Sec 1
sec 2 vocab
measurements
100
What is the reaction time formula?
100
All measurements have uncertainties or random errors.
true
100
The approximate mass of a elementary student is
35kg
200
What is the formula to solve for distance with reaction time?
200
an error produced by using the wrong tool or using the tool incorrectly for measurement and can be corrected by calculation.
systematic error:
200
The approximate length of a hockey stick is
1.5m
300
Mandi drops a ruler and catches it at 10cm. What is the reaction time?
Step 1: find the variables
a=980cm/s squared
d=10cm
Step 2: 10cm*2=20cm
Step 3: 20cm/980cm/s squared =0.020cm
Step 4: square root it=0.14s
300
an indication of how close a series of measurements are to an accepted value.
accuracy:
300
Three students measure the length of their classroom and get the following values:
Student A – 6.54 m Student B – 6.57 m Student C – 6.52 m
Because all three students received three different measurements, this is an example of
systemic error
400
Shannon drops a ruler in 0.10 seconds. What is her distance?
Step 1: find your variables
t=0.10s a=980cm/s square
Step 2: 0.10s*0.10s=0.01s
Step 3: 0.01s *980=9.8
Step 4: 9.8*½= 4.9cm
400
an indication of the frequency with which a measurement produces the
same results.
precision:
400
Earth’s gravity is has the acceleration of
9.8m/s squared
500
Jose catches a ruler with his left hand three times. His distances he catches the ruler is 11.0cm, 25.0cm, and 28.0cm. What is his average reaction time?
0.199
500
The 1500-m race requires a swimmer to swim 30 lengths of the pool. If the pool in one Olympic Games is 50.01 m and in another Olympics the pool is only 49.99 m, then one swimmer will be swimming an extra 2 cm for every lap. In one Olympics, the swimmer may be swimming a total of 60 cm more than the other swimmer.
About how long it will take to swim 60 cm. Assume a good time for the 1500-m race is 15 min.
36s
500
What is the range of lengths for 50-m pools that have an uncertainty of± 10 cm?
49.9 and 51.0