Launch, Cut and Catch

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Launch, Cut and Catch

• A weight is hung by a string.
• It is raised--measurements are taken.
• Landing point calculations are made.
• A can is placed at the impact point.
• The weight is releasedthe launch.
• When it reaches the vertical, it is cut.
• Andthe catch ?/??.

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View video?
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Launch, Cut and Catch--1

• The weight is liftedthats work.
• This work adds energy to the systempotential
  energy.
• After the release, this potential energy becomes
  kinetic energy.

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Launch, Cut and Catch--2

• After the cut, all energy is KE.
• The weight is now free-falling with some
  horizontal velocity.
• Its flight path is parabolic.
• Predict where it will land.

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Launch, Cut and Catch--3

• Variables
• dy height of weight at vertical (above?)
• h height weight is raised
• m mass of weight
• vx horizontal velocity of weight
• vi,y initial vertical velocity of weight
• t time TOF (time of flight)
• dx horizontal distance

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Launch, Cut and Catch--4
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Launch, Cut and Catch--5
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Launch, Cut and Catch--6
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Launch, Cut and Catch--7

• materials/station
• weight 2 ceiling hooks
• string scissors
• paper clip 2 meter sticks
• masking tape marking pen

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Launch, Cut and Catch--8

• materials/class
• plumb bobs
• 2 ring stands
• 2 clamps
• cutter (hot-glue razor to paint stirrer)
• large can (half-filled with sand)
• butane lighter
• video camera

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Launch, Cut and CatchEC1

• Want something more challenging?
• Try this
• A weight hangs from 1.50 m string and is 1.00 m
  above the ground.
• It is drawn back 60º from the vertical, released
  and cut 30º past the vertical.
• Where will it land?

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Launch, Cut and CatchEC2

• Want another challenging problem?
• Try this
• Take these measurements
• mass of the weight
• mass of the can sand
• distance the can sand weight slid
• Calculate the coefficient of friction.