Phonograph strip

 This is a phonograph strip. When you press your thumbnail to the ridges and pull, the thumbnail vibrates, and you can hear the message that was recorded on the strip.

Ballistic Cart Accessory

 Using a @pascoscientific ballistic cart accessory to show that the ball will go back into the cart if the cart is moving at a constant velocity. A lot of fun doing this in class.

If a ball is fired vertically while the cart is moving at a constant velocity, the ball will follow a parabolic trajectory due to the combined effects of gravity and the cart's motion. The path of the ball will be affected by the initial speed at which it was fired, as well as the acceleration due to gravity and the velocity of the cart.

If the ball is fired with a high enough initial speed, it may reach a height greater than the cart's height. In this case, the ball will follow a parabolic trajectory that takes it above the cart, and it will eventually fall back down to the cart due to the force of gravity. If the ball is fired with a lower initial speed, it may not be able to reach a height greater than the cart, and it may simply follow a curved path back into the cart.

It's also worth noting that if the cart is moving at a constant velocity, the ball will experience a constant horizontal acceleration due to the motion of the cart. This means that the ball will constantly accelerate horizontally while in the air, which can affect the shape of its trajectory.

Planning a Maths Answer

I can't do it - I don't know where to start - It's too hard. Making a plan to solve the problem is the best solution. Giving the students tens of problems to solve but just getting them to plan how they would answer the problem seems to be working.

Here are some general techniques for solving math problems:

Read the problem carefully and ensure you understand what you are being asked to do. Try rephrasing the problem in your own words.

Identify the given information and the unknown quantity that you need to find.

Determine a plan of action. What operations do you need to perform to solve the problem?

Carry out your plan and solve the problem.

Check your work to make sure that your solution is reasonable and correct.

Read the problem carefully and ensure you understand what you are being asked to do. Try rephrasing the problem in your own words, breaking it down into smaller pieces or asking for help from a fellow student, teacher, or tutor.

Le Chatelier's principle Lesson Plan

 Le Chatelier's principle is a principle in chemistry and physics that helps to predict the effect of a change in conditions on a chemical or physical system that is in equilibrium. The principle is named after the French chemist Henry Louis Le Chatelier, who formulated it in the late 19th century. It states that if a system that is in equilibrium is subjected to a change in one of its variables (such as temperature, pressure, or concentration), the system will shift in a way that tends to counteract the effect of the change in an attempt to restore equilibrium. This principle can be used to understand and predict the behaviour of a wide range of chemical and physical systems, including reactions in chemical systems, phase transitions in materials, and even the behaviour of gases in containers.

Demo Pressure in Co2 in water changing using @PascoScientific Pressure Sensor

1. Introduction: Begin by explaining that Le Chatelier's principle is a useful tool for understanding and predicting the behaviour of chemical and physical systems that are in equilibrium.

2. Definition and explanation: Define Le Chatelier's principle and explain how it works. Use examples to help students understand the concept.

3. Practice: Have students work through a series of problems that require them to apply Le Chatelier's principle. For example, they might be asked to predict the effect of a change in temperature on a chemical reaction that is in equilibrium. Such an experiment is the change in colour of Cobalt Chloride in acid in both hot and cold water and demonstrates the change in colour.

1. Group activity: Divide the class into small groups and have each group choose a real-world scenario (such as the dissolution of salt in water or the dissociation of hydrogen and oxygen gases) and use Le Chatelier's principle to predict the effect of a change in one of the variables on the system.

2. Discussion: Have the groups present their findings to the class and discuss any differences or similarities between the scenarios.

3. Review and assessment: Review the key points of Le Chatelier's principle and have students complete a quiz or test to assess their understanding of the concept.

4. Extension: If time allows, have students research and report on a real-world application of Le Chatelier's principle, such as its use in the petroleum industry or in the design of chemical plants.

Le Chatelier's principle helps to predict the effect of a change in conditions on a chemical or physical system that is in equilibrium. Using the

@PascoScientific pressure sensor and CO2 in water, the equilibrium can be watched and changed. Lesson Plan http://bit.ly/3Z5fQfy

Hans Geiger and Ernest Marsden Scattering Experiment

 Hans Geiger and Ernest Marsden were two of the pioneers in the field of atomic physics. Their work on the scattering of alpha particles by a thin gold foil, which was conducted in 1909 under the supervision of physicist Ernest Rutherford, played a crucial role in the development of the modern theory of the structure of the atom.

Geiger and Marsden's experiment involved shooting a beam of alpha particles (positively charged particles consisting of two protons and two neutrons) at a thin gold foil. They expected the alpha particles to pass straight through the foil, but to their surprise, some of the particles were scattered at large angles. This result indicated that there must be a dense, positively charged nucleus at the centre of the atom, surrounded by electrons.

Lord Ernest Rutherford used these results to develop his famous model of the atom, in which the nucleus is depicted as a small, dense, positively charged core surrounded by a cloud of electrons. This model, which is now known as the Rutherford Nuclear model, was a major advancement in our understanding of the structure of matter and laid the foundation for much of the research in atomic physics that has taken place since.

Youngs Modulus

 One of the hardest parts of working out Youngs Modulus is working out how to read a vernier scale correctly. Needed for the thickness of the wires and the change in length.

Objective:

• To measure the Young's modulus of a piece of wire using a tensile test.

Materials:

• Piece of wire
• Tensile testing machine
• Ruler or caliper for measuring the length and diameter of the wire
• Graph paper

Procedure:

1. Cut a piece of wire to a specific length (e.g., 20 cm) and measure its diameter using a ruler or caliper. Record the length and diameter in a data table.

2. Attach the wire to the tensile testing machine and set it to apply a tensile force at a constant rate.

3. Measure the deformation (e.g., elongation) of the wire as the tensile force is applied. Record the stress (i.e., the applied force divided by the initial cross-sectional area of the wire) and strain (i.e., the deformation divided by the initial length of the wire) in the data table.

4. Repeat the tensile test at least three times with different loads (e.g., 50 N, 100 N, 150 N).

5. Plot the stress versus strain on a graph using graph paper.

6. Determine the slope of the linear portion of the curve, which is the Young's modulus of the wire.

7. Calculate the average Young's modulus of the wire based on the results of the multiple tests.

Discussion:

• Discuss the importance of Young's modulus in engineering applications.
• Compare the Young's modulus of the wire with that of other materials (e.g., steel, aluminum, wood).
• Discuss factors that may affect the Young's modulus of a material, such as temperature and humidity.

Assessment:

• Have students write a lab report summarizing the procedure, results, and discussion of the experiment.
• Have students present their findings in a class discussion or presentation.
• Have students answer questions about the experiment and the concept of Young's modulus in a quiz or exam.
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• Young's modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material. It is defined as the ratio of the applied stress to the corresponding strain in the material. Young's modulus is a measure of the stiffness of an object, and is calculated by dividing the applied stress by the resulting strain. It is typically measured in units of pascals (Pa) or gigapascals (GPa). The higher the Young's modulus, the stiffer the material is. Some common materials and their Young's moduli are:

  • Steel: 200 GPa
  • Aluminum: 70 GPa
  • Concrete: 25 GPa
  • Wood: 12 GPa
  • Rubber: 0.01 GPa

Models and real things

The model lungs show us how the lungs work, but they are only a model and no substitute for looking at the real thing. Investigating the diaphragm and inflating the lungs of a sheep. The lungs are a pair of spongy, air-filled organs that are located on either side of the chest (thorax). The trachea (windpipe) carries air from the mouth and nose into the lungs through a series of tubes called bronchi. The bronchi branch off into smaller and smaller tubes called bronchioles, which end in clusters of tiny round air sacs called alveoli.

When you inhale, the diaphragm (a muscle located at the base of the lungs) contracts and moves downward, creating more space in the chest cavity. This increases the volume of the chest cavity and decreases the pressure inside it. As a result, air is drawn into the lungs through the trachea, bronchi, and bronchioles.

The air that enters the lungs is warm and moistened by the nose and tubes. It then passes through the alveoli, where oxygen and carbon dioxide exchange occurs. Oxygen from the air diffuses across the thin walls of the alveoli and into the blood vessels called capillaries that surround them. At the same time, carbon dioxide, a waste product of the body's cells, diffuses from the blood into the alveoli to be exhaled.

When you exhale, the diaphragm relaxes and moves upward, decreasing the volume of the chest cavity and increasing the pressure inside it. This forces the air out of the lungs through the trachea, bronchi, and bronchioles.

The lungs are essential for breathing and play a vital role in the body's respiratory system. They help to oxygenate the blood and remove waste products, such as carbon dioxide, from the body.