Remember: No school on 10/23
8 th GRADE PHYSICAL SCIENCE / MRS. MIRET

BELLRINGERS 10/19 – 10/22 (10/23 NO SCHOOL)
Remember to restate the questions in your answer.
 10/19/2015 Start a new bellringer page in your INB.
What is inertia?
 10/20/2015 What is Newton’s Law of Universal
Gravitation?
 10/21/2015 What are the three types of friction?
 10/22/2015 Give two examples each of contact and non-contact forces.

Answers to Bellringers
10/19 – 10/22
 10/19 Inertia is the resistance to a change in motion.
See Newton’s Laws Vocabulary ACTIVITY #18
 10/20 The gravitational force between objects depends on the mass of the objects and the distance between them.
See Figure 4, page 53 ACTIVITY #20
 10/21 The three types of friction are static friction, sliding friction, and fluid friction.
See Page 55 ACITIVITY # 21
 10/22 Contact and Non-Contact Forces. Choose two of each.
ACTIVITY #21 and the table on the right 
 10/23 NO SCHOOL
CONTACT
FORCES
A push or a pull on one object by another that is touching it.
Frictional Force
Tension Force
Normal Force
Air Resistance
Force
Applied Force
Spring Force
NON-CONTACT
FORCES
A force that one object can apply to another object without touching it.
Gravitational
Force
Electrical Force
Magnetic Force

10/19 ACTIVITY #20
The Law of Universal Gravitation
1.
Go to page 53 in your textbook
2.
Take the page out of your textbook.
3.
Cut out figure 4 and its description:
“The gravitational force between objects depends on the mass of the objects and the distance between them.”
4.
Add this figure to your INB as ACTIVITY #20 :
The Law of Universal Gravitation

10/19 The Law of Universal Gravitation page 53 / figure 4
Answers for the missing words in figure 4.

mass of at least one of the objects increases.
 The gravitational force between objects
as the objects move apart.

Add these definitions to Activity #20



Add these descriptions to Activity #20

is a measure of the pull of gravity on an object.
The amount of gravity determines weight of an object. This means that weight changes depending on where the object is .

is not determined by where an object is but rather by the amount of matter in it. This means that the mass would be the same no matter where the object is.

10/19 ACTIVITY #21: Types of Friction
1.
Go to page 55 of your textbook.
2.
Take page 55 out of your textbook. (The entire page)
3.
Add this to your INB as Activity #21: Types of
Friction.
4.
Complete the “active reading” graphic organizer about the three types of friction.
Answers are in the text above it.

Answers to the graphic organizer at the bottom of Activity #21
STATIC FRICTION SLIDING FRICTION FLUID FRICTION
Prevents two surfaces from sliding past one another.
Sliding friction
opposes the motion of surfaces sliding past each other.
Fluid friction is the friction between a surface and a fluid.
A fluid is any material, such as water or air, that flows.

10/20 Contact and Non-contact Forces
Add this to Activity #21
CONTACT FORCES
A push or a pull on one object by another that is touching it.
Frictional Force
Tension Force
Normal Force
Air Resistance Force
Applied Force
Spring Force
NON-CONTACT FORCES
A force that one object can apply to another object without touching it.
Gravitational Force
Electrical Force
Magnetic Force

10/21 ACTIVITY #22
FORCES AND FLUIDS VOCABULARY 97-118




FORCES AND FLUIDS VOCABULARY
Chapter 3, Lesson 1
 FLUID: Any substance that can flow and take the shape of the container that holds it.
 PRESSURE: The amount of force per unit area applied to an object’s surface.
 ATMOSPHERIC PRESSURE: The ratio of the weight of all the air above you to your surface area.

FORCES AND FLUIDS VOCABULARY
Chapter 3, Lesson 2
 BUOYANT FORCE: An upward force applied by a fluid on an object in the fluid.
 ARCHEMEDES’ PRINCIPLE: States that the weight of the fluid that an object displaces is equal to the buoyant force acting on the object.

FORCES AND FLUIDS VOCABULARY
Chapter 3, Lesson 3
 PASCAL’S PRINCIPLE: States that when pressure is applied to a fluid in a closed container, the pressure increases by the same amount everywhere in the container.
 BERNOULLI’S PRINCIPLE: States that when the speed in a fluid increases, the pressure decreases.

 DRAG FORCE: A force that opposes the motion of an object through a fluid.

ACTIVITY #23 NEWTON’S LAWS REVIEW
Page 73 on the front of the page
(Interpret Graphs)
Page 74 on the back of the page
(Create & Review)
DO NOT CUT OUT THE GRAPHIC ORGANIZER ON PAGE 73
You can’t cut out the graphic organizer on page 73 because it is on the other side of the organizer on page 74.
1.
Copy and complete the graphic organizer on page 73 (Newton’s second law)
2.
Copy and complete the graphic organizer on page 74 (Newton’s laws of motion)

10/21Computer on Wheels Day
Virtual Lab / Newton’s Second Law
INSTRUCTION FOR LOCATING TODAY’S VIRTUAL LAB
 Go to the Clermont Middle Website
 Click on Faculty and Staff
 Click on Miret, Landi
 Click on Webquests
 Click the link to go to the to the virtual lab
 Click on the virtual lab on the new page
VIRTUAL LAB / BASIC INSTRUCTIONS
 Pick one variable to test / Must have same location OR same object being dropped.

Formulas for Newton’s Second Law (F = ma)
Answers to first graphic organizer on
ACTIVITY #24 p 73 solve for force
F = m a solve for acceleration a = F / m solve for mass m = F / a
F = force in N (Newtons) m = mass in kg (kilograms) a = acceleration in m/s²
Meters per second squared

10/21 Activity #24 Solving for force, mass, or acceleration.
Newton’s 2 nd Law / Force = mass x acceleration MATH SKILLS MA.6.A.3.6
1. For a sudden one-hundredth of a second, a volleyball player strikes a volleyball during her serve. Her fist applies a force of 54-N to the 0.27-kg ball.
What is the acceleration of the ball ?
a = F/m a = 54/.27
a = 200-m/s²
2. A 24-N net force acts on an 8-kg rock. What is the acceleration of the rock?
a = F/m a = 24/8 a = 3-m/s²

10/21 Activity #24 Solving for force, mass, or acceleration. Page 2
Newton’s 2 nd Law / Force = mass x acceleration MATH SKILLS MA.6.A.3.6
3. A 30-N net force acts on a skater and produces an acceleration of 0.6 m/s² .
What is the mass of the skater ?
m = F/a m = 30/.6
m = 50-kg
4. What net force is acting on a 14-kg wagon that produces an acceleration of
1.5-m/s² ?
F = ma F = 14 x 1.5
F = 21-N
5. The force of Earth’s gravity is about 10 N downward. What is the acceleration of a 15-kg backpack if you lift it with a force of 15-N ?
a = F/m a = 5/15 a = .33 - m/s²