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# The following assignment requires that you access the following

By Sherry Holmes,2014-04-20 19:32
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The following assignment requires that you access the following

Hanna - Physics

Freefall

The following assignment requires that you access the following website: http://www3.interscience.wiley.com:8100/legacy/college/halliday/0471320005/simulations6e/index.htm

Choose the Freefall simulation from the menu bar.

Equations:

d is vertical displacement, dis initial vertical displacement, v and vare initial 0 0f

and final velocity, t is time and a is acceleration.

12 ；;vvat*datvtd；;;***f0002

changeinvelocityv acceleration；？；achangeintimet

Instructions:

This simulation models a ball thrown up or down with varying speeds. In addition the ball can be thrown from various heights. In order to perform calculations, the value of the acceleration is needed. This can be found by determining the slope of the velocity versus time graph.

Case 1:

Run the simulation with the default settings. Without clearing the trace, change the initial position to 2m and rerun the simulation.

Which, if any, of the graphs changed?

Choose a different initial position and rerun the simulation.

What conclusion can you make about the velocity versus time graph as the initial position changes?

Case 2:

Reset the initial position to 0m, but change the initial velocity to 10m/s and run the simulation.

How much does the velocity change in 1s? Is the change positive or negative?

Calculate the value of the acceleration being used in the simulation by determining the slope of the velocity versus time graph. Use the change in velocity and change in time you just found.

v2 m/s a；；t

Without clearing the trace, use a new value for the initial velocity and rerun the simulation. What conclusion can you draw from the slope of the velocity versus time graph?

Hanna - Physics

Freefall

Case 3:

Reset the initial position to 0m and the initial velocity to 10m/s and run the simulation. Approximately how long does it take the ball to reach its maximum height?

Time = s

What is the velocity of the ball at this point?

Velocity = m/s

What is the acceleration of the ball (the slope of the velocity-time graph) at this point?

2 Acceleration = m/s

After the ball is released, regardless of the initial position or initial velocity, does the acceleration change?

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