Controlled variables:
1.The lighting was kept constant during the complete test. No additional light sources were added throughout the experiment, nor were any light sources removed throughout the experiment. This minimized the errors involved with trying to read and record the indicated measurements on the ticker tape, as well as the ability to analyze the experiment. 2.The same person measured and recorded the height and length of the incline plane and level horizontal track to ensure consistency in the recording of data. By having the same person read all of the measurements minimized the degree of uncertainty in position and angle of reading values. 3.The same person recorded all measuring values on the ticker tape to ensure consistency in the recording of data. By having the same person read all of the measurements minimized the degree of uncertainty in position and angle of reading values. 4.The spark timer was set to a frequency of 10Hz (10 dots/s). This eliminated the possible random error that could have been associated with the recording of time if a person were to record the time, due to delays in reaction time. By having the consistency of the spark timer record the time values the total accuracy and precision for the experiment was increased. 5.There was no wind or abnormal air movements during the complete test. No doors were opened or closed during the experiment, nor were any windows opened or closed, ensuring that the results would not be affected from air currents pushing or angling the car. Procedure:

1.Using a meter stick, one person measure and record the height of incline plane at its highest point from the table. Then, using a meter stick, one person measure and record the length of the incline plane and the level horizontal track. 2.Without the use of ticker tape or a spark timer, place the car at the top of the incline plane. Release the car. Use this as a trial run to ensure the ramp will produce efficient results. 3....

...What keeps the stopper moving in a circle?
Purpose: Relate the variables involved in uniform circular motion
Hypothesis: I predict that the velocity of the stopper will increase as the radius is shortened.
Rubber stopper with a hole
PVC tube or wooden spool
1. Measure the mass f the stopper and washer, m, and record it in the data and observations
section. Then, prepare the experimental apparatus as shown in figure A.
2. Throughout this experiment, you will need to maintain a constant radius of uniform circular
motion while ensuring that all of the centripetal force is provided by the clamp and measured
on the spring scale. Practice whirling the stopper in a horizontal plane until you can keep the
paper clip a short distance just below the bottom of the tube. If the paper clip touches the
bottom of the tube, then the clamp is no longer supplying the centripetal force. If the paper
clips rises or falls appreciably as the stopper whirls then the radius of the circle is changing.
B. Constant Radius and Variable Speed
3. With the paper clip against the tube and the string pulled taut, measure the length of the string
from the top of the tube to the stopper. Record this as the radius, r, for all three data runs in
4. Whirl the stopper while maintaining a constant force reading on the scale. Once you obtain a
constant force, start the stop watch and continue the whirling while monitoring the...

...
E105: UNIFORM CIRCULAR MOTION
NADONG, Renzo Norien D.
OBJECTIVE
The purpose of this experiment is to quantify the centripetal force on the body when one of the parameters is held constant and to verify the effects of the varying factors involved in circular motion. Mainly, horizontal circular type of motion is considered in this activity.
Circular motion is defined as the movement of an object along the circumference of the circle or the manner of rotating along a circular path. With uniform circular motion it is assured that the object traversing a given path maintains a constant speed at all times. Centripetal force is a force that tends to deflect an object moving in a straight path and compels it to move in a circular path.
MATERIALS AND METHODS
This experiment was divided into three parts in order to further study and observe the factors that affect the centripetal force of a body. The concept of this experiment is the same on all parts, which is getting the centripetal force given with three different conditions. Every part of the experiment was executed just the same. Mass hanger plus a desired mass of weights were hanged over the clamp on pulley to determine a constant centripetal force which will act as the actual value. But on the third part of this experiment, aside from the centripetal force, it is also asked to determine the mass of the rotating body....

...Name: Soroush Shabani Lab Partners:sepand
Investigating Uniform Circular Motion
TI
/14
Data Processing
Data is processed accurately with sample calculations shown (f calculations, error propagation, log-log analysis )
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Graphs are accurate and show appropriate proportional analysis
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Results were compared to theory using the equation -
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Conclusion and Evaluation
States a conclusion, with justification, based on a reasonable interpretation of the data. Reference is made to the quantitative result as well as graphical trends to support the conclusion
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Evaluates procedural weaknesses and limitations.
Remember – ONE paragraph per error including how the identified error impacts the quantitative relationship and a suggestion on how a realistic improvement can be made so as to minimize the error.
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Comm
/14
Data Presentation
Research Question/Purpose stated with variables stated explicitly
0
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Procedure is written as numbered steps and it explicitly outlines how control variables were controlled and the ranges data was collected over.
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Data is presented appropriately including an account of uncertainties (+/-). Significant figures are kept consistent throughout.
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Data tables are appropriately formatted (titles, headings, units etc.)
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Graphs are...

...Lab II, Problem 3:
Projectile Motion and Velocity
Oct. 06, 2013
Physics 1301W, Professor: Hanany, TA: Vladimir
Abstract
A ball is tossed obliquely. The vectors of position and velocity are measured.
The acceleration is calculated.
Introduction
A toy company is now making an instructional videotape on how to predict the position. Therefore, in order to make the prediction accurate, how the horizontal and vertical components of a ball’s position as it flies through the air should be understood. This experiment is to calculate functions to represent the horizontal and vertical positions of a ball. It does so by measuring and calculating the components of the position and velocity of the ball during the toss. Therefore, we can also calculate the acceleration during the procedure.
Prediction
The x-axis is located on the ground level horizontally, pointing to where the ball is initially thrown, that is opposite the direction the ball flies. The vertical y-axis passes through the highest point of the ball during the fly and point upward.
Since the ball experiences no other force, except for gravity, during the toss. There is no horizontal force. It is predicted that the ball should have a constant horizontal speed, which is the horizontal component of initial velocity. Vertically, it has gravity pulling it down all the time. So it should have an acceleration of –g (minus is for the direction). Since it has a vertical...

...Experiment 1.7: Graphical Analysis of Motion
Introduction
To graphically analyze motion, two graphs are commonly used: Displacement vs. Time and Velocity vs. Time. These two graphs provide significant information about motion including distance/displacement, speed/velocity, and acceleration. The displacement and acceleration of a moving body can be obtained from its Velocity vs. Time graph by respectively finding the area and the slope of the graph.
Data Tables – Part I
Displacement (m) Time (s)
0.10 m 0.37 s
0.20 m 0.586 s
0.30 m 0.761 s
0.40 m 0.907 s
0.50 m 1.041 s
0.60 m 1.147 s
0.70 m 1.263 s
0.80 m 1.351 s
0.90 m 1.439 s
1.00 m 1.597 s
1.10 m 1.646 s
1.20 m 1.779 s
1.30 m 1.956 s
Part II
Main Photogate at __(m) Time (s) Instantaneous Velocity (m/s)
0.30 m 0.098 s 0.41 m/s
0.40 m 0.072 s 0.55 m/s
0.50 m 0.06 s 0.67 m/s
0.60 m 0.053 s 0.75 m/s
0.70 m 0.047 s 0.85 m/s
0.80 m 0.043 s 0.93 m/s
0.90 m 0.042 s 0.95 m/s
1.00 m 0.038 s 1.05 m/s
1.10 m 0.038 s 1.05 m/s
1.20 m 0.041 s 0.98 m/s
1.30 m 0.049 s 0.82 m/s
1.40 m 0.05 s 0.8 m/s
1.50 m 0.055 s 0.72 m/s
Part III
Estimated area
Velocity vs. Time graph
From t=0s to t=0.8s
0.49 m
Slope @ T= 0.8 s
Displacement vs. Time
= 0.6 m/s
Velocity vs. Time
= 0.3 m/s2
(Work shown on graph paper)
Summary Questions
1) Describe the meaning of the slopes of the graphs you obtained in Part...

...REPORT
AIM
The aim of this experiment is to:
□ Explore the equations of uniform accelerated motion and investigate the relationship between displacement and time
□ Determine the magnitude of deceleration due to friction.
□ Assess the effect of mass on the car’s accelerated motion.
DESIGN
Hypothesis – A car moving in a straight line with a non-zero initial velocity will finally come to a rest as a result of friction, given that the car has no engine or external tractions. This motion can be considered as a uniform accelerated motion because:
1. The car is moving in a horizontal straight line so weight is cancelled by the normal reaction force from the ground. The only other force existed is the friction between the car and the surface therefore it will be equal to the net force
2. According to the formula Fr = μN, the amount of the friction depends on two factors: the friction coefficient and the normal reaction force, both of which are fixed. Therefore the amount of friction is constant throughout the motion
3. According to Newton’s Second Law F = ma, a constant net force will result in a uniform acceleration (deceleration). The acceleration is negative in this case as cars are slowing down to a rest.
For convenience, this decelerated motion can be inverted into an equivalent motion in which the car is acceleration...

...Title: Uniform Circular Motion
Objective: To investigate the relationship between FnetT² and radius
Proposed Hypothesis: FnetT² is directly proportional to the radius
Manipulated variable: Radius of the circular motion
Responding variable: The time taken for 20 rotations
Controlled variables: The mass of the rubber stopper, the mass of the weight hanger, the total weight of the slotted weight, the length of the PVC tube
Apparatus and Materials: rubber stopper, stopwatch, weight hanger, slotted weights,
crocodile clip, metre rule, thread, PVC tube
Diagram:
Procedure: 1. Weigh and record the masses of weight hanger and rubber stopper.
2. Tie the thread to the rubber stopper.
3. Pass the thread through the PVC tube.
4. Tie a node at the end of the thread and hang the weight hanger which is with
0.08g slotted weights on it.
5. Measure the 0.1m radius from the bottom of PVC tube and mark it.
6. Zheng Yie starts to rotate the thread with an acceleration until the bottom of
PVC tube is reached the mark.
7. Keep the speed of rotation constant so that the bottom of PVC tube is
always touched the mark.
8. After the speed is kept at constant speed, Adeline starts to studies the time
taken for 20 rotations by using a stopwatch.
9. Adeline is also responsible to record the time taken for 20 rotations.
10. Step 5 until step 9 are repeated by...