Newton’s 2 nd Law. Force on Object Objects acted on by a net unbalanced force will accelerate in the direction of the force This means they will speed.

Slides:

Advertisements

Similar presentations

Aim: What are Newtons 1 st and 3 rd Laws of Motion? Do Now: What is the weight of the box? m = 20 kg F g = mg F g = (20 kg)(9.8 m/s 2 ) F g = 196 N.

Advertisements

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

Drawing free-body diagrams: Air resistance, free fall, terminal velocity and friction Most of the information is from:

More on Newton’s 3 rd Law. Conceptual Example 4-4: What exerts the force to move a car? Response: A common answer is that the engine makes the car move.

Kinematics – the study of how things move

Laws of Motion Review.

Free Body Diagram. Used to show all net forces acting on an object What can an object with a net force of zero be doing?

Copyright © 2012 Pearson Education Inc. PowerPoint ® Lectures for University Physics, Thirteenth Edition – Hugh D. Young and Roger A. Freedman Chapter.

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.

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.

Resistance in Mechanical and Fluid System

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.

Newton’s Laws of Motion 1. If the sum of all external forces on an object is zero, then its speed and direction will not change. Inertia 2. If a nonzero.

Force A push or pull exerted on an object..

Physics Unit Four Forces that Affect Motion. Force A push or a pull. Measured in newtons with a spring scale. 1 newton (N) = 1 kg m/s 2 An apple weighs.

What is the normal force for a 500 kg object resting on a horizontal surface if a massless rope with a tension of 150 N is acting at a 45 o angle to the.

A Force Caused by Gravity.  If we apply Newton’s 2 nd Law to objects accelerating due to gravity F G = mg  F G – force of gravity, commonly called.

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

Force: An action exerted on an object (a push or a pull) in order to change the state of rest or motion of an object. Measured in Newtons (N)

Velocity Definition: the speed and direction of motion of an object. Example: The car moved at a velocity of 20 m/s toward the east.

Force = Mass x Acceleration (F = ma)

 Types of Forces ◦ Contact Forces:  Frictional force: F f  Tensional force: F T  Normal force: F N  Air resistance force: F a  Applied force (push.

Aim: What is Newton’s 2 nd law of motion? Do Now: What is the net (resultant) force? m = 5 kg 10 N8 N Answer will be given shortly.

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.

The stretch of the spring is a measure of the applied force.

Newton’s 1 st Law Inertia. Force Anything capable of changing an object’s state of motion Any push or pull Causes object to speed up, slow down, or change.

Notes: Chapter 11.1 Newton’s 1 st & 2 nd Laws of Motion.

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.

Force. Something that changes the state of rest or the state of motion of an object. Can be a push or a pull Unit of measure Newtons N.

Bellwork Pick up a free-body diagram sheet and begin working on it.

Friction Ffriction = μFNormal.

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.

Newton’s 2nd Law of Motion. Forces A push or pull The cause of an acceleration Cause of a change in an object’s state of motion Cause objects to speed.

Friction & Applying Newton’s 2 nd Law Chapter 6.2 System.

The tendency of objects to resist change in their state of motion is called inertia  Inertia is measured quantitatively by the object's mass.  Objects.

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

Forces and the Laws of Motion

Newton’s Laws 10min test q1 Motion direction pull Weight (force due to gravity – don’t just say ‘gravity’) Friction (opposite to the motion) Contact 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.

MS. MORGAN Force. What is a Force? Something that changes the state of rest or the state of motion of an object. Can be a…. push or a pull Unit of measurement:

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.

Instructions for using this template. Remember this is Jeopardy, so where I have written “Answer” this is the prompt the students will see, and where.

Science Starter! Draw a free-body diagram for: 1)A chair at rest on the floor. 2) A ball rolling to the right and slowing down across a grassy field.

More on Newton’s 3 rd Law. Conceptual Example: What exerts the force to move a car? Response: A common answer is that the engine makes the car move forward.

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 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.

What is a force? An interaction between TWO objects. For example, pushes and pulls are forces. We must be careful to think about a force as acting on one.

Newton’s Laws of Motion

Test Review Hand in day Work/power

Net force, F=ma, and friction

Only 25 more lectures after today!!

Newton’s Laws Acceleration

Forces Third Law First Law and Equilibrium Second Law and Acceleration.

Newton’s Laws of Motion

Notes 2.2: Newton’s 2nd Law of Motion

Chapter 4 Forces.

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

Forces and Free Body Diagrams

Forces and Newton’s Laws of Motion

Newton’s Second Law If all forces are in balance, object is at equilibrium and does accelerate Newton’s second law applies when forces are unbalanced;

Force A push or pull exerted on an object..

(insert scary music here)

Forces cause changes in motion!

Topic: Newton’s 2nd Law of Motion

The study of why objects move.

Presentation transcript:

Newton’s 2 nd Law

Force on Object Objects acted on by a net unbalanced force will accelerate in the direction of the force This means they will speed up, slow down, or change direction

Newton’s 2 nd Law The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to the mass. The direction of acceleration is the same as the direction of the force a = ∑F / m ∑F = ma

Force Redefined Force can be redefined as an action capable of accelerating an object Unit of force is the Newton (N) One Newton is the force needed to accelerate a 1 kg mass at 1 m/s 2 1 N = 1 kg m/s 2

Examples What force is needed to accelerate a 1000kg car at ½ g? What is the net force required to bring a 1500 kg car to rest from 100 km/hr within a distance of 55 m?

A 50 kg go-cart starts from rest and is accelerated by a 550 N force. If the cart experiences a 280 N friction force and 35 N of air resistance, find a) it’s acceleration b) it’s velocity after 3.0 s c) its displacement after 3.0 s

What force must be exerted on a 500 kg crate in order to move it from rest to 3.0 m/s in 1.0 s?

If we apply Newton’s 2 nd Law to objects accelerating due to gravity F G = mg F G – force of gravity, commonly called weight W = mg 2 nd Law and Gravity

When an object is resting on the surface of Earth, the force of gravity is still acting, even though the object is not moving When the contact force acts perpendicular to the surface it is referred to as the Normal Force (F N ) Normal

A 10.0kg box is resting on a table a) draw the free body diagram b) now it is pushed down with a force of 40N. Draw the free body diagram. c) now it is pulled up with a force of 40N. Draw the free body diagram. Ex

A 3.5kg box is resting on the floor. Draw the free body diagram Example

What happens when the box in the previous problem is pulled up with a force of 100N? Ex.