Forms of Energy
Which form of energy does molten metal illustrate?
thermal energy
In a row of dominoes, each close enough to the other so that when one falls, it hits the next and so on... What happens to the kinetic energy of the first domino when it hit the second one?
The kinetic energy transfers from one domino to the next.
The ability to do work (move or change matter)...
Energy
F x d =
Work (W)
potential
Which form of energy does turning on a toaster illustrate?
electrical energy
What type of energy does a compressed pogo stick have?
8.6: Elastic potential energy
Energy due to motion
Kinetic Energy
m x g x h =
Potential Energy (PE)
Energy used to hold the nucleus of an atom together:
Nuclear Energy
Which form of energy does shooting a rubber band illustrate?
mechanical energy
Where does the energy needed to swing a tennis racket come from?
Energy bonds stored in the chemical bonds of the food eaten, which is transferred to the muscles.
Energy that is stored as a result of position or shape...
Potential Energy
W / t =
Power (P)
A ________ ________ is a system in which no additional energy enters or leaves.
Closed system
chemical energy
Two men (w/similar body mass) are standing on the ground next to a building One walks up the steps to the roof of the building. Which man has the greater gravitational potential energy?
8.7: The man on the roof has greater gravitational potential energy
The product of a force (applied in the direction of motion of an object) and the distance the object moves...
Work
1/2 x m x v2 =
Kinetic Energy (KE)
True or False: Machines can change the amount of work that's done.
False. Machines don't change the amount of work that is done but most make work easier by changing the force strength or the distance over which the force is applied.
Which form of energy is illustrated by the vibrations of a beating drum?
sound energy
A book is sitting on a table. The table is exerting an upward force on the book to support it as it rests on the table. Does this force do work? Explain.
The table is not doing work because the object the force is acting on, the book, is not moving.
The amount of work done each second...
Power
Energy cannot be created nor destroyed; it can only be converted from one form to another or transferred from one object to another =
Law of Conservation of Energy
Which two conditions must be met for work to be done?
1. An object must move as a result of the force acting upon it.
2. The acting force must be in the direction of the object's motion.