december 14 physics. a train car (mass=1000 kg) rear ends a stationary boxcar (mass = 5000 kg)....
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December 14
Physics
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A train car (mass=1000 kg) rear ends a stationary boxcar (mass = 5000 kg). After the collision they stick together and move at 5 m/s. What was the velocity of the 1000 kg train car before?
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Objective:
To analyze our dart lab data.
Success criteria:
• Calculate the velocity of the dart before collision
• Examine the data for precision
• Justify the answer
• Evaluate the lab for possible errors
• Suggest improvements to the lab
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Lab: Tailgated by a dart
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Tail gated by a dartProblem: what is the velocity of the dart
before it hits the car?
Hypothesis: I believe that the dart goes -----m/s before it hits the car.
Procedure: sketch a diagram
Data table:– Mass of car– Mass of dart– Velocity of car + dart after
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Calculate: Obtain a numerical answer showing the relevant
stages in the working.
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Calculate the velocity of the dart before collision
Before crash After
(Dart )vd = (dart + car)v’
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Examine: Consider the lab in a way that uncovers the
assumptions andinterrelationships of the lab.
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Examine the data for precision
(Max – Min) / 2 x 100
Average
Examine the lab for assumptions
Examine the lab for interconnections (what depends on what?)
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Justify: Give valid reasons or evidence to support your
answer.
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Justify the answer
Show how your answer makes sense
• Is the answer realistic?
• Why, why not?
• How could you tell?
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Evaluate: Assess the implications and limitations; make judgments about the
ideas,works, solutions or methods in the lab.
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Evaluate: Assess the limitations of the lab, and make
judgments.
• useful features of lab
• Limitations of lab
• Is this lab valuable to do?
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Suggest: Propose a solution, hypothesis or other possible
answer.
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Suggest better:
• Procedure
• Equipment
• Measurement
• Etc.
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Out:
Suggest a whole new lab that would address the same concept: