Science Academy Science Academy Open Inquiry Open Inquiry Assessment Assessment Objective: Objective: To determine the value of To determine the value of “ “ g g ” ” as accurately as as accurately as possible. possible. William Liu, Leona Lu, Stella So, William Liu, Leona Lu, Stella So, Alison Wu Alison Wu
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Science Academy Science Academy Open Inquiry AssessmentOpen Inquiry Assessment
Objective: Objective:
To determine the value of To determine the value of ““gg”” as accurately as possible. as accurately as possible.
William Liu, Leona Lu, Stella So, Alison William Liu, Leona Lu, Stella So, Alison WuWu
ExperimentExperiment1. Measure the value of "g" by using 1. Measure the value of "g" by using
a super ball and meter stick. a super ball and meter stick.
2. Measure the value of "g" by 2. Measure the value of "g" by dropping an object from a high dropping an object from a high distance to the ground.distance to the ground.
Formula Using: Formula Using:
g = 2d/t^2 g = 2d/t^2
d=distance (m)d=distance (m)
t=time (s)t=time (s)
Experiment 1Experiment 1
Materials:Materials:
Digital timer Digital timer
Meter stick Meter stick
White paper tape White paper tape
Whiteboard eraserWhiteboard eraser
A super ball A super ball
Procedure:Procedure:
Stabilize the meter stick against Stabilize the meter stick against the wall to keep it vertical. the wall to keep it vertical.
Drop the super ball from the top.Drop the super ball from the top. When the ball hits the ground, the When the ball hits the ground, the
digital timer should be started by digital timer should be started by the partner who is responsible for the partner who is responsible for timing.timing.
Record the height that the ball Record the height that the ball bounces.bounces.
When the ball hits the ground When the ball hits the ground again, the timer must be stopped.again, the timer must be stopped.
Make measurements.Make measurements. Enter the data into a table. Enter the data into a table.
Measure the value of "g" by using a super Measure the value of "g" by using a super ball and meter stick. ball and meter stick.
The time showing on the timer is twice the time for the ball to The time showing on the timer is twice the time for the ball to fall. Divide the time on the timer by 2 to get "t". "d" is the height fall. Divide the time on the timer by 2 to get "t". "d" is the height the ball bounces to. "g" is the "g" in d = 1/2 g. Therefore g = the ball bounces to. "g" is the "g" in d = 1/2 g. Therefore g = 2d / t22d / t2
g = 2d / t^2 g = 2d / t^2
t = 0.80/2 = 0.40 s t = 0.80/2 = 0.40 s d = 84.2 cmd = 84.2 cm
g = 2(84.2)/(0.40)^2g = 2(84.2)/(0.40)^2g = 1052.5 cm/s = 10.525 m/s^2 g = 1052.5 cm/s = 10.525 m/s^2
The calculation is same as Experiment 1-1The calculation is same as Experiment 1-1
g = 2d / t^2g = 2d / t^2
t = 0.824/2 = 0.412t = 0.824/2 = 0.412d = 81.0 cm d = 81.0 cm
g = 2(81)/(0.412)^2g = 2(81)/(0.412)^2g = 954.378 cm/s = 9.54 m/s^2 g = 954.378 cm/s = 9.54 m/s^2
Experiment 2Measure the value of "g" by dropping an object Measure the value of "g" by dropping an object from a high distance to the ground.from a high distance to the ground.
Material:
Object - ball
digital timer
String
meter stick
Scissors
Procedure:Procedure:
Measure the distance to the Measure the distance to the ground by using the string and ground by using the string and meter sticks.meter sticks.
Drop the object several times. In Drop the object several times. In each case, start the timer when each case, start the timer when the object is released and stop the object is released and stop the timer when the object hits the timer when the object hits ground.ground.
Keep track of the time in a table.Keep track of the time in a table.