PAG 1.1: Comparing Methods Of Determining g Flashcards
What does this experiment involve?
Comparing three different methods of determining the acceleration of free fall due to gravity
Evaluating the outcome of each experiment
Consider factors involved which give rise to different values achieved
What two formulas link to this PAG?
a=(v-u)/t
s=ut+1/2at^2
What skills are covered?
Use of appropriate analogue apparatus to measure distance
Use of stopwatches and light gates for timings
Use of data loggers to collect and process data
Use of methods to increase accuracy such as set squares and plumb-lines
What are the 3 different methods?
Acceleration down a slope
The trap door method
What quantities are needed to calculate acceleration?
Displacement, time and angle
How would you measure these quantities?
Displacement= analogue apparatuses: metre stick
Time= stop clock
Angle= protractor
How would you use these quantities to calculate the acceleration?
s=ut+1/2at^2
s=1/2at^2
a=2s/t^2
HOWEVER, we are calculating a. down a slope
What factors would affect the accuracy of the measurements?
Parallax error
Reaction times
List the measurements taken
Describe the graph. (Include y and x axis headings, title, meaning of gradient, LOBF and units)
a= y axis m/s^2
sin0= x axis
title=
m= acceleration due to gravity
LOBF=
What are the IV and DV quantities
IV: angle of slope
DV: distance, time and angle: to calculate acceleration
What quantities are needed to calculate the acceleration of an object falling under gravity?
Displacement and time
How would you measure these quantities?
Displacement= analogue apparatus metre stick
Use plumbline to make it more accurate
Time= automated timer
Why might the theoretical calculate value be different from the experimental value?
Assumed air resistance is negligible
Why is the graph a straight line?
Represents acceleration due to gravity which is constant at the Earth’s surface if you ignore air resistance
