3. Today’s Objectives:
• You will calculate how much gravitational and kinetic
energy a ball has while moving in free fall.
• You will apply the law of energy conservation in order to
check for energy lost internally.
4. Conservation of Energy
A baseball is thrown up in the air and then falls back down.
Place velocity vectors beside each corresponding baseball in
the drawing, and draw an energy storage pie for each lettered
position.
A B C D E
Gravitational Potential Energy
Elastic Energy
Kinetic Energy
Internal Energy
(Dissipated to Heat & Sound)
5. Without internal energy:
A B C D E
With internal energy:
A B C D E
Gravitational Potential Energy
Kinetic Energy
Internal Energy
(Dissipated to Heat & Sound)
6. Materials:
• Computer w/ Logger Pro
• LabQuest Mini (Interface)
• Motion Detector
• Baseball
• Wire Basket
Motion Detector
Setup & Procedure:
Conservation of Energy Lab:
7. Data Table:
Conservation of Energy Lab:
Mass of the Ball:
(kg)
Position: Time:
(s)
Height:
(m)
Velocity:
(m/s)
Gravitational
Energy:
(J)
Kinetic
Energy:
(J)
Total
Energy:
(J)
Internal
Energy:
(J)
After Release
0
Between
Release and Top
Top of Path
Between Top
and Catch
Before Catch
The answer is C.
This question is taken from paper 11 of May/June 2013.
The answer is C.
This question is taken from paper 11 of May/June 2013.
If this question was used during period 3, it can be referred to now. Otherwise, quickly work through the problem as a group.
Image from:
https://modelinginstruction.org/
Compare how the results would look if the students excluded or included internal energy. Explain that while it is known that internal energy affects our work, we don’t always understand how much and often choose to ignore it on problems. In this lab, we will examine quantitatively the effect of energy on a tossed ball.
Image from:
https://modelinginstruction.org/
Depending on the students’ ability level:
- Go over the materials with the students and have them confirm that each group has the appropriate materials.
- Go over the setup, procedure, and one example of data collection with the students before allowing them to begin.
Source:
http://www.vernier.com/products/books/pwv/ (from a disc that comes with this book)
Images from:
https://modelinginstruction.org/
http://www.vernier.com/products/books/pwv/ (from a disc that comes with this book)
Depending on the students’ ability level:
- Go over the data to collect and equations needed to calculate.
Source:
http://www.vernier.com/products/books/pwv/ (from a disc that comes with this book)
Images from:
https://modelinginstruction.org/
http://www.vernier.com/products/books/pwv/ (from a disc that comes with this book)
The additional practice can be found in the Cambridge IGCSE Physics: Workbook (Second Edition) written by David Sang.
More information about this coursebook can be found here:
http://education.cambridge.org/as/subject/science/physics/cambridge-igcse-physics-%28second-edition%29/cambridge-igcse-physics-workbook-%28second-edition%29