Action and Reaction

Physicist Danysha Miller
Group Members:
Physicist Terrell Merrill
Physicist Victoria Brown
4-6-08
11-2

http://collegebounddanysha.blogspot.com/

Objective: To identify if there will be an equal opposite reaction when you use the rod as a sling shot.

Hypothesis: I think that the steel rod might fly at a fast speed which directs to some where. The cart might push back giving it a reaction from the steel rod.

Materials:
steel Rod
Hall’s Cart
paper clip
rubber band

Procedure:
1.)Find an open area on smooth floor or smooth surface as in table.
2.)Attach one end of the rubber band to the hole in the front of the cart with a piece of string or a paper clip. Hook one end of the steel rod into the other end of the cart.
3.)Pull the steel rod back in the slingshot until there is good tension on the rubber band. Then hold the cart and rod in place with one hand.
4.)Release both the cart and rod at the same time as you let go. Repeat several times, stretching the rubber band the same amount each time.


Trial 1: The cart stayed still, the steel rod went flying.
Trial 2: No Motion
Trial 3: The cart moved backwards and the steel rod moved in a forward direction.
Trial 4: No motion with the cart, but the steel rod moved forward (flying).
Trial 5: Cart moved forward direction, and the steel rod moved backwards.
Trial 6: Cart moved backwards, and steel rod moved faster than trial 1, 3 and 4.
Trial 7: Steel rod moved forward (fast) and rolled off the table.
The cart moved in the same direction as the rod but not onto the floor.

Equation:
F= m∙a

Graphs/ Pictures:






Conclusion: My hypothesis was correct, because the steel rod was flying away from the Hall’s Cart. Sometimes the cart moved but not with the same speed with the steel rod. The direction that the steel rod moved was forward. Sometimes the cart went backwards or forwards on the table. Plus, the slingshot follows Newton’s 3rd Law.

Force and Mass

Physicist Danysha Miller
Group Members:
Physicist Terrell Merrill
Physicist Victoria Brown
4-6-08
11-2


Objective: The objective of this eperi9ment was to test Newton's Second Law again. But this time we needed to figure out if it takes more force to accelerate an ojbect with greater mass.

Hypothesis: I think that it will require more force with a 200g mass to accelerate the Halls's cart.

Materials:
steel rod
piece of string [1m long]
paper clip
Hall's cart
200g mass
washers


Procedure:
1. Tape the steel rod to the edge of a table so that it is directly over the edge. This will act to feduce friction in the experiment.
2.Cut a piece of string 1 meter long. Attach one end of the string to the Hall's cart using a paper clip.
3. Open up a paper clip to form a loop on one end and hook on the other. Tie the loop end of the paper clip to the free end of the string.
4. Put the cart on the table about 3/4 of a meter from the rod and hang the end of the paper clip over the rod. Put the 200g mass in the cart.
5. Add the washers to the paper clip hook one at a time until the cart begins to move. Carefully observe the speed of the cart as it moves along the table. Repeat 4-5 times and record the number of washers used each time.
6. Repeat step 5, but this time double the force by doubling the number. Observe the speed and acceleration of the cart carefully. Repeat several times. Record your results.
7. Repeat step 7, but this time triple the number of washers used in step 5. Observe the speed and acceleration of the cart carefully. Repeat several times. Record your results.


Data:
-SINGLE [100g mass]
Washer[s] 1- No Motion
Washer[s] 2- No Motion
Washer[s] 3- No Motion
Washer[s] 4- No Motion
Washer[s] 5- Moved at a constant speed to the floor.

----SINGLE [200g mass]
Washer[s] 1- No Motion.
Washer[s] 2- No Motion.
Washer[s] 3- Moved A Little.
Washer[s] 4- Moved A Little.
Washer[s] 5- No Motion.
Washer[s] 6- Moved at a constant pace to the floor.

-DOUBLE [100g mass]
Washer[s] 2- No Motion
Washer[s] 4- No Motion
Washer[s] 6- Moved at a slow motion.

----DOUBLE [200g mass]
Washer[s] 2- No Motion.
Washer[s] 4- No Motion.
Washer[s] 6- No Motion.
Washer[s] 8- Moved at a fast pace to the floor.

-TRIPLED [100g mass]
Washer[s] 3- Moved very slowly.
Washer[s] 6- Moved at an constant speed.
Washer[s] 9- Moved very quickly.


----TRIPLED [200g mass]
Washer[s] 3- Moved a little.
Washer[s] 6- Moved at a constant pace to the floor.

Graphs/ Pictures:





Equations:
-f=ma
-1 meter= 39.4 in.


Conclusion: In conclusion my hypothesis was correct. The cart with the 100g mass took less force to accelerate and the cart with the 200g mass weight took more force.