Energy
Energy's definition
What is the ability to do work?
Potential Energy's definition
What is energy that is stored as a result of portion or shape?
Mechanical energy's definition
What is the sum of an object's potential energy and kinetic energy?
Work's definition
What is the product of a force (applied in the direction of motion of an object) and the distance the object moves.
W=F x D
Input force and Output force definitions
What is:
input force-the force a person exerts on a machine
output force-the force exerted by a machine
Kinetic Energy's definition
What is the energy an object has due to its motion?
What is gravitational potential energy and elastic potential energy?
Chemical Energy's definition
What is the energy stored in the chemical bonds of the molecules that make up a substance?
Unit of work
What is a joule?
Input and output distance definitions
input distance-the distance the input force is applied
Output distance-The distance the output force is exerted through, or how far the load moves
What happens to a ball's kinetic energy when it is thrown at double the speed
What is quadruples?
Example of elastic potential energy
What is any object that springs back to their original shape after being stretched or compressed?
Rubber band, bow string, harp, wind up toys with spring, bouncy balls, etc.
Friction forces cause this change in kinetic energy
What is kinetic energy to be converted into thermal energy?
Power's definition
What is the amount of work done each second
P= W/t
The relationship of the work output of a machine and its work input
What is work output is always less than work input because of friction
The amount of kinetic energy a meteoroid will have when approaching Earth if it has a mass of 120.0 kg and a speed of 20.0 m/s
What is 24,000 Joules?
Three examples of electromagnetic energy waves
What is the sunlight, radio waves, microwaves, infrared radiation, visible light, ultraviolet light, x-rays, and gamma radiation.
When a raindrop falls this is converted
What is gravitational potential energy to kinetic energy?
The amount of work you did if you lift a book from the floor to a bookshelf 2.3 meters above the ground and exert 18.4 N upward force in lifting the book
What is 42.32 J
The other type of simple machine a screw is
What is an inclined plane
The kinetic energy of a ball with a mass of 0.265kg when thrown at a speed of 22 m/s.
What is 64.13 J
The potential energy relative to the ground if a diver is at the top of a 8.0m high diving platform and has a mass of 60.kg
What is 4,704 J
m=60.0g; g=9.8 m/s2; h=8.0m
The Law of conservation of energy states
What is energy cannot be created or destroyed; it can only be converted from one form to another or transferred from one object to another?
The power used if a girl runs up a flight of stairs in 1.8 minutes and the work she has done is equal to 260 J.
What is 2.41 Watts?
The work output of a machine with 80% efficiency
What is 80% of the work put into the machine becomes work output, while 20% is lost to friction