Chapter 3 Flashcards
Work & Energy (27 cards)
Finding kinetic energy
KE = ½mv²
Determining work by gravity
ΔPE=mgh
Determining force of a spring
Fspring=½kx²
Finding work on an inclined plane
W=(Fcosθ)(Δx)
Work by change in kinetic energy
ΔKE = KEf - KEi
Work from power
W=Pt
Conversion of mechanical energy
PEi + KEi = PEf + KEf
Friction taking energy from an object
W= -fkΔx
When an object gains energy…
+ work is done on the object
- work is done on the system
When an object loses energy…
- work is done on the object
+ work is done on the system
Maximal work on an object is…
When the applied force is parallel to the displacement of an object
No work on an object is…
When the applied force is perpendicular to the displacement of an object
Kinetic energy definition
Energy of motion; energy an object has because it is in motion
Gravitational potential energy definition
Energy of an object due to its position in a gravitational field
Elastic energy definition
Energy stored in a spring
Chemical energy def
Energy stored in fuel
Calculating work without force
W = (ma)(Δx)
Calculating change in displacement
Δx= (vf²-vi²)/2a
Determining Δh
Δh = Δx(sinθ)
Law of conservation of energy (formula)
Ei + W[on system] = Ef
Mechanical energy of a system
E = KE + PE
Work from heat
Q = mcΔt
What should you consider when relating work and energy formulas together?
Does ANYTHING cancel out???
If so, remove that shit from your equation!
BONUS POINTS
HOLLAAA
What is power?
The rate of transferring energy or the rate of doing work.
How much work can be done per unit time, measured in watts
