AP Physics 1 Energy
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Terms in this set (13)
Force applied to an object over a displacement. Joules. Displacement must be in direction of the force. Negative work is when energy is being transferred from the mass to the source of the force, like friction.
Rate at which the work is performed. Watts.
Energy of motion. KE=.5mv^2
Total work equals kinetic energy. W(total)=ΔKE
Energy stored within a system, not from motion. Forces related to potential energy are conservative forces.
Farther two masses are separated, greater potential energy is stored in the system. PE=mgh
Springs. More compressed or stretched away from its equilibrium point, the greater the potential energy. PE(elastic)=.5kx^2
Closer two similar charges are held or the farther apart two opposite charges are held, the greater the potential energy. PE(electrical)=qΔV
Kinetic and Potential energy, and if they are the only two forces present then they are conserved.
Law of Conservation of Energy
Initial mechanical energy must equal the final mechanical energy. KEi+PEi=KEf+PEf
Friction. Must by subtracted from Energy equations when present, because not conserved. KEi+PEi+Wnc/Ff=KEf+PEf