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Chapter6 Work and Energy, NG HUI YUN A20SC0187 - Coggle Diagram
Chapter6
Work and Energy
Work Done by Constant Force
Definition of Work:
Work is the product of magnitude of displacement multiplied by the componet of force parallel to the displacement.
W=Fd||
'||' indicates parallel
W=Fdcosθ
Work is a scalar quantity
Unit: Nm or J
(1Joule=1Nm)
Scalar Product of 2 Vectors
Dot product
Work Done by Varying Force
Work done = area under curve F/x
W =
Work Done by a Spring Force
Hooke's Law
F=kx
k=spring constant, a measure of string stiffness
W=½kx²
W ∝ x²
same W to stretch/compress same x
Kinetic Energy and Work-Energy Principle
Energy is a conserved quantity
Tarnslational Kinetic Energy, K = ½mv²
Net Work Done, Wnet = K₂-K₁
Wnet = △K
Work-Energy Principle
The net work done on an object is equal to the change in the object's kinetic energy.
NG HUI YUN
A20SC0187
