1. 9/18 & 9/ th Grade Agenda
Learning Objective: Learn about accuracy and reproducibility
Collect HW: Reading & Notetaking 30-33
Collect HW: Signed Grade Printout
Spaghetti Bridge Lab
Chap 1 Study Guide
Video: Cosmos
Textbook reading: p
HW: Reading & Notetaking p.35 – 37
Reminder Chap 1 Test on 9/23

2. Daily Reflection
Prompt: What is the difference between guessing and estimating?

3. What is the difference between Mass and Weight?
Weight is a measure of force of gravity on you.
90 pounds = 400 newtons
Mass is a measure of the amount of matter an object contains

4. What is Volume? ace M ass V olume
Volume is the amount of sp______ an object takes up.
Density = _________
ace M
ass V
olume

5. What is Density? lume ngth dth ight
Density is mass per unit vo__________
For Rectangular Solilds
Volume = Le_______ X Wi______ X He______
lume
ngth
dth
ight

6. Which object will float in water?
Wood = .8 g/cm3
Ice = .9 g/cm3
Water = 1.0 g/cm3
Aluminum = 2.7 g/cm3
Gold = 19.3 g/cm3

7. What is the difference between Guessing and Estimating?
An estimate is an approx___________ of a number based on reasonable assum___________
A Guess is an opinion about something without having suff__________evidence to support the opinion fully.
imation
ptions
icient

8. Accuracy and reproducibility
urement
Accuracy: How close a meas___________ is to the true or actual value.
Reproducibility: How close a group of meas_________ is to each other
Scientists aim for both accu_______ and reproducibility in their measurements
urement
racy

9. cise Significant Figures mated 2
Significant Figures in a measurement include all of the digits that have been measured exactly, plus one digit that has been esti________.
5.3 centimeter has _____ significant figures
Precision is a measure of the exactness of a measurement.
5.32 cm is more pre______ than 5.3 cm
mated 2
cise

10. Slope aph ange Slope is the steepness of the gr_______ Line.
The slope of a graph line tells you how much Y changes for every ch________ in X.
ange

11. Linear vs Nonlinear lines
A line graph in which the data points yield a stra______ line is a linear graph
A line graph in which the data points do not fall along a straight line is called a nonlin_______ graph
ight
ear

12. What is Matter ss
Matter is anything that has ma____ and takes up sp_____.
ace

13. Chemical Property of Matter
A physical property is a characteristic of pure substance that describe its ability to change into different substance.
These include:
Flamm___________
Ability to React
Ability to turn into new subs_______
ability
tance