Aim: How can we apply Newton’s Second Law?

Slides:

Advertisements

Similar presentations

Advertisements

 The force that act on the object are balanced in all direction.  The force cancel each other, so that the resultant force or net force is zero.  Newton’s.

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.

Section 4-7 Solving Problems with Newton’s Laws; Free Body Diagrams

Forces In One Dimension.

Motion and Force Dynamics

Module 4, Recitation 2 Concept Problems. ConcepTest Tension I 1) 0 N 2) 50 N 3) 100 N 4) 150 N 5) 200 N You tie a rope to a tree and you pull on the rope.

Net Force Contents: What is the Net force Using Newton’s Second law with more than one forceUsing Newton’s Second law with more than one force Whiteboard.

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.

 Friction opposes motion  Friction is dependent on the texture of the surfaces  Friction is dependent on normal force motionfriction.

Applying Newton’s Laws. A systematic approach for 1 st or 2 nd Law Problems 1.Identify the system to be analyzed. This may be only a part of a more complicated.

Physics 121 Topics: Course announcements Quiz Newton’s Law of Motion: Force Newton’s First, Second, and Third Law of Motion Problem Solving Strategies.

Department of Physics and Applied Physics , F2010, Lecture 7 Physics I LECTURE 7 9/27/10.

Kinds of Forces Lecturer: Professor Stephen T. Thornton

NEWTON'S LAWS OF MOTION There are three of them.

Newton’s Laws Problems

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.

Applications & Examples of Newton’s 2nd Law

Newton’s Second Law In this chapter we investigate the effect of a net force on a mass. Newton’s Second Law is: Whenever an unbalanced force acts on a.

Solving Problems with Newton’s Laws

AP Physics I.B Newton’s Laws of Motion. B.1 An interaction between two bodies resulting in a push or a pull is a force. Forces are of two types: contact.

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.

AIM: What are Newton’s three laws, and how do they describe how an object behaves? Do Now: - Draw a Free Body Diagram for the block below if 1. it is at.

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.

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.

PHYS16 – Lecture 10 & 11 Force and Newton’s Laws September 29 and October 1, 2010

Net Force Contents: What is the Net force Using Newton’s Second law with more than one forceUsing Newton’s Second law with more than one force Whiteboard.

Newton's Laws of Motion 1. Newton 1 st law of motion 2. Newton 3 rd law of motion 3. Newton 2 nd law of motion.

Applications & Examples of Newton’s Laws. Forces are VECTORS!! Newton’s 2 nd Law: ∑F = ma ∑F = VECTOR SUM of all forces on mass m  Need VECTOR addition.

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

AP Physics C I.B Newton’s Laws of Motion. Note: the net force is the sum of the forces acting on an object, as well as ma.

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.

Apparent Weight The weight of an object is the force of gravity on that object. Your sensation of weight is due to contact forces supporting you. Let’s.

Weight & Normal Force Weight  The force of gravity on an object.

Physics 211 Lecture 5 Today’s Concepts: a) Free Body Diagrams

Chapter 4 Dynamics: Aim: How can we describe Newton’s Laws of Motion? © 2014 Pearson Education, Inc.

Weight vs. Apparent Weight Physics 11. Elevator:  When you enter the elevator and press the button, you feel the normal amount of your weight on your.

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.

Physics 211 Lecture 5 Today’s Concepts: a) Free Body Diagrams b) Force due to strings c) Force due to springs d) Force due to gravity.

More About Force 3) When one object exerts a force on a second object, the second exerts an equal and opposite force on the first. F AB = -F BA.

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.

Force and Motion–I Chapter 5. Newton's First and Second Laws A force: o Is a “push or pull” acting on an object o Causes acceleration We will focus on.

Free-body diagrams Pg. 17 in NB. Identify normal forces. Draw a free-body diagram with forces in vertical and/or horizontal directions. Calculate the.

Newton’s Laws of Motion

Is it always equal to the weight (mg) of the object? Why or why not?

4*6 Forces Acting During Acceleration: Apparent Weight on a Roller Coaster WDYS??? (p406) . WDYT??? Your weight (does/does not) change when you are riding.

Physics 218 Lecture 6: Dynamics Alexei Safonov.

Force is part of an interaction

AP Physics Review Ch 4 – Forces and Newton’s Laws of Motion

Unbalanced Forces Part #1.

Apparent Weight.

Refresher: *Acceleration is only caused by an unbalanced net force acting on an object. F = ma F = F1 + F2 + … *The weight of an object is referred to.

Phys 270 Newton’s Laws.

Aim: How do we define equilibrium in a system?

Force and Motion A force is something that is capable of changing an object’s state of motion, that is, changing its velocity.

FORCES AND NEWTON’S LAWS OF MOTION

Newton’s Laws of Motion

Ch. 5 slides Forces.ppt.

Forces and Free Body Diagrams

Exam I is Monday, September 26!!

Example Problems for Newton’s Second Law Answers

Force Problems.

Step 1: Get Organized Draw a picture.

Aim: How do we explain Newton’s second law of motion?

Applying Newton’s Laws

Bell Ringer Socrative Quiz- Newton’s Laws Room: LEE346

Net Force Contents: What is the Net force

Newton’s 3rd Law and Free Body Diagrams

ELEVATOR –WEIGHT and NEWTON’S SECOND LAW

Presentation transcript:

Aim: How can we apply Newton’s Second Law? Do Now: Quiz Homework: Problem Set

Forces on Earth Weight is force due to gravity for an object. On Earth g = 9.8 m/s2 How would the force an object exerts on earth’s surface compare with that of the moon? How would the force an object exerts on earth’s surface compare with that of the moon?

Free Body Diagram Review Objects at at rest all have a net force of zero because they are at equilibrium. An object on a table has a force pushed up on it by the table because the table is elastic. This is usually called the normal force.

3 Situations Station Activity Students will answer the following questions at each station regarding a mass. Use the 4-Step Method! Use a 1kg mass (1000g)

4 Steps for Equilibrium Problem Draw a Free Body Diagram Write that the “Up Force = Down Force” & “Left Force = Right Force” Write Newton’s Second Law in all directions Solve for Unknown Draw free body diagram from last demo F1 is force of person on block, F2 is force of person on block

Station 1 A 500 g mass is sitting on the table. If you push down on the mass with a force of 5 N, what is the normal force exerted on the mass by the table?

Station 2 The 500 g mass sitting on the table has a string attached to it. Pull on the string with 4 N force upwards. What is the resulting normal force?

Station 3 The mass sitting on the table has a string attached to it. Pull on the string with 7 N force upwards. What is the resulting normal force? Is there a net force? What is it? FN = 0, but there is a net force.

Elevator Physics A 65 kg woman descends in an elevator that briefly accelerates at 0.2g downward when leaving a floor. What is her apparent weight during acceleration? What does the scale read when traveling at a constant speed of 2.0 m/s? Lets hop in an elevator and find out! a. Sum of F = ma FN - mg = ma FN = mg – m0.2g (negative acceleration for right term since accelerating downwards) b. FN - mg = ma = 0 for constant speed c. FN – mg = m(0.2g) (Positive acceleration for right term since upwards)

Tension is the force between strings. If we assume the cord has no mass then the tension is equal on both ends. FT + (-FT) = 0

What is the acceleration of box B and Box A? (Assume Frictionless) Draw a FB diagram for both boxes Set up horizontal and vertical forces separately. 3. Apply Newton’s second Law 4. Solve Unknown! Box 1: Fx = FP – FT = mAax Box 2: Fx = FT = mBax aA = aB

Summary 1. Justify the forces between two objects connected by a taut rope. (Just explain the forces involving the rope). 2. Why can a rope only pull? 3. Explain the forces you feel when in an elevator going down and then stopping.