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High School

Friction on a Turntable

Submitted by PocketLab on Fri, 06/02/2017 - 18:56

Exploration

An inertial force arises from the rotation of the object and the object mass (sometimes called the centrifugal force, not to be confused with centripetal force). If the inertial force is greater than the force of friction, the object will slide off of the rotating turntable (following Newton’s First Law of Motion). The parameters that cause the inertial force to be greater than the force of friction depend on many variables.

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Understanding Centripetal Force

Submitted by PocketLab on Fri, 06/02/2017 - 18:46

Exploration

An object experiencing a constant net force will experience a constant acceleration. Acceleration is defined as either a change in speed or a change in direction. When an object moves along a curved path it may maintain its speed, however it will be constantly changing its direction of movement. This type of acceleration along a curved path is called centripetal acceleration and is the result of a centripetal force, a force that is directed inward, toward the center of the curvature of the path. Examine the figure below.

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Soup Can Race

Submitted by PocketLab on Fri, 06/02/2017 - 18:39

Exploration

When two cans of different geometries are released from rest at the same time at the top of an inclined plane the results of the race may not be what you predict. The moment of inertia of each soup can will affect whether it reaches the end of the inclined plane first.

Objective

In this experiment, students will:
1. Determine the order in which each can will reach the bottom of the ramp first and explain why in terms of the energy in the system and the moment of inertia in each can.

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Measuring Forced Vital Capacity with PocketLab Spirometer

Submitted by PocketLab on Fri, 06/02/2017 - 16:53

Exploration

A spirometer is an apparatus often used in the medical field to find the cause of shortness of breath. A spirometer can rule out lung diseases like asthma, bronchitis, and emphysema. A spirometer can measure forced vital capacity. Forced vital capacity is the amount of air exhaled during a forced breath. Explore what factors affect forced vital capacity.

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Natural Frequency of a Mass-Spring System

Submitted by PocketLab on Fri, 06/02/2017 - 16:41

Exploration

Explore principles of harmonic motion. An oscillating mass on a spring or the motion of a simple pendulum are examples of objects in simple harmonic motion. When an object is in simple harmonic motion, the restoring force is directly proportional to the displacement and will act in opposition to that displacement, allowing the object to oscillate back and forth.

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Properties of a Wave with Simple Harmonic Motion

Submitted by PocketLab on Thu, 06/01/2017 - 19:41

Exploration

Simple Harmonic Motion is a periodic or oscillating motion where the forces of the movement cause a particular motion to continually repeat. The back and forth of a pendulum, like in an old grandfather clock, the ticking of a classic metronome, or the up and down movement a bungee jumper can all be examples of harmonic motion.
Using PocketLab you can investigate how to mathematically model harmonic motion through two classic examples, a swinging pendulum and a mass-spring system.

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Introduction to Free Falling Objects

Submitted by PocketLab on Thu, 06/01/2017 - 19:15

Exploration

Galileo Galilei is often considered one of the founders of modern science. This is because he investigated questions through experimentation and observations. One of his most famous experiments involved dropping cannonballs of different mass to determine whether they would accelerate to the ground at different rates.

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Understanding Newton's Laws with Atwood's Machine

Submitted by PocketLab on Thu, 06/01/2017 - 18:37

Exploration

Acceleration of an object is dependent upon two variables – the net force acting on the object and the mass of the object. Using a Full-Atwood’s Machine you will explore the relationship between these variables to understand Newton’s Second Law of Motion.

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Crash Cushion Investigation

Submitted by PocketLab on Thu, 06/01/2017 - 18:01

Exploration:

Nearly 1.3 million people die from car accidents worldwide each year, according to the World Health Organization. In order to reduce traffic fatalities high-speed roadways must be made safer. Building crash cushions along highways that reduce the impact force experienced by the passengers of the car in a crash can save lives. But how should these cushions be built?