law of conservation and energy Flashcards
(26 cards)
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed from one form to another.
True or False: Kinetic energy is the energy of motion.
True
Fill in the blank: The total energy in a closed system remains ______.
constant
What is potential energy?
Energy stored in an object due to its position or arrangement.
Multiple Choice: Which of the following is a form of kinetic energy? A) Heat B) Chemical C) Gravitational D) Nuclear
A) Heat
What happens to mechanical energy in a frictional system?
Some mechanical energy is transformed into thermal energy due to friction.
True or False: Energy can change forms but the total amount of energy is always the same in a closed system.
True
What is the formula for kinetic energy?
KE = 1/2 mv², where m is mass and v is velocity.
Fill in the blank: When an object falls, its potential energy is converted into ______ energy.
kinetic
Multiple Choice: Which type of energy is associated with the height of an object? A) Kinetic B) Thermal C) Gravitational D) Electrical
C) Gravitational
What is the principle of energy transformation?
Energy can be converted from one form to another but the total energy remains unchanged.
True or False: A pendulum demonstrates the conversion of potential and kinetic energy.
True
What is thermal energy?
The internal energy of an object due to the kinetic energy of its particles.
Fill in the blank: Energy lost in a system due to friction is transformed into ______ energy.
thermal
Multiple Choice: Which of the following is NOT a type of energy? A) Mechanical B) Emotional C) Electrical D) Nuclear
B) Emotional
What is the law of conservation of mass?
Mass cannot be created or destroyed in a closed system.
True or False: The law of conservation applies to both mass and energy.
True
What does the term ‘closed system’ refer to?
A physical system that does not exchange matter with its surroundings.
Fill in the blank: In a closed system, the total ______ remains constant.
energy
Multiple Choice: Which of the following is an example of energy transformation? A) A light bulb converting electrical energy to light B) A rock sitting on a hill C) A book on a shelf D) A stationary car
A) A light bulb converting electrical energy to light
What is mechanical energy?
The sum of potential and kinetic energy in an object.
True or False: Energy can be created from nothing.
False
What is the unit of energy in the International System of Units (SI)?
Joule (J)
Fill in the blank: The process of energy being transferred from one object to another is known as ______.
work
