# Physics 3 Equilibrium, Torque, energy.txt

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• Define a system in equilibrium
• The net force in a system is equal to zero.
• This means there is no acceleration
1. How to solve equilibrium problems
• Put opposing forces equal to each other.
• In not in equilibrium, add ma to weaker side
2. Define torque and give equations
• Torque: rotational force
• T=Flsin(theta)
3. What are the units of Energy
• Joule (J): in macroscopic world 1
• Electron-volt (eV): in microscopic wold
4. Name mechanical energies and give equations
• Kinetic: (1/2)mv^2
• Gravitational potential: mgh
• Elastic potential: (1/2)kΔx^2
5. How is energy transfered
Heat or work
6. Give equations for work and how do you know if work is being done
• W=fdcos(theta) when no friction is present
• W=ΔK+ΔU+ΔE(friction) no heat
• 1: define a system
• 2: does heat of system or surrounding change. If there. Is no heat, all energy is transfered into work
7. What are the conservative forces, and how do you tell if a force is conservative or not?
• 1: gravity
• 2: Hooke's law forces
• 3: electromagnetic
• No displacement occurs (loop) and ΔE is the same regardless of the path taken. Force is dependent on position
8. How are non-conservative forces different from conservative ones? What is the equation?
• Mechanical energy will change when work is done. Energy change is not stored as potential energy
• W=ΔK+ΔU
9. Define power and give the equation and units
• Power: rate of energy transfer or work done on system (E changes when work is done ΔE=W+h
• Watt: J/sec
• P=ΔE/time or ΔW/time
• Instantaneous power=Fvcos(theta)
 Author: p.reilly1227 ID: 233868 Card Set: Physics 3 Equilibrium, Torque, energy.txt Updated: 2013-09-09 22:27:49 Tags: Physics Equilibrium Torque energy Folders: Description: Physics 3 Equilibrium, Torque, energy.txt Show Answers: