Physics Flashcards
What is energy stored in the form of chemical bonds called?
Chemical energy
True or False: Energy can be created or destroyed.
False
Fill in the blank: The _____ of energy is the measure of how much useful energy is produced in a process.
efficiency
What is the primary source of energy for the Earth?
The Sun
Which type of energy is associated with the motion of objects?
Kinetic energy
Multiple choice: Which of the following is NOT a form of energy? a) Thermal b) Nuclear c) Gravity d) Light
c) Gravity
What is the unit of energy in the International System of Units (SI)?
Joule
What type of energy is stored in an object due to its position or height?
Potential energy
True or False: A perfectly efficient machine would convert all input energy into useful work.
True
What is the formula for calculating efficiency?
Efficiency = (Useful energy output / Total energy input) x 100%
Fill in the blank: Energy transfer occurs when energy moves from one _____ to another.
system
What is the term for energy that is not useful for doing work, often lost as heat?
Waste energy
Multiple choice: Which of the following is an example of renewable energy? a) Coal b) Natural gas c) Solar d) Nuclear
c) Solar
What phenomenon causes energy to be lost as heat during energy transfers?
Friction
True or False: Mechanical energy is the sum of kinetic and potential energy.
True
Fill in the blank: The _____ principle states that energy cannot be created or destroyed, only transformed.
conservation of energy
What type of energy is associated with the temperature of an object?
Thermal energy
Multiple choice: What is the primary disadvantage of fossil fuels? a) They are renewable b) They produce greenhouse gases c) They are abundant d) They are inexpensive
b) They produce greenhouse gases
What is the process called when plants convert sunlight into chemical energy?
Photosynthesis
True or False: Hydroelectric energy is an example of stored energy.
True
Fill in the blank: In a closed system, the total energy _____ over time.
remains constant
What is the role of batteries in energy storage?
They store chemical energy for later use.
Multiple choice: Which of the following is an example of energy transfer? a) A battery charging b) A light bulb burning out c) A rock at the top of a hill d) A car running
a) A battery charging
What type of energy is released during nuclear reactions?
Nuclear energy
True or False: Energy efficiency can be improved by reducing energy waste.
True
Fill in the blank: The _____ of an energy source refers to its ability to be replenished naturally.
renewability
