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New Ch9 Lesson
Chapter 9B
Question | Answer |
---|---|
Distance Divided by Time | speed |
the unit of speed | m/s |
change in speed or direction | velocity |
velocity has the same _______ as speed except it has ______ | magnitude, direction |
change in velocity | Acceleration |
unit of acceleration | m/s/s |
A push or a pull | Force |
In order to accelerate an object, a _____ must be _____ | force, applied |
_______ is done when a force is applied | work |
Force = | Mass * Acceleration |
The unit of force | kg.m/s squared) * m = kg.m squared/s squared = Joule |
the unit of energy is the | joule |
1 kJ = | 1000 J |
1 cal = | 4.184 J |
1 kcal = | 4.184 kJ |
energy due to position or stored energy | Potential energy |
ex of Potential energy | Food(chemical energy) |
Formula to calculate Potential Energy | PE=m.g.h |
energy due to MOTION | kinetic energy |
Formula for kinetic energy | KE=1/2 mu squared |
energy of a molecule or atom when it moves from one place to another | translational kinetic energy |
energy results from when a molecule or atom flips end over end | rotational kinetic energy |
the atoms in a molecule or atom vibrate with respect to one another; similar to a spring | Vibrational kinetic energy |
in any chemical reaction or process, energy is conserved | the Law of Conservation of Energy |
________ is the sample of matter in the universe | system |
everything else in the universe that is not part of the system | Surroundings |
Open System | Allows exchange of heat and mass |
Closed System | Allows exchange of heat but no exchange of mass |
Isolated System | Does not allow exchange of heat or mass |
Process that absorbs or takes in heat is ____ | endothermic |
Process that releases heat is ____ | exothermic |
Vaporization | endothermic |
Fusion | endothermic |
Condensation | Exothermic |
Freezing | Exothermic |
Sublimation | Endothermic |
Deposition | Exothermic |
Decomposition of Limestone | Endothermic |
Decomposition of water | Endothermic |
Formation of water | Endothermic |
Formation of water | Exothermic |
Combustion of carbon | exothermic |