Experiment 2

Force to Move Objects from Rest

Physicist Symone Gladden

Physicist Yanique Tomlinson

Physicist Darren Gibson

April 10,2008

Sec. 11-1

Objective: Is the force required to move an object from rest different from the force required to keep an object moving?

Hypothesis: The force to move an object from rest is more difficult than keeping an object moving.

Materials: Hall’s cart, wooden board, string, a 200 mg weight, a ruler

Procedure: 1. Cut a piece of string about 8” long. Tie one end to the front of the Hall’s cart and tie a loop in the free end.

2. Put the 200 gram mass in the cart.

3. Push the cart back and forth on the table and think about the problem statement. Do you think the force required to move the cart from rest is the same, less than, or greater than the force required to keep the cart moving? Write down this hypothesis before you begin the procedure.

4. Zero the spring scale and attach the hook on the spring scale to the string loop on the cart.

5. Tug on the spring scale several times to start the cart moving from rest. Note and record the spring scale reading each time.

6. Now jerk on the spring scale several times to rapidly start the cart from moving from rest. Note and record the spring scale readings.

7. Finally, pull the cart across the table or floor at a constant speed several times. Note and record the spring scale reading each time. Try this step again, pulling the cart at a faster speed and record your results.

8. Analyze your results. Which takes more force, to start an object from moving from rest or to keep and object moving? Which takes more force to start an object moving slowly or to start it moving quickly? Was your hypothesis correct? Does the cart follow Newton’s first law for a body at rest?

Data:

The objective of this experiment was to see if the force to move the cart from rust is the same, led than, is greater than the force required to keep the cart moving. First we jerked the spring scale several times to rapidly to start the cart moving from rest. We did this four times to see what our resdults would be. Next we pulled the cart across the table at a constant speed several times. After that we pulled at a faster speed. This helped us prove that the force to move a object from rest needs more force than to keep an object moving.

My hypothesis was correct. You would need a greater force because the cart is already stationary. I would have tried to make the speeds more accurate to improve the experiment. I learned how to measure speed in newtons per grans, I also learned how to put together a experiment to prove my hypothesis was correct.

Experiment 1

Objects at Rest Remain at Rest


Physicist Symone Gladden
Physicist Yanique Tomlinson
Physicist Darren Gibson
April 9,2008
Section 11-1





Objective: Do objects at rest really remain at rest unless acted upon by external force?

Hypothesis: The cart will move because of an external force.

Materials: Hall’s cart, wooden board, a 12" ruler


Procedure:
1. Conduct your hypothesis before you do the experiment.
2. Set the wooden ramp on a table with about 12” of the ramp extending over the edge of the tables.
3. Place the Hall’s cart on the part of the ramp that is on the table from under the cart.
4. The cart at this point is at rest. What do you predict will happen if the ramp is pulled out from under the cart?
5. Standing tone side, quickly jerk the ramp out from underneath the Hall’s cart. Try this 4-5 times. Record your observations each time.
6. Analyze your results. What happened to the cart when the ramp is removed? Was your hypothesis correct? Does the cart follow Newton’s first law for body of rest? Record your results and conclusion

Data: Trial 1-----the cart dropped
Trial 2----- the cart dropped with no movement
Trial 3-----the cart dropped
Trial 4-----the cart dropped then moved backwards

Graphs and pictures




There was a question that needed to be answered. Is Newton's first law correct? Well to answer that question there was an experiment that would prove his law would be true. As a group we chose to put a cart on top of a wooden ramp. Afterwards we jerked the wooden ramp from under the car to see if it would move. Our results supported Newton's first law. On the first and second trial the cart just dropped. The third, the cart dropped also. However on the last trial the cart dropped and moved backwards. The cart dropping towards the table was a type of force. Another force was the table pushing up towards the cart. From the experiment it showed us that if we did not jerk the ramp from under the cart it would not have moved because there was no other external forces active.
My hypothesis was correct. The cart did move because of an external force. The cart follows Newton's first law for a body at rest. By doing this experiment I learned how to work together as a group to try and prove a point. I already new that an object would not move unless some type of other force was making it. To improve the experiment I would have put a mass weight in the inside.

English 3

Title: Discrimination against black working women

Author: Union of International Associations

Published: MMVIII Union of International Associations (1907-2008)

url: http://www.diversitas.org/db/x.php?dbcode=pr&id=11562450&sbmt=1&go=e

Summary: This source discusses how black women encounter two types of discrimination: being a woman and being black. It said that they were left to do menial jobs because many are illiterate, and do not have many skills. On top of that they do not recieve benefits and they get paid little. Also, 85% of black women are below the poverty line and 48% are illiterate.

How will this help? Having this information will give me a little more insight on how black women are being discriminated in this society.