# Unit 3~Chapter 2/3 (HS) Chapter 10 (8th grade book) Motion and Forces

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Unit 3~Chapter 2/3 (HS) Chapter 10 (8th grade book) Motion and Forces

Vocabulary Section 1 force newton net force unbalanced forces
friction static friction sliding friction rolling friction fluid friction gravity mass weight free fall air resistance terminal velocity projectile Section 3 inertia Section 4 momentum law of conservation of momentum

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Motion and Force Essential Question: What does the force of friction between 2 objects in contact depend on? IB Question: Is the force with you?

Tuesday, January 20, 2015 Do NOW: Open textbook to page 349. Fold paper brochure style. Class Assignment: Create a brochure for Newton’s Laws. See example for specifics. Outside: Name and Newton’s Laws 1st panel: 1st Law, Defined, Commonly called, example 2nd Panel: 2nd Law, defined, formula, example 3rd panel: 3rd Law, defined, commonly called, example 4th Panel: Law of Conservation of Momentum, define, formula, example

Wednesday: Chapter 9 Test
Thursday: Make-up work day

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Motion and Force Essential Question: What does the force of friction between 2 objects in contact depend on? IB Question: Is the force with you?

Friday, January 23, 2015 Do NOW: Acceleration Quiz Class Assignment:
Workbook pages, Create an incline with the wood board, place different textures on the board to cause friction test the hot wheels car for time to the bottom and the finish line using a stop watch . Record findings on a data table. Respond with explanation to the following questions: -Which surface tested produced the least friction? Which surface tested produced the most friction?

Monday, January 26, 2015 Do NOW: The tendency of a stationary object to resist being put into motion is known as ________________________________. A. acceleration. B. inertia. C. weight. D. velocity.

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Newton’s Laws of motion Essential Question: Why did Newton establish the 3 laws of motion? IB Question: Is the force with you?

Newton’s Laws Of Motion Name _____________

Newton’s Laws of motion
Newton’s 1st Law of Motion (aka Law of Inertia) An object in motion stays in motion, or an object at rest stays at rest until an unbalanced net force acts upon it. Inertia—tendency of an object to resist any change in its motion. https://www.brainpop.com/science/motionsforcesandtime/newtonslawsofmotion/

Newton’s Laws of motion
Newton’s 2nd Law of Motion A net force acting on an object causes the object to accelerate in the direction of the force. (kg=m/sec2) (kg) (m/sec2) Force = mass X acceleration F=m X a a=f/m m=f/a Acceleration is determined by size of force and the mass of the object.

Newton’s Laws of motion
Newton’s 3rd Law of Motion For every action (or force), there is an equal and opposite reaction (or force). Momentum—property of moving object resulting from its mass and velocity. momentum (p) = mass X velocity

Ticket-out-the-door Answer the essential question: Why did Newton establish the three laws of motion?

Tuesday, January 27, 2015 Do NOW: Think: What do you know about Newton’s 2nd law. Pair: With your elbow partner discuss what you know about Newton’s 2nd law. Share: Prepare to share with the class one thing that you know about Newton’s 2nd law.

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Apply Newton’s 3 Laws Essential Question: Does the mass of a person affect the inertia of the person? IB Question: Is the force with you?

Apply Newton’s 3 Laws Students will test the effect of varying mass on acceleration during the lab, Crash Test Dummy. Each CTD is placed, one at a time, in the car. The car is released down the ramp into a block of wood. The students will measure the distance from the block of wood to where the CTD lands when it flies out of the car. Students will create a line graph to show the relationship between mass and acceleration.

Ticket-out-the-door Describe or draw one example from your life of Newton’s 2nd law. Explain where the force is applied to make the object accelerate and how the mass affects its acceleration.

Wednesday, January 28, 2015 Do NOW:
Complete the Discover Activity on page 334 with a partner. Substitute a plastic coat hanger for the skateboard. You have 15 minutes to complete the activity.

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Motion and Force Essential Question: What does the force of friction between 2 objects in contact depend on? IB Question: Is the force with you?

Balanced and Unbalanced Forces
What is a force? A force is a push or pull that causes an object to move, stop, or change direction In physics a force is anything that makes an object accelerate

Force Forces come in pairs Forces have a magnitude and a direction
5N, north (up) Magnitude: 5N Direction: north (up)

Balanced and Unbalanced Forces
Forces occur in pairs and they can be either balanced or unbalanced

Balanced Forces Balanced forces do not cause change in motion
They are equal in size and opposite in direction

Unbalanced Forces 3 N, right – 6 N, left = 3N, left

Unbalanced Forces 4 N, left – 10 N, right = 6N, right

Unbalanced Forces 5 N, right + 10 N, right = 15N, right

An unbalanced force always causes a change in motion
Unbalanced Forces An unbalanced force always causes a change in motion When unbalanced forces act in opposite directions you can find the net force Net force Magnitude The difference between the two forces Direction Direction of the largest force

TOTD: Describe tug-of-war answering the following questions:
How does a team win tug-of-war? Why is one team able to pull the other over the line? If one team causes the other to move, what do you know about the forces of the teams? Does tug-of-war model Balanced forces or unbalanced forces?

Thursday, January 29, 2015 Do NOW: At what speed would a car have to move in order to travel 20 kilometers in two hours? A. 5 km/hr B. 10 km/hr C. 20 km/hr D. 40 km/hr

Georgia Performance Standards S8P3
Georgia Performance Standards S8P3. Students will investigate relationship between force, mass, and the motion of objects. b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. S8P5. Students will recognize characteristics of gravity, electricity, and magnetism as major kinds of forces acting in nature. a. Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are.

Georgia Performance Standards
SPS8. Students will determine relationships among force, mass, and motion. a. Calculate velocity and acceleration. b. Apply Newton’s three laws to everyday situations by explaining the following: Inertia Relationship between force, mass and acceleration Equal and opposite forces c. Relate falling objects to gravitational force

The Big Idea: Gravity Essential Question: What causes the path of a projection to be curved? IB Question: Is the force with you?

gravity Gravity—any two masses that exert an attractive force on each other. Gravity depends on mass & distance between objects. Weight—gravitational force exerted on an object; measured in units called Newtons. The greater the objects mass, the stronger the gravitational force on it. https://www.brainpop.com/science/motionsforcesandtime/gravity/

gravity PROJECTILE MOTION Projectile—anything that is thrown or shot through the air. A projectile follows a curved path and has the Horizontal and Vertical Motion Motion Motion parallel to Earth’s surface Motion perpendicular to Earth’s surface

gravity CENTRIPETAL FORCE Centripetal acceleration—acceleration toward the center of a curved or circular path “centripetal” means toward the center Centripetal force—force acting toward the center of a curved or circular path

Gravity Students will take the worksheet outside to complete the 4 activities using a football. Students will draw the path of the projectiles for each task given.

Ticket-out-the-door Students will label the drawings of the projectiles.