Physics Lab Report – What Keeps a Stopper Moving in a Circle Essay Sample

9 September 2017

Hypothesis: I predict that the speed of the stopper will increase as the radius is shortened.

Rubber stopper with a hole
PVC tubing or wooden bobbin

1. Measure the mass f the stopper and washer. m. and record it in the informations and observations subdivision. Then. fix the experimental setup as shown in figure A. 2. Throughout this experiment. you will necessitate to keep a changeless radius of unvarying round gesture while guaranting that all of the centripetal force is provided by the clinch and measured on the spring graduated table. Practice twirling the stopper in a horizontal plane until you can maintain the paper clip a short distance merely below the underside of the tubing. If the paper cartridge holder touches the underside of the tubing. so the clinch is no longer providing the centripetal force. If the paper clips rises or falls appreciably as the stopper commotion so the radius of the circle is altering.

B. Changeless Radius and Variable Speed

3. With the paper cartridge holder against the tubing and the twine pulled taut. step the length of the twine from the top of the tubing to the stopper. Record this as the radius. r. for all three informations tallies in 4. Twirl the stopper while keeping a changeless force reading on the graduated table. Once you obtain a changeless force. get down the halt ticker and go on the gyration while supervising the force. Stop the stop watch after 30 rpm.

5. Record your force and clip in informations table 1. informations run 1.
6. Increase the rate of twirling while keeping the cartridge holder merely below the underside of the tubing. and detect what happens to the tenseness measured by the spring graduated table. It should increase. Repeat measure 4 T this higher spring force.

7. Record your force and clip in informations table 1. informations run 1.
8. Repeat measure 6 and enter the informations in table 1. informations run 2.

C. Contact force and Variable Radius

9. Change the place of the paper cartridge holder to diminish the radius unvarying round gesture for the stopper. Try to acquire as little a radius as you can and still be able to keep a changeless force. 10. Twirl the stopper while keeping a changeless force on the graduated table. Get down the halt ticker and go on the gyration while supervising the force. Stop the stop watch after 30 rpm. 11. Record your force and clip in informations table 2. informations run 1. With the paper cartridge holder against the underside of the tubing and the twine pulled taut. step the length of the twine from the top of the tubing to the stopper. Record this as the radius. r. in table 2. informations run 1. 12. Change the place of the paper cartridge holder to increase the radius unvarying round gesture for the stopper. Repeat measure 10 at the same spring force as informations run 1. 13. Record your force and clip in informations table 2. informations run 1. With the paper cartridge holder against the underside of the tubing and the twine pulled taut. step the length of the twine from the top of the tubing to the stopper. Record this as the radius. r. in table 2. informations run 2. 14. Repeat measure 12 step the length of the twine from the top of the tubing to the stopper. Record this as the radius. r. in table 2. informations run 2.

Number of
Revolutions per minute
N
30
30
30




Table 1
Time
T ( s )

14 s
11 s
8s

Radius
R ( m )

0. 3 m
0. 3m
0. 3m

Number of
Revolutions per minute

30
30
30

Table 2
Time
T ( s )

8. 94 s
12 s
14 s

Radius
R ( m )

0. 1 m
0. 2 m
0. 3 m

1. What does your informations show about the relationship between centripetal force and alteration in velocity at a changeless radius of round gesture?
1. As the velocity increases the centripetal force besides increases. 2. What do your informations show about the relationship between radius of round gesture and alteration in velocity at a changeless centripetal force?

2. As the radius additions so does the velocity of the stopper. 3. Analysis the ensuing secret plan. Is at that place a form? If so what does the form mean?

4. Formulate an equation for the relationship between the spring force and the centripetal acceleration of the stopper. What does this equation state you about the spring force? This shows that the spring force is in direct

relation to the centripetal force.
5. Justify the method of entering clip for 30 rpm to minimise the mistake associated with ciphering the velocity of the stopper. In other labs you have used multiple informations tallies and averaged the informations to minimise the random mistake associated with measurement. Why did you non hold to make that on 5. To acquire the most accurate clip we had the individual clocking besides count the revolutions of the stopper. And we didn’t have to make multiple informations tallies because the clip is the least of import

In this lab we found that the variables of round gesture are straight related. We accomplished our end which was to associate the variables involved in unvarying round gesture. I besides proved my hypothesis incorrect. my hypothesis was that the speed of the stopper will increase as the radius is shortened. which in fact as the radius was shortened the speed decreased. In this lab there were several beginnings of mistake. the stopper was whirling so fast we may hold girls counted how many revolutions it had. and the force was non changeless the full clip.

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