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INDEX B3 : ROTATIONAL KINEMATICS

B3.01 WHIRLAGIG (BALL ON STRING, WITH TUBE)

Weights hanging from a string apply a force to a ball rotating horizontally, relating force,speed and radius.

B3.02 CENTRIPETAL FORCE (QUANTITATIVE)

Uses a special apparatus to quantitatively measure the force causing a mass to swing outward as it rotates.

B3.03 BICYCLE WHEEL & ROTATING CHAIR (Angular Momentum)

Demonstrator on chair inverts spinning bicycle wheel and is accelerated.

B3.04 RULER RACES

Two rods, pivoted at one end, are released. How do the variables of length and mass effect the time of fall?

B3.05 CONICAL PENDULUM (Uniform Circular Motion)

Pendulum from the ceiling moving in a circular path.

B3.06 FOUCAULT PENDULUM

A tabletop model of a Foucault pendulum.

B3.07 FLATTENING OF THE EARTH (Centripetal Force)

A deformable sphere flattens as it rotates.

B3.10 WALKING THE SPOOL (Instantaneous Axis of Rotation)

The behaviour of a spool on a table varies depending on where the torque is applied.

B3.11 DESCENDING SPOOL (Rotational Inertia)

As a spool falls, it accelerates downwards slowly but accelerates in rotation rapidly.

B3.12 ROTATING CHAIR & THROWING WEIGHTS AROUND (Moment Arm)

A weight thrown radially does not effect circular motion, but a weight thrown tangentially does.

B3.13 ROTATING WEIGHTS (Rotational Inertia)

Sliding weights move outward when their axle is rotated.

B3.14 WRAP AROUND (Rotational Kinetic Energy)

The string holding a rotating ball in a horizontalcircle wraps around a vertical axis. As the string shortens, the ball's angular velocity increases.

B3.15 ROLL AROUND (Rotational Kinetic Energy)

A marble spirals down a large funnel. As the radius grows smaller, so does the period.

B3.16 THE STRANDED DEMONSTRATOR (Torque)

The Demonstrator sits still on the frictionless chair. Without an external torque, rotation is impossible.

B3.17 SUITCASE GYROSCOPE (Gyroscope)

A gyroscope is hidden inside a suitcase, making the suitcase difficult to turn.

B3.19 ROTATING CHAIR & DOUBLE BICYCLE WHEEL (Angular momentum)

When the two wheels rotate in opposite directions, inverting the wheels imparts no rotation.

B3.20 HAND HELD GYROSCOPE (Rotational Dynamics)

Illustrates the effects of a torque upon a rotating system.

B3.21 WHEEL BALANCING (Rotational Dynamics)

Weights can be added to a rotating disk either symmetrically or asymetrically.

B3.22 BICYCLE WHEEL

A large bicycle wheel for display purposes.

B3.23 HANGING GYROSCOPE

A spinning bicycle wheel hangs from the ceiling as a gyroscope.

B3.24 FLYING POKER CHIPS

Poker chips line the radius of a table. As the table is spun, the chips closest to the edge spin off the table.

B3.25 INSTANTANEOUS ANGULAR ACCELERATION

Measure the time it takes the tip of a rod to fall short distance and calculate the angular acceleration.

B3.26 SPEED OF DESCENT

Weights hang from a string run over a pulley and wrapped around a shaft. When released, the shaft turns and the weights descend. When the experiment is repeated with a bigger shaft, the weights descend more slowly.

B3.32 UNBALANCED ROTATOR

A cylinder rotates on shafts perpendicular to its axis. Arms with movable weights can be attached in various places to produce conditions of static and dynamic balance and unbalance.

B3.34 AIR TABLE CENTRIPETAL FORCE

A string through the center of the table constrains a puck to move in circles.

B3.36 LOOP THE LOOP

How high up the track must the ball start in order to not fall off the loop?

B3.37 PULLEY RACES

Relates speed of descent to pulley radius.

B3.40 CIRCULAR MOTION ACCELEROMETER

A ball inside a water-filled tube indicates the direction of acceleration.

B3.41 BALL ON A STRING

A prop for discussing circular motion.

B3.42 WHERE'S THE DOORKNOB?

Show how the force required to open a door varies with the placement of the doorknob.

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