Work Flashcards
Work Done by a Force, Mechanical Advantage, Work Kinetic Energy Theorem, Conservative Forces
Non-friction work is defined as: ____
Unit: ____
Non-friction work is defined as: W = Fd cosθ
Unit: Joules (Nm)
Work is the transfer of ____ through a ____
Work is the transfer of ENERGY through a FORCE
All work is ____ but not all ____ is work
All work is ENERGY TRANSFER but not all ENERGY TRANSFER is work
W = Fd cosθ
W - ____
F - ____
d - ____
cosθ - ____
W = Fd cosθ
W - WORK
F - FORCE on a system
d - DISPLACEMENT
cosθ - ANGLE between Force and Displacement
For energy transfer due to forces that are not heat, the work done is defined as: ____
Unit: ____
For energy transfer due to forces that are not heat, the work done is defined as: W = ΔK + ΔU + ΔEᵢ
Unit: Joules (Nm)
For energy transfer due to forces that are not heat or friction, the work done is defined as: ____
Unit: ____
For energy transfer due to forces that are not heat or friction, the work done is defined as: W = ΔK + ΔU
Unit: Joules (Nm)
W = ΔK + ΔU + ΔEᵢ
W - ____
K - ____
U - ____
Eᵢ - ____
W = ΔK + ΔU + ΔEᵢ
W - WORK
K - KINETIC ENERGY
U - POTENTIAL ENERGY
Eᵢ - INTERNAL ENERGY
There are only 2 ways that energy can leave a system: ____ and ____
There are only 2 ways that energy can leave a system: WORK and HEAT
Energy can be defined as: ____
Unit: ____
Energy can be defined as: ΔE = W + q
Unit: Joules (Nm)
If the total work done by a force is zero, the force is said to be ____
If the total work done by a force is zero, the force is said to be CONSERVATIVE
The law of conservation of mechanical energy is: ____
Unit: ____
The law of conservation of mechanical energy is: 0 = ΔK + ΔU
Unit: Joules (Nm)
Conservative forces don’t do ____
Conservative forces don’t do WORK
____ forces change the mechanical energy of a system when they do work
NON-CONSERVATIVE forces change the mechanical energy of a system when they do work
Non-conservative forces do work as defined by the equation: ____
Unit: ____
Non-conservative forces do work as defined by the equation: W = ΔK + ΔU
Unit: Joules (Nm)
Work done by a kinetic friction force is defined as: ____
Unit: ____
Work done by a kinetic friction force is defined as: fᴷd cosθ = ΔK + ΔU
Unit: Joules (Nm)
Machines are mechanical devices that reduce ____ while doing work
Machines are mechanical devices that reduce FORCE while doing work
Ideal machines reduce ____ but don’t change ____
Ideal machines reduce FORCE but don’t change WORK
A ramp uses the force equation: ____
A ramp uses the force equation: F = mg sinθ
A lever uses the force equation: ____
A lever uses the force equation: F = mg (d₁/d₂)
d₁ - distance to weight
d₂ - distance to fulcrum
A pulley uses the force equation: ____
A pulley uses the force equation: F = mg / (number of cords)
