physics lab, homework help

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I did a lab for physics and now I need help answering some questions on a worksheet. I have attached the worksheet below. 

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Name Date Class Lab 12: Energy Conversions Purpose To measure the conversion of energy between potential and kinetic using an inclined plane Background Knowing how energy behaves is even more important than knowing what it is. The law of energy conservation states that energy cannot be either created or destroyed. So the energy of a system must remain the same before and after things happen to it. A person walking to the top of a burning building has to work to climb the stairs. The energy from the work is then stored in potential form because of the force of gravity pulling her down. If she were to jump from the burning building onto a fire fighters’ trampoline, her potential energy would be converted into kinetic energy as she was falling. As she speeds up while falling, her potential energy decreases because she is closer to the ground and her kinetic energy increases as her speed increases. When she hits the trampoline she will slow down and her energy will convert into vibrations (elastic potential energy), heat and noise. Skills Focus Making generalizations, interpreting data, applying concepts, drawing conclusions Procedure 1. Start Virtual Physics and select Energy Conversions from the list of assignments. The lab will open in the Mechanics laboratory. 2. The laboratory will be set up with a ramp, a ball on the ramp, and a plunger on the ball. Using the Force button to hit the plunger, you will push the ball up the ramp. The ball will stop at some point and come rolling back down the ramp. 3. You will need to record and use the data from the experiment. Click on the Lab Book to open it. The click the red Recording button. When the Force button is clicked, the data selected with the check marks will be automatically recorded. Energy Conversions ISBN 1-269-73240-4 4. Click the Force button to hit the ball up the ramp. Then watch the ball fall back to the bottom. Energy Conversions 39 Virtual Physics Lab Workbook, by Brian F. Woodfield, Steven Haderlie, Heather J. McKnight, and Bradley D. Moser. Published by Pearson Learning Solutions. Copyright © 2008 by Pearson Education, Inc. Name Date Class 5. Click the link in the lab book that contains your data. You may want to copy and paste it into a spread sheet program. From the data you should find five different locations of the ball and compare the ball’s potential and kinetic energies at those points. First you will find and record the different velocities and the heights at which the ball had those velocities. The beginning was when the ball first got hit. Record the ball’s velocity right after it was hit (the first data point where velocity ≠ 0.) Then find a middle height in the data and record it and the velocity of the ball at that height. Do the same for the top, the middle on the way down, and then the bottom again. Record the information in Data Table 1. Data Table 1 Ball Position Height (m) Velocity (m/s) Beginning bottom Middle going up Top Middle coming down End bottom 6. Now you can calculate the gravitational potential energy and the kinetic energy of the ball at the different positions. Recall that gravitational potential energy is due to the work of lifting the ball against gravity. So you only need to know the height of the ball off the ground y(m). Record your calculations in Data Table 2. Use the equation: PE = mgh where m is mass of ball, g is the acceleration due to gravity, and h is height of ball from ground. 7. Recall that the kinetic energy of an object depends on its mass and the speed or velocity that it is moving. Calculate the kinetic energy using the equation: KE= 1 mv2 2 where m is mass, and v is the velocity of the ball. Data Table 2 Ball Position Potential Energy Kinetic Energy Energy Conversions Starting bottom Middle going up Top Ending bottom 40 Energy Conversions Virtual Physics Lab Workbook, by Brian F. Woodfield, Steven Haderlie, Heather J. McKnight, and Bradley D. Moser. Published by Pearson Learning Solutions. Copyright © 2008 by Pearson Education, Inc. ISBN 1-269-73240-4 Middle coming down Name Date Class Analyze and Conclude 1. Making Generalizations energy? What determines potential energy? Kinetic 2. Interpreting Data Why? When did the ball have the most potential energy? 3. Interpreting Data When did the ball have the most kinetic energy? 4. Applying Concepts What is the relationship between the PE at the top of the ramp, and the KE at the bottom of the ramp? Energy Conversions ISBN 1-269-73240-4 5. Drawing Conclusions Where did the energy go from the top of the ramp to the bottom? Explain the motion of the ball throughout the experiment in terms of potential and kinetic energy. Energy Conversions 41 Virtual Physics Lab Workbook, by Brian F. Woodfield, Steven Haderlie, Heather J. McKnight, and Bradley D. Moser. Published by Pearson Learning Solutions. Copyright © 2008 by Pearson Education, Inc.
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Name

Date

Class

Lab 12: Energy Conversions
Purpose
To measure the conversion of energy between potential and kinetic using an
inclined plane

Background
Knowing how energy behaves is even more important than knowing what it is.
The law of energy conservation states that energy cannot be either created or
destroyed. So the energy of a system must remain the same before and after
things happen to it. A person walking to the top of a burning building has to
work to climb the stairs. The energy from the work is then stored in potential
form because of the force of gravity pulling her down. If she were to jump from
the burning building onto a fire fighters’ trampoline, her potential energy
would be converted into kinetic energy as she was falling. As she speeds up
while falling, her potential energy decreases because she is closer to the ground
and her kinetic energy increases as her speed increases. When she hits the
trampoline she will slow down and her energy will convert into vibrations
(elastic potential energy), heat and noise.

Skills Focus
Making generalizations, interpreting data, applying concepts, drawing
conclusions

Procedure
1. Start Virtual Physics and select Energy Conversions from the list of
assignments. The lab will open in the Mechanics laboratory.
2. The laboratory will be set up with a ramp, a ball on the ramp, and a plunger
on the ball. Using the Force button to hit the plunger, you will push the ball
up the ramp. The ball will stop at some point and come rolling back down
the ramp.
3. You will need to record and use the data from the experiment. Click on the
Lab Book to open it. The click the red Recording button. When the Force button
is clicked, the data selected with the check marks will be automatically
recorded.

Energy Conversions

ISBN 1-269-73240-4

4. Click the Force button to hit the ball up the ramp. Then watch the ball fall
back to the bottom.

Energy Conversions

39

Virtual Physics Lab Workbook, by Brian F. Woodfield, Steven Haderlie, Heather J. McKnight, and Bradley D. Moser. Published by Pearson Learning Solutions.
Copyright © 2008 by Pearson Education, Inc.

Name

Date

Class

5. Click the link in the lab boo...


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