friday, march 19 th agenda collect conservation of energy worksheets lab discussion lab:...
TRANSCRIPT
Friday, March 19th
AgendaCollect Conservation of Energy WorksheetsLab DiscussionLab: “Determining Energy for a Rolling Ball”
Homework: NONE!
Lab: “Determining Energy for a Rolling Ball”In this lab, you will be calculating a ball’s
kinetic energy as it rolls down a ramp and comparing that value to the potential energy that the ball has at the top of the ramp.
Lab: “Determining Energy for a Rolling Ball”Take a few minutes to read through the lab to
become familiar with the procedure…
Lab:“Determining Energy for a Rolling Ball”The first step in conducting this lab it to make
a data table to record your data.You will be making a ramp out of a piece of
wood and a stack of books.You release a ball from the top and time the
amount of time it takes to reach the bottom of the ramp.
Lab:“Determining Energy for a Rolling Ball”Using the equations for kinetic and potential
energy, you will calculate both the kinetic and potential energy of the ball and compare the two.
You will test 3 different ramp heights and compare the energies you find.
Once everyone is finished collecting data, we will come back into the classroom for the calculations.
Lab:“Determining Energy for a Rolling Ball”
There are no real safety issues with this lab, but still be careful…
Have fun!
Lab Calculations1. To convert grams to kilograms:
a. Divide your number of grams by 1,0002. To find the average time ball traveled (s):
a. Time ball traveled for trial #1Time ball traveled for trial #2
+ Time ball traveled for trial #3Answer
b. Divide Answer by 3 to get average time (s)
Lab Calculations
5. To calculate final kinetic energy (J):a. Use the equation for kinetic energy
KE = ½ X (mass of ball) X (final speed)2
6. To calculate initial potential energy (J):a. Use the equation for potential energyPE = (mass of ball) X (9.8 m/s2) X (ht of ramp)
Defending Your ConclusionsOn a separate piece of paper, answer these
questions on COMPLETE SENTENCES using information from your data table.
Be sure to answer ALL PARTS of the questions, not just a Yes or No…