J
Joule
Metric unit used to measure work and energy; can also be used to measure heat; equivalent to newton-meter.
K
Kelvin
The kelvin is the SI Unit of absolute temperature. 273.15 K is the same as 0 Celsius and 373.15 K is the same as 100 Celsius.
Kepler's first law
Relationship in planetary motion that each planet moves in an elliptical orbit, with the sun located at one focus.
Kepler's laws of planetary motion
The three laws describing the motion of the planets.
Kepler's second law
Relationship in planetary motion that an imaginary line between the sun and a planet moves over equal areas of the ellipse during equal time intervals.
Kepler's third law
Relationship in planetary motion that the square of the period of an orbit is directly proportional to the cube of the radius of the major axis of the orbit.
Kilo calorie
The amount of energy required to increase the temperature of one kilogram of water one degree Celsius: equivalent to 1,000 calories.
Kilogram
The kilogram is the SI unit of mass. It is defined as the mass of a particular cylinder of platinum.
Kinetic Energy
Energy possessed by a body by the virtue of its motion is called kinetic energy. Kinetic energy = 1/2 m vē.
Kinetic friction
A friction force between surfaces that are slipping past each other.