Forms of Energy
Energy Transformations
Kinetic and Potential Energy
Heat Transfer and Specific Heat
Heating and Cooling Graphs
Questions
Questions
100
What is stored energy? Also, known as the energy an object has based on its position.
Potential Energy
100
According to the law of conservation of energy, the total amount of energy in a system will do what?
stay the same (stay constant)
100
The sum of kinetic energy and potential energy within a system is called ___________________ energy.
Mechanical Energy
100
Molecules of two solid substances actually collide with each other to transfer energy in this method of heat transfer.
Conduction
100
What letter indicates the point where the substance starts melting?
P
200
What type of energy does an object have when it is in motion?
Kinetic Energy
200
List the energy transformation that occurs in a light bulb that is on.
Electrical-->radiant
200
A softball is hit high into the air as shown in the picture above. As it rises, how does the kinetic energy and potential energy change?
Potential energy increases as kinetic energy decreases.
200
Chef Tom works in a very busy restaurant. He cooks for 100's of people each night. Which type of pot would Chef Tom want to use, copper or aluminum?
Copper specific heat: 0.385 J/gC
Aluminum specific heat: 0.9 J/gC
Copper
200
The heating curve of an ice-water mixture that is slowly heated to 125°C contains three sloped and two level portions. What do the three sloped portions in the graph represent?
states of matter that the water is in
300
What type of energy is produced from the movement of tiny particles called electrons?
Electricity
300
Photovoltaic energy is the conversion of _________ energy into electricity through a photovoltaic cell.
light (radiant)
300
A box slides from the top of a ramp to the bottom. Where is its maximum potential energy located?
At the top of the ramp.
300
What type of heat transfer is used to fry an egg in a pan and how can you tell?
Conduction: The egg is getting heated up and cooking because of its direct contact with the pan.
300
When a substance loses heat and cools down, is this an endothermic or exothermic change?
exothermic
400
What type of energy is produced by the kinetic energy (movement) of molecules in a substance?
Thermal Energy
400
Wind turbines can generate a great deal of electricity. The kinetic energy of the blades of a windmill helps produce electricity. 100% of the kinetic energy is not always transformed to electricity. What is the most likely source of "wasted" energy?
Thermal energy (heat)
400
A car with a mass of 1500 kg is moving at a rate of 4 ms. Determine its kinetic energy.
12,000J
400
Conduction occurs more easily between solids and liquids. Why does conduction not occur very easily in gases?
Particles in gas are far apart
400
As temperature of this substance rises from 20°C to 50°C, the substance _______ heat and its kinetic energy _________.
absorbs (gains); increases
500
What type of energy is produced when a nuclear reaction takes place?
Nuclear Energy
500
An icepack contains ammonium nitrate. When this is dissolved in water it gets considerably colder. This is an example of heat energy being converted into _______________energy.
Chemical Energy
500
A 400.0 kg storage box is held 10 m above ground by a forklift. What is its gravitational potential energy? (PE = mgh)
39,200 J
500
What method of heat transfer is being depicted by the picture above?
Convection
500
Liquid water first appears after how many minutes?
3