Forces 3.1.

Slides:



Advertisements
Similar presentations
Chapter: Forces and Changes in Motion
Advertisements

May the Force of Motion Be With You….. October 8, 2009.
How does friction affect motion?
Set 3: Chapter 5.2 pgs What is a force? Objectives:
Net Force Balanced Force Unbalanced Force
How does friction affect motion?
Newton’s Second Law Physical Science 3.1. Force and Acceleration Greater force = greater acceleration Greater force = greater acceleration Applying force.
Forces and Friction Week of October 15th. What is a force?  A push or a pull exerted on an object in order to change the motion of the object; force.
Section 2-3 Connecting Motion with Forces
DAILY QUESTION January 7, What is the definition of force?
Newton’s first law of motion states that the motion of an object changes only if an unbalanced force acts on the object. Newton’s second law of motion.
Start Misc. 1.
Types of Forces Gravity and Friction. Forces!!!!! PUSH Or A Pull.
Forces Pages 188 to 191. Forces Force - a push or a pull, measured in Newtons (N) Contact Force – is a push or a pull one object applies to another object.
Chapter 3 Section 3 Pages 81-86
Chapter 3: Forces Section 1:Newton ’ s Second Law Force, Mass, and Acceleration Newton ’ s Second Law Friction Air Resistance.
Chapter 13 Forces. What is Force? A push or pull You are exerting a force right now (against the chair, or against the atmosphere) Other objects are also.
3.1 Essential Questions How are force and motion related? How is the net force on an object determined? What is the difference between mass and weight?
FORCES A force is a push or a pull on an object. Every force has strength, magnitude and direction. Forces acting on a stationary object can set the object.
Physical Science Forces
Forces Pages 188 to 191. Forces Force - a push or a pull, measured in Newtons (N) Contact Force – is a push or a pull one object applies to another object.
Chapter 3.3 Friction. Question #1 Friction is resistance force. Friction is defined as the force that opposes the sliding or rolling motion of two surfaces.
Forces. What is a Force? A force is a push or a pull. To tell about a force, you must tell how strong the force is. The SI unit for the strength of a.
Newton’s First Law Notes Force: A push or pull More than one force can act on an object at the same time. Net Force: Combination of all forces acting on.
Newton’s Second Law of Motion Virginia PS SOL.10b.
Describing Motion Newton’s Laws. First we need to define the word FORCE: A push or a pull exerted on an object in order to change the motion of the object.
Newton’s First Law Newton’s First Law: states that if the net force acting on an object is zero, the object will remain at rest or move in a straight line.
Lesson 6 Objectives Observe the properties of sliding friction. Measure the force of friction on a wooden block pulled across different surfaces. Measure.
Newton’s First Law of Motion
How does friction affect motion?
Balanced and Unbalanced Forces
What is force? A force is a push or pull
How does friction affect motion?
NEWTON’S SECOND LAW OF MOTION (Ch. 3-1)
Force.
Lecture 8 Motion and Forces Ozgur Unal
MOTION & FORCE.
The Physical World: Forces
Unbalanced forces change motion.
Newton’s 2nd Law F= ma Force= mass * acceleration
How does friction affect motion?
Forces.
INTRO TO FORCES 4(F) Describe the gravitational attraction between objects of different masses at different distances, including satellites. 4(C) Investigate.
Gravity and Friction Vocabulary
Motion And Forces.
Forces.
Forces.
Do Now:.
Motion and Forces Section 2-3.
Sci. 1-2 What is a Force? Pages
Physical Science Ms. Pollock
FRICTION The force between two objects in contact that opposes the motion of either object. Friction is oppositional or resistance force Friction depends.
Forces Vocabulary.
Forces and Motion Unit Vocabulary
How does friction affect motion?
Warm Up A rock has a density of 4 g/ml and a mass of 16 grams.  What is the volume this rock occupies? An unknown liquid occupies a volume of 5 ml and.
Chapter Menu Lesson 1: Combining Forces Lesson 2: Types of Force
Warm Up A block of aluminum occupies a volume of 15.0 mL and has a mass of 40.5 g. What is its density?
Forces Review 8th Grade Science.
Friction.
Section 1 Forces.
How does friction affect motion?
Force A Force is a push or pull..
Motion and Forces.
Forces and their Effects
Friction & Air Resistance
Forces Ms. MacGillivray.
3.1 Notes How are force and motion related?
Chapter 2 Forces.
How does friction affect motion?
Presentation transcript:

Forces 3.1

Mass - amount of matter in an object Review Vocabulary Mass - amount of matter in an object

What is force? A force is a push or a pull. Applied force changes the movement. Sometimes, it is obvious that a force has been applied. But other forces are not as noticeable. ©Lawrence Manning/Corbis

The force of the moving ball causes the ball at rest to move in the direction of the force.

Net Force When two or more forces act on an object at the same time, the forces combine. This is called a net force. Forces on an object that are equal in size and opposite in direction are called balanced forces. The net force is zero. Net Force =0

+ What is the result of unbalanced forces? Net Force = When the forces are not balanced, the net force that moves the object is the difference between the two forces. + Net Force =

unbalanced forces The forces combine, or add together, because they are exerted in the same direction. The net force is equal to both forces added together. + Net Force =

Friction is the force that opposes the sliding motion of two surfaces that are touching each other.

The amount of friction between two surfaces depends on: The kind of surfaces that are touching. The amount of force that is pressing the surfaces together.

What Causes Friction? Friction is caused by the microwelds that form where the surfaces are in contact.

What makes things stick together? The greater the force pushing two surfaces together, the stronger the microwelds will be. To move one surface over another, a force must be applied to break these microwelds.

Types of Friction

Types of Friction Definition - Caused by: Examples: Definition - In your notebook, make a graphic organizer for the 3 types of friction. For each type give a definition, state why it is caused by, and give at least 2 examples of that type. Types of Friction Definition - Caused by: Examples: Definition - Caused by: Examples: Definition - Caused by: Examples:

Static friction is the force that keeps two surfaces at rest from sliding across each other. Caused when the force is not large enough to break the microwelds

Sliding friction is the force that works against the motion of two surfaces that are sliding across each other. caused by the microwelds breaking and then forming again

Rolling friction is the frictional force between a rolling object and the surface it rolls on. Caused when the object and surface are deformed at their point of contact