Show:
Work
Potential and Kinetic Energy
Definitions of Types of Energies
What type of energy?
Potpourri
100
True or False. The definition of work is: A force is applied to an object and the object moves in the opposite direction of the force.
False. To be work, the force and motion must be in the same direction.
100
The ability to do work is called ___________.
energy
100
The energy of moving electrons in wires is called ____________ energy. Is it kinetic or potential?
electrical; kinetic
100
The spinning of fan blades is an example of _________ energy.
mechanical
100
A fan transforms _____________ energy into ___________ energy.
electrical energy thermal, sound, mechanical
200
Force is a ______________ or a ______________.
push or a pull
200
If you are able to do work, you have _____________.
energy
200
The movement of atoms and molecules. This is called ______ energy. Is it kinetic or potential?
thermal; kinetic
200
The energy stored in an apple is an example of _____________ energy.
chemical
200
__________________ is an atom's nucleus breaks apart. This can occur during _______________ energy.
fission/nuclear
300
Is holding weights over your head for 3 hours work?
No, because there is no motion.
300
Energy on an object due to its motion is called _____________ energy.
kinetic
300
Stored energy in food, gasoline, and other substances is called ______________ energy. Is it kinetic or potential?
chemical; potential
300
What type of energy is it when electrons move from nucleus to nucleus in a wire?
electrical
300
_____________ is when two or more atoms join their nuclei. This can occur during _____________energy.
fusion/nuclear
400
Is picking up a bag of groceries work?
Yes, the force and motion are in the same direction.
400
Stored energy is called _______________ energy.
potential
400
Energy that comes from an atom's nucleus is called ________ energy. Is it kinetic or potential?
nuclear; potential
400
When a soccer ball sits at the top of the hill, is it potential or kinetic energy?
potential
400
Why can't a perpetual motion machine work forever?
Energy goes into the machine to start. Part of the output is thermal energy due to friction. Friction stops motion. Eventually, all of the energy will be converted to thermal energy and the machine will stop.
500
Is carrying your backpack on your back and walking work?
No, the force and motion are not in the same direction.
500
Is a ball rolling down a hill is an example of _____________ (kinetic/potential) energy.
kinetic
500
a) This type of energy occurs when an object vibrates, and this caused the air to vibrate. Is it kinetic or potential? b) The energy of photons is called ________ energy. Is it kinetic or potential?
a) sound; kinetic b) light: kinetic
500
Each time that energy is converted to another energy, some of it is converted to ___________ energy. What causes this?
thermal; friction
500
State the Law of Conservation of Energy.
Energy cannot be created or destroyed.