The eye is one of the many marvels of the human body. The colored iris of the eye, surrounding the pupil, acts as a diaphragm to keep the amount of light entering the eye fairly constant. If you walk out the door of your house to a sunny yard, the iris opening gets smaller letting less light into your eye. If you enter a dark room after watching your favorite television program, the iris gets larger to allow more light to enter your eye. This is a protective reflex, as too much light could damage the retina, which is where the image forms in the eye, similar to the film of a traditional
This lesson provides a challenge that incorporates all eight of the Next Generation Science Standards (NGSS) science and engineering practices. Although this lesson makes use of both Ozobot and Voyager, neither of these is required, as all data have been collected and are supplied. Students match several geometric shapes with their corresponding angular velocity vs. time data obtained as Voyager/Ozobot travel around the shapes. Students are also provided with angular momentum data from an unknown geometric shape and asked to sketch the shape from their analysis.
Ozobot “Evo” (ozobot.com) is a tiny one-inch diameter robot that can be quickly programmed using a Google Blockly dialect known as OzoBlockly (ozoblockly.com). This lesson combines the ability to program Ozobot to move freely in a straight line with Voyager’s ability to sense the resulting motion through its range finder. Students compute the slope of the resulting position versus time graph to determine Ozobot’s velocity.
Ozobot “Evo” (ozobot.com) is a tiny one-inch diameter robot that can be quickly programmed using a Google Blockly dialect known as OzoBlockly (ozoblockly.com). Combining the ability to program Ozobot to rotate precisely as desired with Voyager’s ability to sense the resulting motion through its collection of sensors, the possibility of a seemingly endless variety of STEM projects becomes a reality.
In this experiment a coasting cart on a flat surface gradually slows down and stops due to rolling resistance. Two very different surfaces are compared—a carpeted floor and a wood floor. The purpose of this experiment is three-fold: (1) to determine the force of rolling resistance, (2) to determine the coefficient of rolling resistance between the cart the surface on which it rolls, and (3) to gain a practical understanding of the meaning of this coefficient. Voyager's range finder is used to collect data.
An accelerometer is a device that will measure acceleration forces. These forces may be static, like the constant force of gravity pulling us towards the Earth’s surface, or the force may be dynamic, like an object moving or vibrating. This lab will show how to use to accelerometer to measure the static angle of a ramp as it rotates between 0° and 90°.
A unit circle is a circle with a radius of 1, graphed on a Cartesian plane, with the center of the circle at the origin. The relationship between the angle of different radii on the circle and the values of different points on the circle can help in the understanding trigonometric functions.
Barometric pressure is the pressure from the force or weight of air exerted on a surface. The PocketLab’s barometric pressure sensor measures the force of the air molecules that push against the sensor
In this investigation students will:
1. Design a system that uses PocketLab’s barometer and an understanding of ratios and proportions to build a scale.
2. Use the given supplies to find the weight of unknown objects.
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