## Physlet® Physics Newton's Laws Illustrations JS Package Documents

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#### Main Document

##### Physlet® Physics Newton's Laws Illustrations Package

written by Wolfgang Christian, Mario Belloni, and Jack Taylor

The Physlet® Physics Newton's Laws Illustrations Package contains JavaScript adaptations of Physlet Illustrations from Physlet Physics Chapter 4.  In this package we explain why objects move or do not move using the concept of force.  Students need to interact with the Physlet, but the answers to the questions posed in the Illustration are given or are easily determined from interacting with it. Some Illustrations provide examples of physics applications while others are designed to introduce a particular kinematics concept. Typical uses of Illustrations would include reading assignments prior to class and classroom demonstrations.

The Physlet® Physics Newton's Laws Illustrations Package was developed using the Easy Java/JavaScript Simulations (EjsS) version 5.  Although EjsS is a Java program, it can create stand-alone JavaScript programs that run in almost any PC or tablet.

Published January 22, 2017

#### Supplemental Documents (6)

##### Newton's First Law and Frames of Reference

A ball popper on a cart (not shown to scale) is shown moving on a track in three different animations. In each animation the ball is ejected straight up by the popper mechanism at t = 1 s.  What would the motion of this ball and cart look like in different reference frames?

##### Ill 4.2: Free-Body Diagrams

This illustration demonstrates how we analyze the motion of an object using forces.  We draw a picture that shows only the object and the direction of the forces known as a free-body diagram. This Illustration analyzes the forces on a block in the x direction and then the forces in the y direction as it is pushed by an external force.

##### Ill 4.3: Newton's Second Law and Force

A force is a push, a pull, or any other interaction, exerted by one object on another object. In this Illustration the user interacts with a 1.0-kg cart and observes the motion.  Velocity and acceleration graphs are also displayed.

##### Ill 4.4: Mass on an Incline

A mass is on a frictionless incline as shown in the animation. Users adjust m, the mass of the block (100 grams < m < 500 grams), and ? the angle of the incline (10° < ? < 45°), and view how these changes affect the motion of the mass.