energy in this picture WITH A SHORT EXPLANATION.
Light- sun
thermal- sun
mechanical- paddling boat, reeling in fish, fish swimming
chemical- fish is food
sound- from ocean, boat, people talking
500
When you speak into a cell phone and your friend hears your voice, what is the energy transformation?
Sound --> Electromagnetic
500
What is the difference between a renewable and a non-renewable energy source? Give an example of each.
What is renewable does not take a long time to return and can be used again. Non-renewable cannot be remade, and once used, is gone forever. Examples of each would be biomass, solar, hydro, geothermal, nuclear, coal, petroleum, fossil fuels.
500
List one example of convection WITH AN EXPLANATION.
anything of heat transferring through liquids or gases like boiling water, hot air balloon, retro popcorn maker