Force and Torque 
Discussion 
Streaming 
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Demo Page 
Mass on Spring, light

A spring will be stretched a distance proportional to the amount of mass that is added to the spring. 
Real

Real
MPG 

Mass on Spring, medium

A spring will be stretched a distance proportional to the amount of mass that is added to the spring. 
Real

Real
MPG 

Mass on Spring, heavy

A spring will be stretched a distance proportional to the amount of mass that is added to the spring. 
Real

Real
MPG 

FourteenHook Bar

Different combinations of mass and distance are required to balance the torques on the stick. 
Real

Real
MPG 

OddShaped Bar

Different combinations of mass and distance are required to balance the torques on the odd shaped bar. 
Real

Real
MPG 

Torque Wrench

Extending the length of a wrench's handle allows for more torque, allowing a person to loosen a stubborn bolt. 
Real

Real
MPG 

Newton's First Law 
Discussion 
Streaming 
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Demo Page 
Tablecloth Pull

The objects on the table tend to stay at rest due to their inertia. 
Real

Real
MPG 

Toilet Paper

If you pull the toilet paper slowly, you will over come the inertia of the roll and pull off lots of paper. However, if you pull quickly, you cannot overcome the inertia and the paper rips off. 
Real

Real
MPG 

Inertia Rods

These rods weigh the same, but due to the distribution of the mass, one is harder to rotate than the other. 
Real

Real
MPG 

Mass and Center of Mass 
Discussion 
Streaming 
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Demo Page 
Magic Bird

Only the center of mass of an object needs to be supported in order to support the object. The bird's center of mass in at it's beak. 
Real

Real
MPG 

Horse and Rider

Only the center of mass of an object needs to be supported in order to support the object. The horse and rider's center of mass is under the hind legs. 
Real

Real
MPG 

Double Cone and Plane Trick

Look carefully; the center of mass of the cone is actually rolling down hill. An optical illusion makes it look like its rolling up. 
Real

Real
MPG 

Feebleminded Disk

The center of mass of the disk is not in the center as you might expect. Thus, placing the center of mass off center can create the torque need to roll the disk uphill. 
Real

Real
MPG 

Different Forces, Different Motions 
Discussion 
Streaming 
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Demo Page 
Simultaneous Fall

One ball, having only a gravitational force, will fall straight down. The other ball, having gravity and a horizontal force, will follow a parabola. Watch it in slow motion. 
Real

Real
MPG 

Rotating Bucket

The bucket (and water contained therein) experiences centripetal acceleration when swung in a circle. 
Real

Real
MPG 

Newton's Third Law 
Discussion 
Streaming 
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Demo Page 
Exploding Carts, equal mass

Because these carts are of equal mass, they will have the same velocities and momentums after release. 
Real

Real
MPG 

Exploding Carts, unequal mass

Because these carts are NOT of equal mass, they will NOT have the same velocities after release. Instead, their velocities are inversely proportional to their mass; i.e. the bigger mass will have the smaller velocity. Their momentums will still be equal. 
Real

Real
MPG 
