Differences between revisions 1 and 2

Statistics of Rigid Bodies

PIRA classification 1J

1J10. Finding Center of Gravity

PIRA #	Demonstration Name	Abstract
1J10.09	center of gravity	Many examples of simple center of mass demonstrations.
1J10.10	map of state	Suspend a map of the state from holes drilled at large cities to find the "center of the state".
1J10.10	map of state	Sandwich of a map of the state between two plexiglass sheets and suspend from holes drilled at large cities to find the "center of the state".
1J10.10	map of Minnesota	A plexiglass map of the state is suspended from several points.
1J10.11	find the center of gravity	Use a chalk line on the plumb bob and snap it to make a quick vertical line.
1J10.12	hanging shapes	Use the plumb bob method to find the center of gravity of various geometric shapes.
1J10.12	hanging board	Suspend an irregular board from several points and use a plumb bob to find the center of gravity.
1J10.12	irregular object center of mass	Suspend an irregular object from several points and find the center of mass with a plumb bob.
1J10.15	hanging potato	Hang a potato from several positions and stick a pin in at the bottom in each case. All pins point to the center of gravity.
1J10.20	meter stick on fingers	Slide your fingers together under a meter stick and they meet at the center of gravity. Add a baseball hat to one end and repeat.
1J10.20	friction and pressure	Slide your fingers under the meter stick to find the center of mass.
1J10.20	meter stick on fingers	Slide your fingers under a meter stick to find the center of mass.
1J10.25	center of gravity of a broom	Bring your fingers together under a broom the find the center of gravity.
1J10.25	center of gravity of a broom	Find the center of gravity of a broom, hang a kg mass somewhere on the broom, find the new center of gravity, calculate the weight of the broom by equating torques.
1J10.26	balance beam and bat
1J10.30	meter stick on fingers
1J10.30	loaded beam - moving scales	Slide the scales together under a loaded beam noting the scale readings of the moving and stationary scales.
1J10.30	loaded beam - moving scales	Instead of moving the masses on the beam, move the scales under the beam. Same as bringing your fingers together under the meter stick.
1J10.41	your center of gravity	Two methods for measuring the center of gravity of a person are shown.

1J11. Exceeding Center of Gravity

1J20. Stable, Unstable, and Neut. Equilibrium

1J30. Resolution of Forces

1J40. Static Torque

[:Demonstrations:Demonstrations]

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||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
||1J10.09||	center of gravity||	Many examples of simple center of mass demonstrations.||
||1J10.10||	map of state||	Suspend a map of the state from holes drilled at large cities to find the "center of the state".||
||1J10.10||	map of state||	Sandwich of a map of the state between two plexiglass sheets and suspend from holes drilled at large cities to find the "center of the state".||
||1J10.10||	map of Minnesota||	A plexiglass map of the state is suspended from several points.||
||1J10.11||	find the center of gravity||	Use a chalk line on the plumb bob and snap it to make a quick vertical line.||
||1J10.12||	hanging shapes||	Use the plumb bob method to find the center of gravity of various geometric shapes.||
||1J10.12||	hanging board||	Suspend an irregular board from several points and use a plumb bob to find the center of gravity.||
||1J10.12||	irregular object center of mass||	Suspend an irregular object from several points and find the center of mass with a plumb bob.||
||1J10.15||	hanging potato||	Hang a potato from several positions and stick a pin in at the bottom in each case. All pins point to the center of gravity.||
||1J10.20||	meter stick on fingers||	Slide your fingers together under a meter stick and they meet at the center of gravity. Add a baseball hat to one end and repeat.||
||1J10.20||	friction and pressure||	Slide your fingers under the meter stick to find the center of mass.||
||1J10.20||	meter stick on fingers||	Slide your fingers under a meter stick to find the center of mass.||
||1J10.25||	center of gravity of a broom||	Bring your fingers together under a broom the find the center of gravity.||
||1J10.25||	center of gravity of a broom||	Find the center of gravity of a broom, hang a kg mass somewhere on the broom, find the new center of gravity, calculate the weight of the broom by equating torques.||
||1J10.26||	balance beam and bat||	||
||1J10.30||	meter stick on fingers||	||
||1J10.30||	loaded beam - moving scales||	Slide the scales together under a loaded beam noting the scale readings of the moving and stationary scales.||
||1J10.30||	loaded beam - moving scales||	Instead of moving the masses on the beam, move the scales under the beam. Same as bringing your fingers together under the meter stick.||
||1J10.41||	your center of gravity||	Two methods for measuring the center of gravity of a person are shown.||

fw: Diff for "RigidBodies"

Statistics of Rigid Bodies

1J10. Finding Center of Gravity