CHAPTER 6: WORK AND ENERGY
Work Done by a Constant Force
KInetic Enegry and the Work Energy Prnciples
Work Done by a Varrying Force
Scalar Product of Two Vectors
distance moved multiplied by force
W= Fd cosθ where θ = the angle between force and displacement
S.I. Unit: Joule (J) 1J = 1Nm
Work done by a force is 0 when the Force is perpendicular to the distance. W= Fd cos 90° = 0J
Dot product
If the displacement Δx is small,
we can take the force F (x) as approximately constant and the work done is then, ΔW =F (x) Δx
Force is not constant.
Work Energy Principles
Kinetic Energy
Total Work Done =
Work Done by a spring
An object has Kinetic Energy if it has mass and it's moving.