Viscosity is the resistance of a fluid to flow. Both liquids and gases are considered fluids. A viscous fluid has a high viscosity. That is, it does not flow easily. A less viscous fluid flows more easily. Viscosity is analogous to the friction of solid objects. Like friction, viscosity inhibits movement and serves as a mechanism for transforming kinetic energy into thermal energy. Liquids like molasses and motor oil are very viscous. Fluid viscosity varies because the internal structure of fluids also varies. Intermolecular forces play a role in viscosity; stronger attractions between molecules cause them to resist flow. Molecule size is also a factor; longer molecules can become tangled and flow slowly. When a container is tilted to allow flow, the flowing particles transfer energy to the stationary particles. The viscosity of a liquid generally increases with a decrease in temperature. Gases also have a resistance to flow, although gas viscosities are much lower than for liquids.
Student Experiment
Materials – • Lab aprons • Goggles • 3 sealed tubes, labeled A, B, and C • Test tube rack • Ruler • Stopwatch Procedures – A. As a group, examine each test tube. Observe the air bubble in each. Watch it as you tilt each tube. Your tubes contain syrup, baby oil, and water. Predict which tube contains each liquid. B. Measure the height of the liquid in each tube. Record the fluid height in the data table. C. Beginning with Tube A, invert the test tube and measure the time it takes for the air bubble to move from one end to the other through the fluid. Record the time in the data table. D. Repeat this procedure 5 times per tube and record your data. E. Compute the average speed of the bubble in each tube.
Data Table
Tube A Tube B Tube C
Distance
(cm) Time
(s) Speed
(d/t) Distance
(cm) Time
(s) Speed
(d/t) Distance
(cm) Time
(s) Speed
(d/t)
15.6 35 .45 15.4 1.5 10.27 15.6 2.6 6.0
15.6 36 .43 15.4 2 7.7 15.6 3.0 5.2
15.6 35 .45 15.4 2 7.7 15.6 2.8 5.6
15.6 37 .42 15.4 2 7.7 15.6 2.6 6.0
15.6 36 .43 15.4 1.5 10.27 15.6 2.6 6.0
Average Speed .44 Average Speed 8.73 Average Speed 5.76
In this experiment, student groups ran repeated trials (5) and then averaged their data. All BUT ONE statement explains why the students ran five trials. That is
A) The student data is more reliable.
B) Repeated trials ensure the desired results to support a hypothesis.
C) The more times you repeat the experiment, the more valid your results are.
D) The possibility of obtaining inaccurate results due to experimental errors will be less.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

Need asap which of these is an example of a hypothesis? (2 points) a. adults were not interviewed b. the investigation was time consuming c. the source of information was biased d. very few teenagers were interviewed scientists in different parts of the world have conducted experiments to find the speed of light in vacuum. if the results of the experiments are identical, they would most likely be (2 points) a.valid b. biased c. unreliable d. non-observable which of these questions can be answered using science? (2 points) a. what is the best career? b. does water exist on venus? c. should the use of automobiles be stopped? d. which is the most interesting subject to study? the models can be best used to (2 points) recreate something which is easily observed in nature prove that all atomic theories have the same meaning demonstrate the transformation of atomic theory into law represent the locations of subatomic particles in different atomic theories 22. (bws.06) scientists earlier believed that the lowest measurable temperature is the freezing point of ice. however, modern scientists believe that temperatures below the freezing point of ice can also exist. what best accounts for these different opinions? (2 points) scientists propose contradictory ideas to include all possibilities scientists come up with different hypotheses without enough evidence scientists propose different ideas to avoid repetition of scientific knowledge scientists having different interests may interpret the same data in different ways based on the graph, what is the most likely mass of an apple chosen randomly from the basket? (2 points) between 0.10 kg and 0.12 kg between 0.12 kg and 0.14 kg between 0.14 kg and 0.16 kg between 0.16 kg and 0.18 kg a scientist studies a model of a widely accepted theory about the position of planets and sun. the model would most likely the scientist to (2 points) prove that the theory would not change in the future demonstrate how the theory can be changed into a law understand facts which cannot be easily observed prove that all other facts about the universe are incorrect one scientist discovered a new theory on the evolution of the universe. what is the next step for the scientist to take? (2 points) transform the results of the theory into universal laws of nature inform the scientific community so they can verify the results call a press conference to make the discovery popular among people encourage scientists worldwide to find an appropriate application for the results the students' observations are listed below. when an iron nail is taken near the north pole (n) of the bar magnet, it is pulled towards the magnet. when an iron nail is taken near the south pole (s) of the bar magnet, it is pulled towards the magnet. the experiment was repeated by several students using different bar magnets. based on the investigations, which of these theories would the students most likely propose? (2 points) magnets attract iron nails the poles of a magnet attract all materials iron nails are attracted towards all materials iron nails have the same properties as magnets