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Tuesday, November 25, 2014

Monday, November 17, 2014

Lab #3 – Calculating Work

Lab #3 – Calculating Work

Work = Force x distance
Work = (Force)(Distance)
W = Fd

Problem
How can a ramp help us pull a heavy object up to a greater height?

Hypothesis
Skip 3 lines here

Materials
Ruler, chair, ramp (inclined plane), weights, spring scale, various metallic objects


Procedure

Results
A.Work done without ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight
__N
__cm
___J
50 g Weight



100 g Weight



200 g Weight



500 g Weight



 Metal Object






B. Work done with ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight
 N
cm 
50 g Weight



100 g Weight



200 g Weight



500 g Weight



Metal Object




 Make another Hypothesis: Use your hands to feel the sandpaper.  Which of these will cause more work to be done on the weights? 

C.Work done with sandpaper on ramp
Object
Force (Newtons)
Distance (cm)
Work (Joules)
20 g Weight



50 g Weight



100 g Weight



200 g Weight



500 g Weight



Metal Object



Length of ramp = ___cm



ANALYSIS
1)   Construct a line graph for results A, B, and C on the same coordinate plane.  Label the x-axis weights (grams) and label the y-axis work (Joules). 
2)   How did the weight (force pulling down) affect the amount of work done on the object?
3)   Compare/Contrast the trial with the least amount of work to that with the most amount of work.
4)   Part 1 (A,B): What is your Independent Variable?
5)   Part 1 (A,B): What is your Dependent Variable?
6)   Part 1 (A,B): What are your Constants?
7)   Part 2 (B,C): What is your Independent Variable?
8)   Part 2 (B,C): What is your Dependent Variable?
9)   Part 2 (B,C): What are you Constants?

10)               Make an inference: Which would increase the friction of the object you are pulling, adding oil to the ramp or glue?  Why would you expect this?


Conclusion

 What was your problem?
 Restate your hypothesis.  Was it right? wrong?  why or why not?
 What did you learn in this lab?
 What did you like about this lab?
 What were some challenges you had to deal with?
 What could you do next with this problem?  What other tests could you perform?
 Write down any other additional thoughts, observations, inferences, etc.