- 1J10. Finding Center of Gravity
- 1J10.09 Center of Mass Cardboard box with weight on one side exhibits unpredictable properties due to asymmetric center of mass.
- 1J10.12 Hanging Shapes Use the plumb bob method to find the center of gravity of an irregularly shaped object.
- 1J10.25 Center of Gravity of a Broom Bring your fingers together under a broom to find the center of gravity.
- 1J10.30 Meter Stick on Fingers Slide your fingers together under a meter stick and they meet at the center of gravity. Add unequal masses to the meter stick and repeat.
- 1J11. Exceeding Center of Gravity
- 1J11.15 Tipping Block On Incline A block is placed on an incline and the incline is raised until the block tips.
- 1J11.20 Leaning Tower of Lire Stack blocks until the top block sticks out beyond any part of the bottom block.
- 1J11.30 Instability in Flotation A top-heavy styrofoam slab demonstrates instability in floatation.
- 1J11.40 Human Center Of Gravity Stand with right shoulder and foot against the wall and raise your left foot. Stand with your heels against the floor and try to touch your toes.
- 1J20. Stable, Unstable, and Neut. Equilibrium
- 1J20.11 Balance Cone A large cone shows stable, unstable, and neutral equilibrium.
- 1J20.15 Block on Cylinder A rectangular block of wood is placed on a cylinder first with the width less than the radius (stable) and then with the width greater (unstable).
- 1J20.20 Fork Spoon Match Place a spoon and match in the tines of a fork and balance the assembly on a small surface area.
- 1J30.22 Tension in a Spring Pull on two spring scales connected together to show they will read the same value.
- 1J20.25 Twelve Nails On One A technique to balance ten landscape spikes on the head of a single upright spike.
- 1J20.30 Hanging Belt Shows a “belt hook” for the hanging belt.
- 1J20.32 Spoon On Nose Hang a spoon on your nose.
- 1J20.45 Tightrope Walking A toy unicycle rider carrying a balancing pole travels along a string.
- 1J20.60 Wine Butler Stick the neck of a wine bottle through a hole in a slanted board and the whole thing will stand up.
- 1J20.65 Balancing Soda Can Partially fill a soda can with water and balance on its indented bottom edge.
- 1J20.70 Double Cone As a double cone moves up an set of inclined rails, its center of gravity lowers.
- 1J30. Resolution of Forces
- 1J30.10 Suspended Block Use weights to counter the gravitational force of a block resting on an incline, then remove the incline to show the block doesn’t accelerate.
- 1J30.15 Normal Force of Blocks on Incline Demonstrates difference in normal forces of a block on a flat surface and a block resting on an incline.
- 1J30.20 Tension in a String A versatile apparatus that demonstrates the different tensions in a string that result from various arrangements of a weight and pulley.
- 1J30.26 Rope and Three Weights Suspend a rope over two pulleys with masses on the ends and hang another mass from the center. Measure the deflection.
- 1J30.35 Rope and Two Students A long rope is suspended between a fixed object and a student.
- 1J30.50 Vertical Force Table A force table in the vertical plane.
- 1J30.60 Sailing Upwind Use a box fan to blow at an air track glider with a sail.
- 1J30.70 Rice in a Tube Fill a tube with a few inches of rice, and push down on the top of the rice with a rod.
- 1J30.75 Stand On An Egg Three eggs in a triangle pattern in foam depressions between two plates will support a person.
- 1J40. Static Torque
- 1J40.10 Grip Bar Demonstrates distance-dependance of torque.
- 1J40.15 Torque Wrench A torque wrench is used to break aluminum and steel bolts.
- 1J40.20 Torque Beam Weights are hung from a meter stick suspended on a knife edge.
- 1J40.21 Torque Hinge Board Use a spring scale to lift a hinged board from various points along the board.
- 1J40.25 Torque Wheel Weights can be hung from many points on a vertical disc pivoted at the center.
- 1J40.41 Loaded Beam A weight is hung at known distances between two identical scales.
- 1J40.50 Roberval Balance Neutral equilibrium is maintained at any position on the platform.