EVERY-DAY FORCES Force of gravity Normal force Force of friction Universal force of gravity.

Slides:

Advertisements

Similar presentations

Forces and Newton’s Laws of Motion

Advertisements

Forces and Newton’s Laws of Motion

Forces and Newton’s Laws of Motion

Chapter 4 The Laws of Motion.

Forces and Newton’s Laws of Motion Chapter 4. All objects naturally tend to continue moving in the same direction at the same speed. All objects resist.

1 Chapter Four Newton's Laws. 2  In this chapter we will consider Newton's three laws of motion.  There is one consistent word in these three laws and.

Normal Force Force on an object perpendicular to the surface (Fn)

Kinematics – the study of how things move

Chapter 4 Forces and Mass.

Ballistic Cart Demo Discuss law of cosines for planeinwindb problem Other HW problems?

Forces behind forces Chemical structures, which are essentially combinations of electromagnetic attractions and repulsions, give solid objects their intrinsic.

Forces and The Laws of Motion

Newton’s Second Law of Motion Page Force and Acceleration Force is a push or a pull. Acceleration is when the motion of an object changes. Examples:

Statics (ENGR 2214) Prof S. Nasseri What you need to know from Physics! ENGR 2214.

Chapter everyday forces.

Forces and Newton’s Laws of Motion

Forces Mass, Weight, and Friction. Weight Weight: force of gravity on an object - on Earth your weight is a direct measure of the planet’s force pulling.

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

NEWTON’S FIRST LAW Definition- An object at rest will remain at rest, or if it is moving, it will continue to move with constant velocity, unless acted.

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.

C H A P T E R 4 Forces and Newton's Laws of Motion

Newton’s Laws and Dynamics

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.

FORCES AND LAWS OF MOTION. FORCE EXAMPLES OF FORCES: Close rangeLong Range Pulling the handle of the door Pushing a stroller Hitting a tennis ball with.

SECOND LAW OF MOTION If there is a net force acting on an object, the object will have an acceleration and the object’s velocity will change. Newton's.

Chapter 4 Forces and the Laws of Motion. Newton’s First Law An object at rest remains at rest, and an object in motion continues in motion with constant.

Forces and Newton’s Laws of Motion. 4.1 The Concepts of Force and Mass A force is a push or a pull. Arrows are used to represent forces. The length of.

Chapter 4 Dynamics: Newton’s Laws of Motion

Sponge - A 200 kg hockey player pushes a 150 kg official after receiving a penalty. If he pushes with a force of 500 N, what is the acceleration of each.

Types of Forces.

Chapter 4 Forces and Newton’s Laws of Motion. 4.1 The Concepts of Force and Mass A force is a push or a pull. Contact forces arise from physical contact.

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.

 F = ma  m is measured in kg  a is measured in m/s 2  F is measured in kg m/s 2, called a Newton (N)

Law of universal Gravitation Section The force of gravity: All objects accelerate towards the earth. Thus the earth exerts a force on these.

Types of Forces. Gravitational Force  An attractive force between all objects that have mass.  On Earth gravity is a downward force, always pulling.

Friction Ffriction = μFNormal.

 Force: A push or a pull Describes why objects move Defined by Sir Isaac Newton.

Everyday Forces Weight Normal Force Friction Force.

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.

 Friction – force that opposes motion  Caused by microscopic irregularities of a surface  The friction force is the force exerted by a surface as an.

When a net external force acts on an object of mass m, the acceleration that results is directly proportional to the net force and has a magnitude that.

Chapter 5 The Laws of Motion.

Monday, Mar. 3, 2008 PHYS , Spring 2008 Dr. Jaehoon Yu 1 PHYS 1441 – Section 002 Lecture #12 Monday, Mar. 3, 2008 Dr. Jaehoon Yu Types of Forces.

Push and Pull Newton’s Laws. Newton’s First Law An object at rest remains at rest, and an object in motion continues in motion with constant velocity.

C H A P T E R 4 Forces and Newton's Laws of Motion

As this windsurfer is propelled through the air, his motion is determined by forces due to the wind and his weight. The relationship between the forces.

Forces and the Laws of Motion Chapter 4. Forces and the Laws of Motion 4.1 Changes in Motion –Forces are pushes or pullss can cause acceleration. are.

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

Physics Section 4.4 Describe various types of forces Weight is a measure of the gravitational force exerted on an object. It depends upon the objects.

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.

Friction & Gravity.

An 7.3-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.0 m/s 2. What is the magnitude of the force the object.

Physics Section 4.4 Describe various types of forces Weight is a measure of the gravitational force exerted on an object. It depends upon the objects.

Forces and Laws of Motion Force Force is the cause of an acceleration, or the change in an objects motion. This means that force can make an object to.

Friction. I. Friction A. Background 1. A force that acts opposite the direction of movement 2. Friction slows you down and causes heat.

Circular Motion and the Law of Universal Gravitation.

PHYSICS 101 Lecture 04. Newton’s Laws First Physics.

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

Chapter 4 Forces and Newton’s Laws of Motion. Newtonian mechanics Describes motion and interaction of objects Applicable for speeds much slower than the.

Newton’s Laws of Motion

Forces in Nature.

Sponge - A 200 kg hockey player pushes a 150 kg official after receiving a penalty. If he pushes with a force of 500 N, what is the acceleration of each.

Chapter 4 Laws of Motion.

Chapter 4 Newton’s Laws.

Force Review and Universal Law of Gravitation

Forces and Newton’s Laws of Motion

Forces and Newton’s Laws of Motion

Forces Physics- Ms. Jeffrey.

Presentation transcript:

EVERY-DAY FORCES Force of gravity Normal force Force of friction Universal force of gravity

FORCE OF GRAVITY

Newton ’ s Law of Universal Gravitation Every particle in the universe exerts an attractive force on every other particle. A particle is a piece of matter, small enough in size to be regarded as a mathematical point. The force that each exerts on the other is directed along the line joining the particles.

For two particles that have masses m 1 and m 2 and are separated by a distance r, the force has a magnitude given by

INVERSE PROPORTION

WEIGHT OF AN OBJECT The weight of an object on or above earth is the gravitational force that the earth exerts on the object. On or above another astronomical body, the weight is the gravitational force exerted on the object by that body. Weight = mg, where m- mass of the body, g – acceleration due to gravity (-9.8 m/s 2 )

MASS VS. WEIGHT

Mass is a measure of the amount of “ stuff ” contained in an object. The weight of an object on or above the earth is the gravitational force that the earth exerts on the object. The weight always acts downwards, toward the center of the earth. On or above another astronomical body, the weight is the gravitational force exerted on the object by that body. SI Unit of Weight: newton (N)

Relation Between Mass and Weight

4.7 THE GRAVITATIONAL FORCE On the earth ’ s surface :

Definition of the Normal Force The normal force is one component of the force that a surface exerts on an object with which it is in contact – namely, the component that is perpendicular to the surface.

4.8 THE NORMAL FORCE

Apparent Weight The apparent weight of an object is the reading of the scale. It is equal to the normal force the man exerts on the scale.

EXAMPLE A box with a mass of 10.0 kg is being pulled by a string with a force of 40.0N A) horizontally B) at an angle of 30 degrees to the horizontal with a Neglecting friction find: the acceleration of the box the magnitude of the normal force

EXAMPLE A 10.0-kg box is resting on a 20.0 o incline. Determine the normal force acting on the incline. Find the force of friction acting on the incline. If the incline is frictionless, find the acceleration of the box.

FORCE OF FRICTION When an object is in contact with a surface there is a force acting on that object. The component of this force that is parallel to the surface is called the frictional force.

STATIC FRICTION When the two surfaces are not sliding across one another the friction is called static friction.

Note that the magnitude of the frictional force does not depend on the contact area of the surfaces.

Static friction opposes the impending relative motion between two objects. Kinetic friction opposes the relative sliding motion motions that actually does occur. is called the coefficient of kinetic friction.

The sled comes to a halt because the kinetic frictional force opposes its motion and causes the sled to slow down.

Suppose the coefficient of kinetic friction is 0.05 and the total mass is 40kg. What is the kinetic frictional force?