PHYSICS ESSAYS

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Defining the problem and selecting variables Problem: How does a change in the length of the radius affect the velocity of the stopper? Research: Circular motion can be expressed in terms of formulas as it directly links to Newton?s 2nd law, f=ma. Fc = m*a This relates to circular motion as in circular motion: v2 Ac =r Because f= m*a We can say that: v2 Fc = mr V = rev / s ? 2nr T ( period) =1 / ƒ Frequency = number of revolutions per second Variables Independent variable(s) (manipulated): Radius Dependent variable(s) (measured): Velocity Controlled variable(s) (constant): Human Error Friction Air resistance Technology Aspect 2 − Controlling variables The variables were controlled in the following ways: Independent: Radius- during the Experiment that we conducted our independent variable that we controlled was the radius

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Teacher’s Instruction: To study how the difference in mass affects the Time Period of a spring pendulum. Research Question: How does the suspended mass affect the Time period of an oscillation of a spring? Variables Independent Variable: Mass Suspended (m) Dependent Variable: Time Period (T) Control Variable: Number of Oscillations (n) Dimensions of the Spring A Clamp Stand A G- Clamp A Spring Weights to be suspended A Digital Stop Watch A digital balance The clamp stand is set up and held steady to the table top using a G- Clamp

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Aim: To investigate Hooke’s law for simple springs of rubber Hypothesis: The relationship between a load force and a light spring (F=k.x) was first determined by Robert Hooke in the 17th century

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Gamma rays refer to the high energy photons that are emitted by radioactive nuclei. They are a form of electromagnetic radiation, just like visible light or x rays, but with a much higher energy

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Aim: To find the radius of curvature and the focal length of a converging lens by experimental method Hypothesis: The relationship between u, v, and the focal length f for a converging lens is = l = l + lf u v where f is the focal length of the lens, u is the distance between the object to the lens and v is distance between the images to the lens. Variables: Independent Controlled Dependent Different types of lens used Distance between the candle and the lens Experiment conducted at a dark room Same projection screen used Focal length of the lens and the distance between the image and the lens Materials: Item Quantity Accuracy Candle & Matches 1 - Converging lenses 5 - Screen 1 - Distance marker 1 6l ±0

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Fiber optics (optical fibers) are long, thin strands of very pure glass about the diameter of a human hair. They are arranged in bundles called optical cables and used to transmit light signals over long distances

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Aim: Determine the mass of a metal mass using the principles of horizontal circular motion. Experimental Design: A stopper that is attached to a vertical mass will be swung in horizontal circular motion using a specially set up apparatus

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Aim The aim of this experiment is to find how the amount of stretching, when shooting a rubber band, affects the length of the shot. Hypothesis When you stretch an elastic rubber band, you store potential elastic energy inside it

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Fiber optics (optical fibers) are long, thin strands of very pure glass about the diameter of a human hair. They are arranged in bundles called optical cables and used to transmit light signals over long distances

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Aim To observe the energy produced per second depending on the rate of cooling from the objects depending upon the relative ability of its surface to emit energy by radiation of heat. Hypothesis The black body has an emissivity of 1 whereas the silver body has an emissivity of 0