Energy Flashcards
Energy is the…
ability to do work
What energy is known as the energy of moving objects
kinetic energy
What energy is known as stored energy
potential energy
energy is measured in…
joules
Thermal energy occurs when…
the movement of atoms becomes faster resulting in higher temperature.
A piece of bread getting toasted is an example of…
energy transfer
A ball starts at the top of the hill meaning it has…
only potential energy
As the ball rolls down the hill the ball has…
both potential and kinetic energy
Once the ball is at the bottom of the hill but still rolling it has…
kinetic energy only
Once the ball stops rolling it has…
neither potential nor kinetic energy
How would you calculate kinetic energy?
1/2 or 0.5 times mass times velocity /speed squared.
How would you calculate potential energy?
mass multiplied by gravitational force times height.
How would you calculate height with given potential/kinetic energy and weight?
take the total potential energy and set it equal to the weight times the force of gravity then once you multiply those two values- divide it by potential energy.
The potential energy of a 40-kg cannon ball is 14000 J. How high was the cannon ball to have this much potential energy?
35.7m
You are on roller blades on top of a small hill. Your potential energy is equal to 1,000.0 joules. The last time you checked your mass was 60.0 kilograms.
588 N
How many Newtons are in each kilogram?
9.8
How would you find how many newtons are in each kilogram for an equation?
multiply the value of kilos by 9.8
(point A, a ball rolling down the hill)
(point B, the ball has reached the bottom of the hill but is still rolling)
What transfer is happening between point A and point B
Kinetic and potential energy to purely kinetic energy
When does an object reach maximum kinetic energy?
When in the middle of the pendulum, drop etc.
The law of conservation of energy states that…
energy cannot be created or destroyed only changed from one state to another.
A flashlight uses batteries transforms what type of energy into light energy?
chemical
when we eat food we take in —– energy that is changed into —–and —– energy as we move.
chemical
kinetic/mechanical, thermal
An electric fan takes electricity and transforms it into what type of energy?
kinetic.
What is mechanical energy? think abt what a hydraulic press does
Energy that is stored in objects by the application of a force.
How would you calculate mechanical energy?
potential energy + kinetic energy (E=u+k)
What is chemical energy?
Energy that is stored in the bonds of molecules and atoms. This is potential energy.
What is nuclear energy (NUCLE)?
Energy that is STORED in the nucleus of an atom. this holds the nucleus together.
What is gravitational energy?
think of an apple in a tree far above the ground.
The energy stored in an object due to its height above the earth.
How would you calculate gravitational energy? (visualize the definition)
weight multiplied by height.
A rubber band being stretched is an example of…
elastic energy
How would you calculate for elastic energy?
1/2 multiplied by spring constant times displacement squared.
Electrical energy is caused by the…
rapid movement of electrons.
Radiant/light energy is defined as…
electromagnetic energy that travels in transverse waves.
Thermal energy is defined as…
the internal energy in substances or heat ––that vibration and movement of the atoms and molecules within an object cause.
The motion of energy is defined as…
the movement of objects from one place to another.
Sound energy is defined as..
the movement of energy through pressure waves.
