1. What is Matter?
Mod.H
Unit 1 L. 1

2. Matter is…
Anything that has mass and occupies space

3. ALL matter have two basic properties…
Volume, and
Mass

4. All matter has volume. Property #1 - Volume
How did we prove that air has volume?
Volumes of liquids are measured with what units?
Units for Volume of solids?

5. Volumes …
Can the volume of a gas be measured with a graduated cylinder?
So how can the
volume of a gas
be measured?

6. Measuring the Volume of a gas

7. Find out! Write in your ntbk.
What is AIR composed of?
Is sound matter? What about light?

8. Math in Science! Complete in your ntbk.
A book has a length of 25 cm, a width of 18cm and a height of 4 cm. What is its volume?
2. a) What is the width of a suitcase with a length of 95 cm, a depth of 20 cm and a volume of cm3?
b) What is the volume in m3?

9. Comparing liquid and solid Volumes
Remember: 1 mL = 1cm3
Equipment:
Liquids are measured using a …?
Solids are measured using a … ?
2 Ways:
Displacement - Object itself occupies space
Capacity - Object has space within it

10. How many milliliters of fluid does this object displace?

11. All matter has mass. Property # 2 - Mass Is air matter?
Do you think that air has mass?
Proof?
Continue from here!

12. Mass vs. Weight Weight is NOT mass
Weight is a measure of gravitational force acting on a mass
Measured with a Spring Scale in Newtons

13. Gravity Gravity is the force of attraction between objects
Gravity depends on
the amount of mass, and
the distance between masses

14. Universal Gravitation
Newton’s Law of
Universal Gravitation
All objects in the universe attract each other through Gravitational pull
The size of the force depends on:
The sizes(masses) of the objects, and
The distance between them.

15. Now, your Weight !
The Earth is very large and pulls on you. This pull decreases as you get further from the Earth.
So your weight depends on how close you are to the center of the Earth.

16. Comparing weights A brick and a sponge: Same size (volume)!
The brick weighs more because it is pulled down to Earth more (it has more mass) than the sponge
Weight decreases the further away you go from the Earth’s center

17. So… !
Your weight depends on your mass PLUS how close you are to the Earth’s center.
Weight is measured in Newton's (N) or (kN - kiloNewtons)
1 N ≈ Wt of a 100g

18. Weight is calculated by:
Taking the mass of something
and multiplying it by the gravity
of the planet (9.8 or ≈ 10 m/s2) called acceleration due to gravity (g).
Weight(Force) = mass x gravity
W = m g (units=gm /s2)
or F(weight) = m•a

19. Calculate! F(w) = 30 kg • 9.8 m/s2 = 294 N
What is the weight in newtons, of a set of text books that have a total mass of 3kg?
Convert to g
3kg x 1000g/1kg = 3000 g
Then, Convert to N
3000g x 1N/100g = 30N
The book weighs ≈30N
F(w) = 30 kg • 9.8 m/s2 = 294 N

20. NOTE!!
The greater the mass of an object, the greater the gravitational force on the object and the greater the weight will be.
Mass stays the same for an object even when increased or decreased gravitational forces change the weight of the object.

21. Weight on the moon…. The moon is ≈1/6 the size of the Earth
an object weighs ≈1/6 its weight on the Earth
72 N on earth = ? On the moon
72 N x 1 = 12 N on the moon
If mass = 50kg on earth = ? On moon
Stays the same! = 50kg on moon

22. Differences between mass and weight
Is a measure of amount of matter in an object.
Is always constant for an object, no matter where in the universe
Measured using a beam balance
Units: grams (g)
Is a measure of gravitational pull on an object.
Varies, depending on where the object is in relation to the Earth (or any other large body in the universe)
Measured using a spring scale.
Units: newtons (N)

23. Density Is a measure of amount of mass per unit volume
Is the same for a given substance no matter how much you have
Density = Mass
Volume
D = M / V
Units: g/cm3
g/mL

24. Water has a density of ≈1 g/mL.
Thus, objects with density greater than 1 g/mL sink in water.
Objects with density less than 1 g/mL float in water.

25. HMWK: Math in Science 2 Find the following:
Mass and weight of object on the Moon, if on Earth
a) its mass = 156 g,
b) its weight = 204N,
Weight of object on the Earth if on the moon it weighs:
a) 33 N

26. Answers
1 a) 156g .Mass doesn’t change!
b) 204N x 1/6 = 34 N
2. a) 33N x 6 = 198 N

27. Mass is a measure of Inertia
Think “teenagers”!!!!
When something is at rest, it tends to stay at rest!
The larger the mass, the more inertia the matter has

28. Inertia is … The tendency of an object to resist any change in motion.
The larger the mass, the harder it is to start a stationary object, or stop a moving object

29. HMWK
Guided Practice: Write a paragraph or make a small Graphic explaining :
How the weight of an object can change even though its mass does not change.

30. HMWK - in your Ntbk
Answer these questions:
1. What are the two basic properties of ALL matter?
How is volume measured? How is mass measured?
Analyze. Do objects with large masses have large weights? Explain your reasoning.

31. QUIZ!