Term

Definition


Term

Definition


Term

Definition


Term
Name the 5 steps for standard deviation. 

Definition
1. subract the mean from each data point
2. square your answers
3. add all answers together
4. take sum and divide by # of sample
5. take quotent and find √x 


Term
Fill in the blanks for the following example of Standard Deviation:
Mean of 10,12=_____
10____=1^{__}=____
12____=1^{__}=____
___+____=2
2/____=1
√___=1


Definition


Term
What is standard deviation used for? 

Definition
It gives a measure of the percision of a method. 


Term
Class average acceleration=9.6m/s/s±0.4m/s/s
Express this as a percentage of the value for the acceleration. 

Definition


Term
Class average acceleration=9.6m/s/s±0.4m/s/s
Compare the class average value for the acceleration with the acceleration of gravity. 

Definition


Term
Class average acceleration=9.6m/s/s±0.4m/s/s
Express the experomental error as a percentage of the value for acceleration. 

Definition
(ι9.89.6ι / 9.8)(100)=2% 


Term
In an experiment to measure acceleration of a free falling object that involves using a wire and a spark timer, name three possible factors that might reduce the measured acceleration of the mass from the known acceleration of the gravity. 

Definition
human error
air resistance
wire is not straight and can cause object to hit paper 


Term
An object is dropped from rest and falls for 3.5 seconds.
Find:
A) the speed of the object
B) the distance the object has fallen 

Definition
A) v=gt=(9.8m/s)(3.5s)=34.3m/s/s
therefore the object was traveling at 34.3 meters per second per second
B) d=(1/2)gt^{2}=(1/2)(9.8m/s)(3.5s)^{2}=60m
therefore the object fell for 60 meters 


Term
A rock is dropped from the top of a 30 m high cliff.
Find:
A) how long it will take to hit the ground
B) the speed as it hits the ground 

Definition
A) d=(1/2)gt^{2}
30m=(1/2)(9.8m/s^{2})t^{2}
√(60m/9.8m/s^{2})=√t^{2}
2.5s=t
therefore, it will take the rock 2.5 seconds to hit the ground
B) v=gt=(9.8m/s^{2})(2.5s)=24.5m/s
therefore, the rock will be traveling a speed of 24.5 meters per second when it hits the ground 

