• Center of Gravity (center of mass)
• Moment of Inertia
• Torque
ii
iii
CM m
xmx
2 2 2 21 1 2 2 3 3 .... ii
I m r m r m r m r
sinI rF
Conservation of Momentum
When is momentum conserved?
i fP P
Special Case: Perfectly Inelastic Collision
1 2
1 1 2 2 1 2
objects stick together
m
xf xf xf
xi xi xf
v v v
v m v m m v
• The spring’s equilibrium length is 30 cm. The mass of the fish is 4.0 kg, and causes the spring to stretch to a length of 42 cm.– What is the spring constant of the spring?– If an 8.0 kg fish is suspended, what will be the length of the
stretched spring?
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