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Background

In this activity you will use vectors to calculate a missing force vector so no motion will occur.

A body is defined as being in equilibrium when is moves at a constant velocity -for now. An easy constant velocity to recognize is zero -a resting body. Each force is a vector and is added.





To apply the forces in a measurable way, we will use a "force table." Below is a photo of a force table. 


Below is a close up of the force table's top.

In this activity you will be using a simulation of the table top. The simulation looks like the one below.

Objective

Given three force vectors, calculate a forth force such that when it is added to the three, all the forces are in equilibrium. (Your final answer can be checked in the simulation.)

Instructions

The link to the simulation is given at the bottom of these instructions. Go to the simulation after reading all these instructions.

As seen above, the simulation will give three random forces. The force vectors are NOT drawn to scale.

Every time the web page containing the simulation is loaded, a new set of three vectors is given. This means you need to get the vectors and complete the task before closing your web browser.

To find the needed fourth vector, use either the component method for adding vectors or make a precise, scaled drawing on graph paper. See your teacher for which method you are to use.

Use the "Angle tool" to calculate any angles. Slide the red circle around the big circle to get an angle reading.

Once your answers are entered into the red box at the bottom, click the green button to check your answer.

When your answer is correct, call the teacher over to show your simulation with the answers to verify that the simulation is correct. Then celebrate! 

The simulation is here: http://www.mrwaynesclass.com/teacher/Vectors/Force_Table

  


by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)

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