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Terms in this set (13)

Work

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.

Power

Rate at which the work is performed. Watts.

Power

P=W/t

P=ΔE/t

P=Fv

P=ΔE/t

P=Fv

Work Equations

W=Fdcosθ

Kinetic Energy

Energy of motion. KE=.5mv^2

Work-Energy Theorem

Total work equals kinetic energy. W(total)=ΔKE

Potential Energy

Energy stored within a system, not from motion. Forces related to potential energy are conservative forces.

Gravity PE

Farther two masses are separated, greater potential energy is stored in the system. PE=mgh

Elastics PE

Springs. More compressed or stretched away from its equilibrium point, the greater the potential energy. PE(elastic)=.5kx^2

Electrical PE

Closer two similar charges are held or the farther apart two opposite charges are held, the greater the potential energy. PE(electrical)=qΔV

Mechanical Energy

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

Nonconservative Forces

Friction. Must by subtracted from Energy equations when present, because not conserved. KEi+PEi+Wnc/Ff=KEf+PEf