Science💛-Energy Flashcards
(26 cards)
What is energy?
Energy is the ability to do work or cause change.
True or False: Energy can be created or destroyed.
False. Energy cannot be created or destroyed, only transformed.
Fill in the blank: The unit of energy is __________.
Joule
What is kinetic energy?
Kinetic energy is the energy of an object due to its motion.
What is potential energy?
Potential energy is the stored energy of an object due to its position or state.
Calculate the kinetic energy of a 2 kg object moving at 3 m/s. (Use KE = 1/2 mv^2)
The kinetic energy is 9 Joules.
What is the formula for gravitational potential energy?
The formula is PE = mgh (mass x gravity x height).
True or False: The total energy in a closed system remains constant.
True.
What type of energy is associated with the position of an object?
Potential energy.
What type of energy is associated with the motion of an object?
Kinetic energy.
What is the law of conservation of energy?
Energy cannot be created or destroyed, only transformed from one form to another.
Fill in the blank: The energy stored in food is an example of __________ energy.
Chemical
What is thermal energy?
Thermal energy is the total kinetic energy of particles in a substance.
What is the main source of energy for the Earth?
The Sun.
True or False: Energy can only exist in one form at a time.
False. Energy can exist in multiple forms simultaneously.
What is mechanical energy?
Mechanical energy is the sum of kinetic and potential energy in an object.
What type of energy do batteries store?
Chemical energy.
What is the formula to calculate kinetic energy?
KE = 1/2 mv^2.
Fill in the blank: The energy of a stretched or compressed spring is called __________ energy.
Elastic
What does the term ‘energy transfer’ refer to?
The movement of energy from one place or object to another.
What is sound energy?
Sound energy is the energy produced by vibrating sound waves.
What is an example of renewable energy?
Solar energy.
What is an example of non-renewable energy?
Coal.
True or False: All forms of energy can be converted into one another.
True.
