-Newton’s Laws. Early History Greece ◦ Aristotle (4 th Century BC) Natural and violent motion Galileo Galilei (1564 AD) ◦ Is a force necessary in order.

Slides:

Advertisements

Similar presentations

Unit 4 FORCES AND THE LAWS OF MOTION

Advertisements

Forces and Newton’s 3 Laws of Motion Robert Strawn Compiled 10/16/11.

4. Newton's Laws 1.The Wrong Question 2.Newton’s 1 st & 2 nd laws 3.Forces 4.The Force of Gravity 5.Using Newton’s 2 nd Law 6.Newton’s 3 rd Law.

CHAPTER 5 NOTES KONICHEK. I. Dynamics- why objects move the way they do, A.. kinematics studied how objects move A.. kinematics studied how objects move.

Newton’s Laws.

The Laws of Motion Unit 3 Presentation 1.

Motion & Force: Dynamics Physics 11. Galileo’s Inertia  Galileo attempted to explain inertia based upon rolling a ball down a ramp  Predict what would.

Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical.

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.

Chapter 4: The Laws of Motion Forces  There seem to be two kinds of forces in Nature: Contact forces and field forces.  A contact force is transferred.

KINEMATICSDYNAMICS  Describes motion.  The forces that cause motion.

FORCES AND LAWS OF MOTION. FORCE (push) (pull) Examples of forces: ContactField Pulling the handle of the door Pushing a stroller Hitting a tennis ball.

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 Contact Forces - those resulting from physical contact between objects –Normal Force –Friction –Tension (spring/rope) –Compression Action at a Distance.

Forces Chapter 4. Force & Motion Force-a push or a pull on an object System-the object(s) experiencing the force Environment-the world around the system.

Force A push or pull exerted on an object..

Newton’s Second Law of Motion. Force and Acceleration Force is a push or a pull acting on an object. Acceleration occurs when the VELOCITY of an object.

In order to change the motion Of an object, you must apply A force to it.

Newton’s 1 st Law Inertia. Force  Any push or pull acting on an object  Most forces require contact between two objects (Contact Forces) Ex. Motor lifts.

CHAPTER 4 FORCES IN 1-D FORCE Force is anything which causes a body to start moving when it is at rest, or stop when it is moving, or deflect once it.

All About Forces h?v=HK8afQRrOck.

Sir Isaac Newton Newton’s Laws of Motion Newton’s 1st Law of Motion -An object at rest, will remain at rest, unless acted upon by an unbalanced.

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.

Newton’s Laws Chapter 4 Physics chapter 4.

Today’s Topic Unit 1: Forces Forces BOTH Quantities that have BOTH size and direction are called Vectors. ONLY Quantities that have ONLY size are called.

Ch. 4 Newton’s First Law of Motion

Forces and Newton’s Laws

Forces and Newton’s Laws Physics. The Concepts of Force and Mass Contact forces- push or pull that arises from physical contact between 2 objects –Example:

Chapter 12 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 gives energy.

Unit 3 - Dynamics How Forces Affect Motion. Unit 3 Part 1 – Newton’s Laws of Motion Physics Book Chapter 4 Conceptual Physics Book Chapters 4-6.

1 Chapter 10-Forces All forces that affect motion.

& ForcesForces. Isaac Newton Isaac Newton (1642–1727) Isaac Newton proposed that the tendency of an object was to maintain in its current state of motion.

ForcesandNewton’s Laws of Motion ForcesandNewton’s.

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.

Forces Def – an action exerted on an object to change the object’s state of motion (resting or moving) – Magnitude and direction – Units: Newtons (N) Net.

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.

REVISION NEWTON’S LAW. Quantity with magnitude and direction. e.g. displacement, velocity, acceleration, force and weight.. VECTOR Quantity having only.

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

FORCES Chapter 5. Mechanics The study of Motion Isaac Newton, 1600’s The father of mechanics.

Forces & Motion. Motion A change in the position of an object Caused by force (a push or pull)

Forces Ch TrueFalseStatementTrueFalse Force causes objects at rest to move, or objects moving to keep moving Balanced forces have a net force of.

Newton’s Laws. Newton’s First Law of Motion “Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled.

Chapter 4 Forces in One Dimension. Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting.

The Nature of Force and Motion 1.Force – A push or a pull – How strong it is and in what direction? 2.Net Force – The sum of all forces acting on an object.

NEWTON'S LAWS OF MOTION Philosophiae Naturalis Principia Mathematica (1686)

The Dynamics of Newton’s Laws

Newton’s Laws.

Chapter 8 Forces & Motion.

Newton’s 1st and 2nd laws of 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 Chapter 5.

Forces Force- a push or pull

Newton’s Laws of Motion

Chapter 4 Forces.

CHAPTER 4 FORCES IN 1-D.

Newton’s Laws of Motion

Sir Isaac Newton

Chapter 3 Forces & Newton’s Laws

Forces -Review- IS3.

Newton’s Laws of Motion

Forces & Motion.

Force A push or pull exerted on an object..

In your Journals: Quickwrite on Forces

Forces In order to change the movement of an object, that is to say, to change its velocity, an acceleration must be present. We know that acceleration.

Forces cause changes in motion!

Forces & Newton’s Laws of Motion

Newton’s Laws of Motion

Presentation transcript:

-Newton’s Laws

Early History Greece ◦ Aristotle (4 th Century BC) Natural and violent motion Galileo Galilei (1564 AD) ◦ Is a force necessary in order to keep an object moving?

Galileo’s Experiment with Ball A force is not required to keep the ball moving on a horizontal plane. In the absence of friction, the ball would move perpetually.

Newton’s First Law Isaac Newton -England (1561) 1 st Law – Law of Inertia An object at rest or moving at constant velocity will continue to be at rest or at constant velocity, unless acted upon by a net force.

Inertia---Mass Inertia: the resistance of an object to a change in its state of motion Mass: amount of matter in an object ◦ a measure of inertia ◦ unit: kg ◦ scalar

Seatbelts!!!!!!! ( media/newtlaws/cci.html) media/newtlaws/cci.html

An airplane drops a flare. Which is the path of the flare? A C B v v

Force: a push or a pull Vector Unit: Newton N 1N= 1kg m/s 2 U.S. Customary unit for force: 1 lb= slug ft/ s 2 1N ~ ¼ lb

The 4 Fundamental Forces Gravitational (attractive force between masses) Electromagnetic (caused by to electric and magnetic fields) Strong Nuclear Force (holds nuclear particles together) Weak Nuclear Force (involved in radioactive decay of nuclei)

Types of Forces Contact Forces (Tension, Normal) Field Forces (Electrical, Gravitational)

Friction: a force acting when two surfaces rub against each other. ◦ Friction opposes motion. ◦ Is caused by the irregularities in surfaces.

Normal Force: a force acting perpendicular to the interface of contact between two objects.

Newton’s 2 nd Law ∑ F = m a

Weight: the gravitational force with which the earth pulls an object vector unit: N W=mg

Mass Inertial Mass (from F=ma) Gravitational Mass (from W=mg)

Free Body Diagram:

Example 1 (#3) A 3kg object undergoes an acceleration given by a=(2.00 i j) m/s 2. Find the magnitude of the resultant force. Answer: 16.2N

Example 2 A 2500kg SUV traveling at 30km/h hits a foam barrier and is stopped by a net force of 2000N. Find the distance the car traveled while being stopped by the barrier.

Newton’s 3 rd Law When an object exerts a force on a second object (action), the second objects exerts an equal and opposite force on the first object (reaction). To every action there is an equal and opposite reaction. Forces occur in pairs.

What is the reaction force to: Kicking a soccer ball? The windshield of a bus hitting a fly? The swimmer pulling the water?

Can you hit a piece of paper with a large force with your hand?

What are the reaction forces to the each of the forces shown?

Example 1 Two blocks, one 8 times as massive as the other, are connected by a compressed spring (sitting on a frictionless surface). When the spring is released the blocks fly apart. a) Draw the free body diagram showing the forces acting on each object. b) What is the acceleration of the lighter block relative to the heavier one?

Example 2 Two skaters, a girl of mass 45kg and a 65 kg boy push off of each other. The boy accelerates at 2m/s 2. Find the girl’s acceleration.

Example 3 A student of mass 55kg is standing on the surface of the earth. a)What is the force that the earth pulls the student with? b)What is the force with which the student pulls the earth? c)What is the acceleration of the earth because of the pull of the student?