Newton's Second Law Practical Report

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Prac Report

Problem: How does the increase mass affect acceleration and the force of the accelerating object? Purpose: The purpose of the practical is to find how mass affects acceleration and how it affects also the force of the accelerating body. To do this we are going to do the ticker tape experiment where an accelerating body pulls a tape through a consistent 50 dot per second ticker timer. The acceleration body in this experiment will be a small trolley pulled by a string that is pulled by the downfall of different masses which will then tell how mass affects acceleration. Hypothesis: As the Mass increase so will the force.

Variables:
Independent Variable – The amount of mass tied at the end of the string Dependent Variable – Force (worked out by acceleration)
Controlled Variable – Same amount of air resistant (stay in the same room), same surface of what the trolley is going to accelerate on, same trolley, have the string equally stretched out every time and same tick rate of the ticker timer. The controlled variable will be controlled to create a fair test. Apparatus:

* Power Pack
* Ticker Timer
* Ticker Tape
* Trolley
* 1 meter string
* Pulley wheel
* 50 gram weights x10
* Ruler
* Calculator (recommended)
* Sticky tape

Method:
To be done on bench
1. Plug the power pack into a power source.
2. Attach the power pack to the ticker timer, by attaching 1 plug from the black (negative) output of the power pack to one of the power input of the ticker timer and have the other power input of the ticker timer attached to the red output (positive) of the power pack 3. Have the power pad at 2 voltage

4. Switch the power source and the power pack on
5. Adjust the ticker timer to have roughly around 50 ticks per second (estimate) 6. Switch power pad off
7. Set up the pulley wheel at the opposite end of the table from the ticker timer (preferably 1 meter apart) 8. Thread a ticker tape through the ticker timer (make sure it’s under the carbon paper) and stick the tape onto a trolley. 9. Tie weights onto the end of the string and use the other end of the string to tie to the trolley with the trolley’s angle facing the pulley wheel 10. Start the weight at 10x 50 gram (500 grams)

11. Have the string stretch and on top of the pulley wheel 12. Switch power pad on and instantly release the weight so it accelerates toward the ground (make sure to catch the trolley as it is pulled toward the edge of the table) 13. Take off the ticker tape from the trolley and out of the ticker timer 14. Record results in a Table shown below after switching off the power pad. Mass (Grams)| | Initial Distance (cm)| Initial Speed (cm/s)| Final Distance (cm)| Final Speed (cm/s)| Acceleration (cm/s^2)| Force(N)| 500| Trial 1| | | | | | |

| Trial 2| | | | | | |
| Trial 3| | | | | | |
| Average| | | | | | |
200| Trial 1| | | | | | |
| Trial 2| | | | | | |
| Trial 3| | | | | | |
| Average| | | | | | |
100| Trial 1| | | | | | |
| Trial 2| | | | | | |
| Trial 3| | | | | | |
| Average| | | | | | |
50| Trial 1| | | | | | |
| Trial 2| | | | | | |
| Trial 3| | | | | | |
| Average| | | | | | |

Record the initial distance travelled in the first 0.1 seconds by counting the first 5 spaces between each dot starting with the space in between the first and second dot (see example below). 15.

Then record the distance of the last 0.1 seconds covered (0.4 – 0.5 second) by measuring the distance between 21st spaces to the 25th. Then work out the initial 0.1 second and the final 0.1 second’s speed in seconds by multiplying each distance by 10. Then figure and record their acceleration by taking away the initial speed from the final speed then divided by the change in time which is 0.5 seconds. Then...
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