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For our website we decided on using a PhEt Simulation.

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MS-PS2-1. Apply Newton’s Third Law to design a solution to a problem involving the motion of two colliding objects

MS-PS2-2. Plan and conduct an investigation to provide evidence that the change in an object’s motion depends on the sum of the forces on the object and the mass of the object

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.A force is an interaction between objects. Many middle school students have the misconception that force is a property of objects. For example, students may believe that when you throw a baseball, the force is transferred to the ball.

When you see a game of tug-of-war, you cannot see the strength and direction of the participants. Using the PhET Simulation students will be able to see the strength and direction of forces being applied to objects and be able to make predictions about the motion of the objects.

The NGSS activity "Crash and Collisions" was a great activity, but this PhET simulation provides students with an opportunity to investigate a change in an objects motion through the use of visual aids and pre-calculated data. This can serve as a modification to the NGSS activity.

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The two forces are of equal strength, but in opposite directions. Just because the two forces are equal, it doesn’t mean that the movements are equal, or that the objects will stop moving.(MS-PS2-1)

Simulation can provide a visual representation of the idea that the amount of momentum in a system is the same before and after the collision. (MS-PS2-2) Forces always occur in pairs.

(MS-PS2-1) (MS-PS2-2)Acceleration is directly proportional to force and inversely proportional to mass. This means that if you get pushed, the harder you are pushed, the faster you’ll move (accelerate)

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Addressing misconception through PhET (Video) 

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Addressing misconception through PhET (Video) 

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As students use the PhET simulation, we want them to first explore the simulation, trying out different combinations of masses, and velocities.
Then they use the simulation to study the collisions:

Two balls of identical mass

Two balls of different mass

Two identical blocks that stick/do not stick together.

For each situation they should draw a diagram indicating the momentum of each ball or block before and after the collision. Then students run the simulation and observe what happens.