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The extension of a rubber band depends on the force applied

Today you will study the elastic properties of a spring and two different types of rubber band. Your problem today is to determine the relationship between the force needed to stretch an elastic body and the length it stretches. For your hypothesis try to predict the type of behavior you expect the spring and rubber band to follow as you change the amount of force (mass weights) applied to the spring. For example, would you expect if you double the weight the spring will stretch twice as much? Or three times? What type of relationship do you predict will occur?

NOTE: DO NOT BEGIN YOUR EXPERIMENT UNTIL EACH PERSON IN THE GROUP HAS READ THE BACKGROUND AND ANSWERED THE BACKGROUND QUESTIONS.Background and Inquiry: Today you will study some properties of elastic bodies. An elastic body has the ability to regain its original form after it is stretched. A spring is one example of an elastic body. Observe the properties of the spring by pulling slowly on the spring and observe the tension in the spring. DO NOT PULL THE SPRING TO FULL EXTENSION!! If an elastic body is stretched beyond a point called the elastic limit, it will no longer retain its original properties. By feeling the tension on the spring discuss with your group how changes in force may the affect the amount of stretch observed. Many things in nature have elastic properties. A rubber band is one example. A spring is another. Can you think of others? Discuss with your group several other examples of elastic bodies. Take the rubber band and stretch it being careful not to extend it too far. Have each person in the group observe the properties of the two elastic bodies (spring and rubber band). Discuss any differences in their properties. Today you will study the elastic properties of a spring and two different types of rubber band. Your problem today is to determine the relationship between the force needed to stretch an elastic body and the length it stretches. For your hypothesis try to predict the type of behavior you expect the spring and rubber band to follow as you change the amount of force (mass weights) applied to the spring. For example, would you expect if you double the weight the spring will stretch twice as much? Or three times? What type of relationship do you predict will occur? Background Questions:1) What is an elastic body?
2) Give 4 examples of elastic bodies.
3) Do you think the elastic properties of all elastic bodies are the same? Why?
1) Copy Table I, Table II, and Table III into your lab notebook.
2) Set up the equipment as shown in in class. 3) Starting with the smallest mass, measure the amount the spring is stretched (difference in length between spring without mass and with mass). See your class notes on how to measure this difference. Use additional masses as shown in Table I below. For each mass measure the the stretch. DO NOT EXCEED 500 GRAMS FOR THE SPRING. 3) Repeat step 3 using the rubber bands, instead of the spring.Results: To simplify this lab we will only use mass in your tables and graph. See your class notes for clarification.TABLE I

An infrequent, puzzling phenomenon is the litter in which many, if …

At the APA conference in Sydney during October 2009, Dr Helene Longevin presented her research into the effects of stretching subcutaneous tissue. Superficial and deep fascia are composed of loose and dense connective tissue layers. The loose layers allow dense layers to glide past one another. This tissue contains abundant fibroblasts, immune cells and neurovascular bundles. A 20% static stretch of loose connective tissue for 30minutes significantly increases the size of fibroblasts in vivo and in vitro. Although this mechanism remains unclear it is hypothesised to be due to microtubule reorganisation (Beta-tubulin). Inhibition of growth kinase and Roc prevents the cells from spreading out. Actine polymerisation occurs at the leading edge. Fibro-attraction occurs whereby fibroblasts push forward at it's front edge, whilst retracting the rear (through Rho). Both Rac and Rho are activated simultaneously. The fibroblasts microtubule assembly contributes to connective tissue (C.T) relaxation, which means that tense in connective tissue is actively regulated. Viscoelastic response of loose connective tissue is influenced by specific cytoskeletal inhibitors. Rac increases the equilibrium force. Active C.T tensioin regulation may occur normally in response to sustained chnages in tissue length (e.g. hift in body position). This role may be to prevent sustained mechanical stimulation of other cells within the C.T (immune cells, nerve fibres, blood vessels).

NOTE: DO NOT BEGIN YOUR EXPERIMENT UNTIL EACH PERSON IN THE GROUP HAS READ THE BACKGROUND AND ANSWERED THE BACKGROUND QUESTIONS.Background and Inquiry: Today you will study some properties of elastic bodies. An elastic body has the ability to regain its original form after it is stretched. A spring is one example of an elastic body. Observe the properties of the spring by pulling slowly on the spring and observe the tension in the spring. DO NOT PULL THE SPRING TO FULL EXTENSION!! If an elastic body is stretched beyond a point called the elastic limit, it will no longer retain its original properties. By feeling the tension on the spring discuss with your group how changes in force may the affect the amount of stretch observed. Many things in nature have elastic properties. A rubber band is one example. A spring is another. Can you think of others? Discuss with your group several other examples of elastic bodies. Take the rubber band and stretch it being careful not to extend it too far. Have each person in the group observe the properties of the two elastic bodies (spring and rubber band). Discuss any differences in their properties. Today you will study the elastic properties of a spring and two different types of rubber band. Your problem today is to determine the relationship between the force needed to stretch an elastic body and the length it stretches. For your hypothesis try to predict the type of behavior you expect the spring and rubber band to follow as you change the amount of force (mass weights) applied to the spring. For example, would you expect if you double the weight the spring will stretch twice as much? Or three times? What type of relationship do you predict will occur? Background Questions:1) What is an elastic body?
2) Give 4 examples of elastic bodies.
3) Do you think the elastic properties of all elastic bodies are the same? Why?
1) Copy Table I, Table II, and Table III into your lab notebook.
2) Set up the equipment as shown in in class. 3) Starting with the smallest mass, measure the amount the spring is stretched (difference in length between spring without mass and with mass). See your class notes on how to measure this difference. Use additional masses as shown in Table I below. For each mass measure the the stretch. DO NOT EXCEED 500 GRAMS FOR THE SPRING. 3) Repeat step 3 using the rubber bands, instead of the spring.Results: To simplify this lab we will only use mass in your tables and graph. See your class notes for clarification.TABLE I TABLE II TABLE IIIGraph the data from Table I and Table II drawing two graphs, both on the same set of axis. Plot stretch (cm.) on the y-axis and mass (grams) on the x-axis. Make sure to label each axis, and each plot. Measure and record the slope of each plot Give the completed set of graphs a title. Discussion: Be sure to include the following:
1) What type of mathematical relationship is demonstrated in Graph I? Why?
2) Does graph II and III show more than one relationship? For example, does the graph start off linear then change? If so explain why.
3) What are the variables in this experiment? Which is the dependent variable, which is the independent variable?
4) How are the variables changing with relationship to each other?
5) What are some factors that are held constant in this experiment?
6) Can you predict what the stretch would be in Table I if 350 grams were attached to the spring? Why?
7) Can you predict what the stretch would be in Table I if 800 grams were attached? Why? or Why not?Applications: 1) How can your graph be used to find the force of an unknown object?
2) Design an experiment to predict if a spring has been over-stretched and is deformed.
3) Research Hooke's Law. How does it relate to this lab?

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