Chapter 4 Newton’s First Law of Motion: Inertia. Newton’s First Law - Inertia In Fancy Terms: Every object continues in a state of rest, or of motion.

Slides:

Advertisements

Similar presentations

Newton’s Laws and Forces. Forces Force = a push or pull – changes speed of an object – changes direction of an object – can be touching or long distance.

Advertisements

FORCES Mrs. Cholak.

Chapter 13 Forces.

Forces In order to make an object at rest move, you need to apply a push or a pull, otherwise known as a force. A force can make an object:  Speed up.

Force Force is a push or pull on an object The object is called the System Force on a system in motion causes change in velocity = acceleration Force is.

“ If I have seen farther than others, it is because I have stood on the shoulders of giants.” Sir Isaac Newton (1642 – 1727) Physicist.

Ch 4 – Forces and the Laws of Motion. What is a force? A force is a push or pull A force causing a change in velocity –An object from rest starts moving.

Chapter 4 Newton’s First Law of Motion: Inertia. Newton’s First Law - Inertia In Fancy Terms: Every object continues in a state of rest, or of motion.

Motion Notes Speed Momentum Acceleration and Force Friction and Air Resistance Newton’s Laws of Motion.

Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? –A push or a pull that one body exerts on another. 2.

Ch. 4 Forces and Laws of Motion

Chapter 4 Physics. Section 4-1 I. Forces A. Def- a push or pull; the cause of acceleration. B. Unit: Newton Def- amt. of force when acting on a 1 kg mass.

Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? A push or a pull that one body exerts on another. 2.

Motion occurs when an object changes position.

Sir Isaac Newton English physicist & mathematician …he developed the 3 laws of motion Motion is any change in position! p. 45 Click here.

Chapter 5 Newton’s Second Law of Motion – Force and Acceleration

FORCE A force is any influence that can change the velocity of a body. Forces can act either through the physical contact of two objects (contact forces:

JEOPARDY Force and motion. Force Motion 2 Motion 2 Newton’s Laws Newton’s Laws of Motion of Motion Newton’s Laws Newton’s Laws of Motion 2 of Motion 2.

Agenda 1) Warm-Up 5 min 2) Pick-Up Fill-in-blank, Vocab., Orange Chart 3) Vocab. Words 5 min 4) Newton’s First Law 15 min 5) Formula Sheet 5 min 6) Newton’s.

Force A push or pull exerted on an object..

Forces in 1 Dimension Chapter Force and Motion Force is push or pull exerted on object Forces change motion –Makes it important to know the forces.

Chapter 4 Dynamics: Newton’s Laws of Motion

What is a Force? A force is a push or a pull causing a change in velocity or causing deformation.

Chapter 4 Newton’s Laws of Motion. Newton’s First Law of Motion Every object continues in its state of rest, or of uniform motion in a straight line,

Notes Force. Force is a push or pull exerted on some object. Forces cause changes in velocity. The SI unit for force is the Newton. 1 Newton = 1 kg m/s.

Chapters 5-6 Test Review Forces & Motion Forces  “a push or a pull”  A force can start an object in motion or change the motion of an object.  A force.

FORCES Ch.10 “May the Force be with You”. I. Force All forces are exerted by one object on another object. All forces are exerted by one object on another.

Force & Newton’s Laws of Motion. FORCE Act of pulling or pushing Act of pulling or pushing Vector quantity that causes an acceleration when unbalanced.

Forces. Force – a push or a pull Contact – a force acting on a body by touching it Long-range – force exerted on a body w/o contact (gravity, magnetic.

Remember!!!! Force Vocabulary is due tomorrow

Motion & Forces.

Newton’s Second Law of Motion – Force & Acceleration

Ch 4 – Forces and the Laws of Motion. What is a force? A force is a push or pull A force causing a change in velocity –An object from rest starts moving.

Chapter 4: “Newton’s Laws of Motion” Created by G. Frega.

Basic Information: Force: A push or pull on an object Forces can cause an object to: Speed up Slow down Change direction Basically, Forces can cause an.

Newton’s Laws Inertia What is a Force?  The idea the forces caused motion was professed by Aristotle in the 4 th century B.C.  Force – a push or pull.

Unit 3 Newton’s Second Law of motion: Force and Acceleration

17.2 Forces and Motion Mr. Perez. Important Vocabulary Gravitation Force Balanced forces Unbalanced forces Inertia Contact force Friction Non-contact.

Force and Motion The only reason an object changes it velocity is because a force acts on the object. Remember a change in velocity can be either a change.

Forces & Motion. What is a Force? Force: push or pull Unit: Newton (N)  Kg x m/s 2 Vector: has both magnitude & direction.

Forces. I. Section 1 A. Newton- (N) the SI unit for the magnitude of a force. Also called weight. B. Force- a push or a pull. Described by its magnitude.

Forces and Newton’s Laws of Motion. A force is a push or a pull. Arrows are used to represent forces. The length of the arrow is proportional to the magnitude.

1 Physics: Chapter 4 Forces & the Laws of Motion Topics:4-1 Changes in Motion 4-2 Newton’s First Law 4-3 Newton’s Second & Third Laws 4-4 Everyday Forces.

Forces 1 Dynamics FORCEMAN. What causes things to move? Forces What is a force? –A push or a pull that one body exerts on another. 2.

Forces and the laws of motion. Force A bat strikes the ball with a force that causes the ball to stop and then move in the opposite direction.

Chapter 3 Forces & Motion. Newton’s 1 st Law of Motion An object at rest will remain at rest unless acted upon by an unbalanced force. An object in motion.

Motion and Forces.

Newton’s First Law of Motion

Chapter 10 Forces. Chapter 10 Forces (10.1) The Nature of Force GOAL: To understand how force is distributed, and how forces act on one another. VOCABULARY.

Chapter 8 Forces & Motion.

FORCE A force is any influence that can change the velocity of a body. Forces can act either through the physical contact of two objects (contact forces:

Forces FORCEMAN.

Motion & Forces.

Motion & Forces.

Newton’s Laws of Motion

Chapter 4 Forces.

FORCE and MOTION REVIEW

Forces Unit Note-Taking.

Chapter 10 Vocab Review 8th Grade.

Newton’s Laws of Motion Chapters 2,3,6,7

Forces FORCEMAN.

Forces & Motion.

Forces and Motion Ch. 12 Intro to Physics.

Force A push or pull exerted on an object..

Presentation transcript:

Chapter 4 Newton’s First Law of Motion: Inertia

Newton’s First Law - Inertia In Fancy Terms: Every object continues in a state of rest, or of motion in a straight line at constant speed, unless it is compelled to change that state by forces exerted upon it.

In Plain English: Objects in motion tend to stay in motion. Objects at rest tend to stay at rest.

Inertia Definition: the reluctance of any body to change its state of motion

Examples of Inertia Alphabet soup Removing tablecloth with dishes still on the table

So Why Do Things in Motion Stop?

Forces Definition: any push or pull

Friction Definition: the force that acts between materials that touch as they move past each other

- caused by irregularities in the surfaces of objects that are touching

- Even very smooth surfaces have microscopic irregularities that obstruct motion

MASS a measure of inertia measured in kilograms

MASS AND WEIGHT ARE NOT THE SAME THING!!!

Mass: quantity of matter in an object - independent of location

Weight: force of gravity on an object - depends on an object’s location

Mass and Weight are Proportional but NOT Equal a lot of mass = a lot of weight

SI unit of mass – kilogram SI unit of force - Newton

1 kg = 9.8 Newtons (N) weight = mass x gravity w = mg

Net Force Definition: combination of all forces acting on an object

The net forces changes an object’s state of motion In the absence of a net force, objects do not change their state of motion

Normal Force Definition: the upward force that balances the weight of an object Also called support force

Other forces: Tension: At equilibrium – Tension = weight

Equilibrium Net force = zero

Chapter 5 Newton’s 2 nd Law

Remember: Acceleration = change in velocity time interval

What causes acceleration? Force

An objects acceleration is directly proportional to the net force Acceleration ~ net force

Mass resists acceleration Acceleration ~ 1/mass (inversely proportional)

Newton’s 2 nd Law: The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.

In other words : Acceleration = net force/mass a= F/m

Net Force Unit will always be Newtons. 1 N = kg*m/s 2

Free Body Diagram Definition: Diagram showing all the forces acting on an object.

Friction Reminder: Friction is the force that acts to oppose the motion between two materials moving past each other.

Types of Friction Static Rolling Fluid Sliding/Kinetic

Static Friction : resistance force that must be overcome to start an object in motion ex. pushing a desk when it is at rest

Rolling Friction: the resistance force between a surface and a rolling object ex. rolling a ball down a hill

Fluid Friction: the resistance force of a gas or liquid as an object passes through * fluids can be liquids or gases ex. air resistance

Kinetic/Sliding Friction: resistance force between two objects already in motion ex. sliding a book on the table

Force of sliding friction depends on the normal force and on the types of surfaces that are in contact with each other.

Magnitude of Force Force of sliding friction = (coefficient of sliding friction)*(normal force ) F f =  F N

 = coefficient of sliding friction If it’s high – object is not likely to slide easily If it’s low - found between very slippery surfaces

Applying Force Pressure = force per unit of area Measured in pascals (Pa) Pascal = N/m 2

Pressure = Force area of application P = F/A

Pressure is increased when surface area decreases! ex. bed of nails

Falling and Air Resistance Terminal velocity: speed at which acceleration of a falling object is zero because friction balances weight

Free Fall Explained F = F m m

Chapter 6 Newton’s 3 rd Law For every action there is an equal and opposite reaction

All actions occur in pairs

Action: Object A exerts force on Object B Reaction: Object B exerts force on Object A

Newton’s Law of Universal Gravitation Every object is attracts every other object with a force that for any two objects is directly proportional to the mass of each object.

In other words, the greater the masses, the greater the force of attraction between them

F = G m 1 m 2 d where G = 6.67 x Nm 2 /kg 2