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INDEX B2 : LINEAR KINEMATICS

B2.01 POP AND DROP (Velocity Components)

A ball is projected horizontally while another ball is dropped from the same height. The balls are heard to land together.

B2.02 SHOOT THE MONKEY (Velocity Components)

An enactment of the Hunter-Monkey problem.

B2.03 COMPONENTS OF A FORCE (Vectors)

A cylinder is balanced on an inclined plane by two strings, one parallel to the plane and one normal. The plane is removed, and the cylinder stays put.

B2.04 GALILEO ON THE MOON

Video of an astronaut on the moon performing Galileo's experiment of dropping a feather and a weight simultaneously.

B2.05 FEATHER & COIN

Two tubes, one evacuated and one with air, are upended, and the speed of fall of their contents compared.

B2.06 GALILEO'S PENDULUM (Conservation of Energy)

The length of a pendulum is shortened, without affecting the height to which it rises.

B2.07 SAVING FACE (Conservation of Energy)

The Lecturer releases a pendulum bob held against its nose and does not flinch on the backswing.

B2.08 NEWTON'S BALLS (Elastic Collisions)

Steel balls hang in a row. When a number of balls are displaced from one end and released, the collision sends an equal number of balls away from the other end.

B2.09 UPHILL CONE (Center of Gravity)

A cone on wooden rails appears to roll uphill.

B2.11 UNIFORM ACCELERATION ON THE AIR TRACK

As a cart slides down the tilted air track, the distance traveled per time interval increases geometrically.

B2.13 INERTIAL MASS

Masses are placed on an inertial balance. A large mass has a longer period of oscillation than a small mass.

B2.14 LESS AND LESS FRICTION (Newton's First Law)

As the ideal frictionless state is approached by increasingly closer approximations, motion approaches that predicted by the First Law. This is most easily shown by using the air track with a the air supply run off of a Variac. As the voltage is increased, friction is reduced, and the motion of the cart approaches that predicted by Newton's First Law.

B2.15 SLIDING BLOCK (Kinetic Friction)

A block with different surfaces of different area is dragged across a rough surface. A scale attached to the block shows that the coefficient of friction is approximately independent of contact area.

B2.16 DRAGGING THE BOX (Kinetic Friction)

A spring balance attached to a box dragged across the lecture bench shows the transition from static to kinetic friction.

B2.17 SAND PILE (Coefficient of Static Friction)

The coefficient of static friction between sand and sand is estimated from the slope of a sand pile.

B2.18 ANGLE OF REPOSE (Static Friction)

Objects are placed on the inclined plane, and the slope is increased until they start to slide.

B2.20 KINETIC FRICTION & NORMAL FORCE

A meter stick is balanced on the Lecturer's index fingers. The fingers are brought together and meet at the point of balance, regardless of where they started.

B2.21 WEIGHT IN FREEFALL

A mass is hung from a spring balance which is then dropped. As it falls, the balance reads less.

B2.23 ROTATIONAL TO TRANSLATIONAL ENERGY

A disk rolls down rails to the bench whereby rotation is changed to faster translation.

B2.24 LINEAR MOMENTUM IS A VECTOR

With a running start, the Lecturer jumps on the cart. An assistant runs and jumps on also, once running with the cart and once against.

B2.25 COLLISIONS AT A DISTANCE

Dynamics carts with large horseshoe magnets attached rebound without physical contact.

B2.26 COEFFICIENT OF RESTITUTION

Different materials rebound to different heights.

B2.29 KINEMATICS AND DYNAMICS OF ONE DIMENSIONAL MOTION

A series of demonstrations using the air track.

B2.30 KINEMATICS AND DYNAMICS OF TWO DIMENSIONAL MOTION

A series of demonstrations using the air table.

B2.31 HALL'S CARRIAGE (Newton's Second Law)

A carriage is pushed horizontally and ejects a ball vertically. The ball lands in the carriage.

B2.32 ELASTIC COLLISION OF UNEQUAL (3:1) MASSES

The special case of masses M and 3M.

B2.33 NEWTON'S SECOND LAW

A falling mass accelerates a cart on the air track.

B2.34 CONSERVATION OF MOMENTUM IN AN EXPLOSION

Two carts on the air track are joined by a gunpowder cell. The gunpowder is ignited. The carts rebound off the ends of the track and stop when they rejoin.

B2.35 PARALLEL PENDULUMS

Two pendulums with a 4:1 length ratio are hung in the same vertical plane. Their periods have a 2:1 ratio.

B2.36 SOUND OF CONSTANT ACCELERATION

String with weights at 1:4:9:16:25 cm is dropped. The weights are heard to land at equal time intervals.

B2.37 MAGIC CARS

A trick demo with a tunnel over the air track. When a cart is sent down the track, it appears to change color while passing through the tunnel.

B2.38 FORCE BOARD (Components Of Forces)

The force of gravity is balanced by the tension in two strings, illustrating vector addition of forces.

B2.39 CEILING PENDULUM

A heavy bob on a long string.

B2.40 PILEDRIVER

The conversion of potential energy into kinetic: a falling weight drives a nail into a wooden block.

B2.41 BALLISTIC PENDULUM

A ballistic pendulum is used to measure kinetic energy.

B2.42 MONKEY PROGRAM

A computer simulation of the Hunter-Monkey problem.

B2.44 WATER ROCKET

Newton's Second and Third Laws. Air is feeble fuel compared to water.

B2.45 PROJECTILE DETERMINATION OF G

A ball is projected from the lecture bench onto the floor. Analysis of its flight provides a value for G.

B2.46 CAVENDISH BALANCE

A qualitative demonstration of a Cavendish balance.

B2.47 VARIABLE G PENDULUM

By rotating the plane of oscillation of a rigid pendulum, the component of gravity accelerating the pendulum is varied. The period increases as the angle of rotation is increased, and the quantity cos theta * T^2 is a constant.

B2.48 SPACE TOY

A trick demonstration. An object rolls back and forth between the ends of a shallow trough in apparent perpetual motion. If the object is started from below the end of the trough, it will climb higher in apparent violation of energy conservation.

B2.50 FRAMES OF REFERENCE

The Ivey-Hume classic available in 16mm or video disk.

B2.51 ATWOOD'S MACHINE

Two nearly equal masses are connected by a string which is run over a pulley. G can be calculated from the acceleration of the masses.

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