Group Members:
Physicist Terrell Merrill
Physicist Victoria Brown
4-17-08
11-2
Objective: The objective of this experiment has to do with the force required to change the speed or direction of a moving object. It also was see if it takes more force to change the speed or direction of a moving object than it does to maintain the initial speed of the object.
Hypothesis: I think the same force required to accelerate an object is the same to change the direction of an object.
Materials:
8" string
Hall’s cart
200g mass
string scale
Procedure:
1. Cut a piece of string about 8" long.
2. Tie one end to the front of the Hall’s cart and tie a loop in the free end.
3. Put the 200g mass in the Hall’s cart.
4. Zero the spring scale and attach the hook on the spring scale to the string loop on the cart.
5. Start moving at a slow speed by pulling on the string scale.
6. Then quickly pull harder to accelerate the speed of the cart. Repeat this five times and record the maximum force reading on the spring scale each time.
7. Experiment with changing the direction of the cart. Start the cart rolling slowly by pulling on the spring scale and then pull the scale in a wide are to change the direction of the cart. Try this five times changing direction as quickly as you can without tipping the cart over. Record the maximum force to change direction each time.
Data:
Straight...
Trial 1: 1 N 100g
Trial 2: 1 N 100g
Trial 3: 0.5 N 50g
Trial 4: 1.3 N 130g
Trial 5: 1.5 N 150g
Changing Direction...
Trial 1: 0.5 N 50g
Trial 2: 1.6 N 160g
Trial 3: 1 N 100g
Trial 4: 1.4 N 140g
Trial 5: 1.3 N 130g
Graphs/ Pictures:
Conclusion: In conclusion my hypothesis was kind or correct. My readings of the spring scale were not constant when the Hall’s cart was pulled straight or when it was changing its direction. In both areas they had at least two of the same forces but in different trials. I learned in this experiment that it takes almost the same to change the direction and to increase the speed.
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