Lab exam
Directions: Do TWO of the first THREE parts AND do all of Part IV.

Part I: Velocity Lab

What is the velocity of a golf ball if it takes 1.5 seconds to roll 3.0 meters? (Show your work)
 
 
 

Why do you NOT start timing the ball while it is still rolling down the ramp?
 
 
 

What are replications and why did we do them?
 
 
 

What is the purpose of the ramp (aka inclined plane) in this lab?
 
 
 

What trend did we establish in the data?
 
 
 
 

Part II: Lever Lab

What was the ringstand used for in this experiment?
 
 
 

What three variables were manipulated in this lab?
1)

2)

3)

If you have a mass of 30 grams on one side at a distance 20 cm from the fulcrum, how far down the fulcrum would you have to place 50 g from the fulcrum for it to balance? (Show your work!)
 
 
 
 

Why were the products (i.e., mass times distance) of the two sides of the level not equal to one another most of the time?
 
 
 
 

Name a possible source of error in this lab.
 
 
 

Part III: KE and PE Lab

What variable did we manipulate by using a marble and a ball bearing?
 
 

How much potential energy would a 10 kg cannon ball have at the top of a 2 m high ramp? (Show your work!)
 
 
 

How much kinetic energy is in a 5 g bullet moving at 100 m/s? (Donít forget to convert!  And show your work!)
 
 
 

What is one of the first things you would do when you get a balance out to measure how much something weighs.
 
 
 

Why was the KE always less than the PE?
 
 
 
 

Name a possible source of error in this lab.
 
 
 
 

Part IV: Graphing
 

Plot the following data series on a graph:

MarbleBall Bearing
HeightPEHeightPE
(cm)(J)(cm)(J)
1051012
20102024
30153036
40204048

On your graph, include the following:
Title
Labeled axes
Key (marble = hollow circles, ball bearing = solid circles)

Why is the Height of the Ramp on the x-axis?
 
 

Why is the Potential Energy of the Ball on the y-axis?
 
 

Why do we draw a single straight line connect the points?
 
 
 


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