October 19- October 23, 2015Remember: No school on 10/23

8th 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?

10/20/2015What 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 Bellringers10/19 – 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

NON-CONTACT FORCES

A push or a pull on one object by another that is touching it.

A force that one object can apply to another object without touching it.

Frictional Force

Gravitational Force

Tension ForceElectrical Force

Normal ForceMagnetic Force

Air Resistance Force

 

Applied Force  

Spring Force

10/19 ACTIVITY #20The 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 4Answers for the missing words in figure 4.

The gravitational force if the mass of at least one of the objects increases.

The gravitational force between objects as the

objects move apart.

increases

decreases

Gravity vs MassAdd these definitions to Activity #20

Gravity is an attractive force (gravity) that exists between all objects that have mass.

Mass is the amount of matter in an object.

Weight vs MassAdd these descriptions to Activity #20

Weight 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.

Mass 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 ForcesAdd this to Activity #21

CONTACT FORCES NON-CONTACT FORCESA push or a pull on one object by another that is touching it.

A force that one object can apply to another object without touching it.

Frictional Force Gravitational Force

Tension Force Electrical Force

Normal Force Magnetic Force

Air Resistance Force  

Applied Force  

Spring Force

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

Add the forces and fluids vocabulary and definitions to your INB as Activity #22

The vocabulary words and their definitions. page 97-118.

There are 8 in total.

FORCES AND FLUIDS VOCABULARYChapter 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 VOCABULARYChapter 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 VOCABULARYChapter 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 REVIEWPage 73 on the front of the page (Interpret Graphs)

Page 74 on the back of the page (Create & Review)

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)

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.

10/21Computer on Wheels DayVirtual 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 = masolve for acceleration

a = F/msolve 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 2nd 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 2Newton’s 2nd 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-N5. 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