Forces On An Inclined Plane. FfFf FNFN FgFg 30° Think about the forces as she sleds down the hill in the laundry basket (if it is not a non-frictionless.

Slides:

Advertisements

Similar presentations

Newton’s Laws Overview

Advertisements

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:

An Unbalanced Force FAFA FfFf FgFg FNFN. What is an unbalanced force? According to Newton’s Second Law of Motion: –an unbalanced force is one that causes.

Forces in Equilibrium.

Aim: More friction Do Now:

Make a sketch Problem: A 10.0 kg box is pulled along a horizontal surface by a rope that makes a 30.0 o angle with the horizontal. The tension in the rope.

Net Force Problems There are 2 basic types of net force problems

UNIT 3 Forces and the Laws of Motion. Monday October 24 th 2 FORCES & THE LAWS OF MOTION.

Forces applied at an Angle & Inclined Planes

Aim: How can we explain forces at an angle? Do Now: Solve for the x and y components: 10 N x y 30° x = 5 N x = 8.7 N.

Forces in Two Dimensions - Objectives 1.Addition of ForcesAddition of Forces 2.Resolution of ForcesResolution of Forces 3.Equilibrium and StaticEquilibrium.

Day 51 Friction Aim: What are the different types of Friction? LO: Relate friction to the normal force LO: Calculate friction for different surface combinations.

Forces and the Laws of MotionSection 4 Click below to watch the Visual Concept. Visual Concept Everyday Forces.

Practice A plane flies 1500 miles East and 200 miles South. What is the magnitude and direction of the plane’s final displacement? A hiker walks 80 m.

Forces in Two Dimensions

Friction Friction is a force that opposes the motion, or tendency of motion, of an object. Friction is primarily caused by the chemical bonding of molecules.

FRICTION SLEDS, SANDPAPER, AND LOTS of SLIDING. Friction Any force that resists motion It involves objects that are in contact with each other. This is.

Inclined Plane Problems

Chapter 4 Forces and the Laws of Motion. Chapter Objectives Define force Identify different classes of forces Free Body Diagrams Newton’s Laws of Motion.

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.

Applications involving Friction. What is Friction?  Friction is a FORCE that opposes or impedes the motion of an object.  Friction is caused by microscopic.

Aim: How can we define friction? Do Now: A 20 kg object is being pulled across a table at a constant velocity with a force of 58.8 N. Draw a free-body.

What is the weight of a 15 kg rock?

Aim: More Law of Inertia

Inclined Plane Problems. Forces Acting on the Object F applied F normal F friction WXWX W WyWy Note: The applied force and the force of friction can be.

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.

FIRST Handback quizzes Homework discussion, and talking about cars and hills with a video. Next time: HW turn in HW FOR NEXT TIME: The one titled homework.

CHAPTER 4 The Laws of Motion Newton’s First Law: Newton’s First Law: An object at rest remains at rest and an object in motion continues in motion 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 Dynamics: Newton’s Laws of Motion. Units of Chapter 4 Force Newton’s First Law of Motion Mass Newton’s Second Law of Motion Newton’s Third Law.

Chapter 4 Dynamics: Newton’s Laws of Motion. Units of Chapter 4 Force Newton’s First Law of Motion Mass Newton’s Second Law of Motion Newton’s Third Law.

 Isaac Newton  Smart Guy  Liked Apples  Invented Calculus  Came up with 3 laws of motion  Named stuff after himself.

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

Physics Lesson 8 Static Equilibrium Eleanor Roosevelt High School Chin-Sung Lin.

Unbalanced Forces. A Review of Newton’s 1 st Law: “An object in motion will tend to stay in motion & an object at rest will tend to stay at rest unless.

Aim: How can we describe Newton’s 1st Law of Motion?

Newton 2nd Law problems - Atwood Machines -Incline Planes -Tension Problems -Other Object Connected problems.

Lecture 9: Forces & Laws of Motion. Questions of Yesterday You must apply a force F to push your physics book across your desk at a constant velocity.

On what factors does friction depend?. How can we measure the force of friction between the block and the table?

Friction Ffriction = μFNormal.

Problems Involving Forces

Friction What is friction?. Answer Me!!! Think of two factors that affect friction.

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 Forces and the Laws of Motion. Changes in Motion When we think of Force, we typically imagine a push or pull exerted on an object. When we think.

Forces and Angles Physics 11.

Section 4–4: Everyday Forces Coach Kelsoe Physics Pages 135–143.

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

Friction. Biblical Reference And they pulled him up with the ropes and lifted him out of the cistern. Jeremiah 38:13.

Forces and the Laws of Motion

Physics The Five Force Equation Presented by Denise Jenke.

1.What is the weight of a 15 kg rock? 147 N 2.A skateboard (mass 12 kg ) accelerates from rest to 3.8 m/s over a distance of 9.4m. What is the skateboard.

Forces on an incline. The Gravitational force FgFg FgFg FgFg FgFg FgFg FgFg The gravitational force on an object always points straight down and maintains.

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.

Forces in Equilibrium & Motion along an Incline Chapter 7.1.

Test #3 Notes Forces and the Laws of Motion Circular Motion and Gravitation Chapters 4 and 7.

CHAPTER 4 The Laws of Motion Newton’s First Law: Newton’s First Law: An object at rest remains at rest and an object in motion continues in motion with.

Practice with Inclined Planes

Poll The angle of the hill is 30 . If the ball is moving up the hill, what is its acceleration, if the +x direction is defined to be “to the right, down.

Inclined Plane Problems. Axes for Inclined Planes X axis is parallel to the inclined plane Y axis is perpendicular to the inclined plane Friction force.

Newton’s Laws Forces and Motion. Laws of Motion formulated by Issac Newton in the late 17 th century formulated by Issac Newton in the late 17 th century.

The “Spring Force” If an object is attached to a spring and then pulled or pushed, the spring will exert a force that is proportional to the displacement.

CP Physic Chapter 5 Review 1. The coefficient of kinetic friction is ______ the coefficient of static friction? ans: less than 2. Which of the following.

Chapter 4 Review. Question What is the SI unit of force?

Inclined Planes.

1. A ball of mass m is suspended from two strings of unequal length as shown above. The magnitudes of the tensions T1 and T2 in the strings must satisfy.

Forces and the Laws of Motion

Presentation transcript:

Forces On An Inclined Plane

FfFf FNFN FgFg 30° Think about the forces as she sleds down the hill in the laundry basket (if it is not a non-frictionless surface). Can you label them? What is the formula used to calculate F g ? = mg How many other forces are there? (Don’t make any up!) Two; the normal force (F N ) and the force of friction (F f ).

FgFg 30° F g ll Fg┴Fg┴ The force due to gravity can be broken up into vectors using the tip to tail method. They are F g ll and F g ┴. The formulas used to calculate the components are: = F g cos θ = F g sin θ One way to remember when to use cosine or sine is to look at the formulas on your reference table. A x = A cos θ (horizontal) and A y = A sin θ (vertical). Just use the opposite function for that direction when on an incline. F g ┴ = F g cos θ (vertical) and F g ll = F g sin θ (horizontal).

Other formulas you need to know: – F f = μF N (μ = coefficient of friction) – ΣF x = F net = ma = F gll – F f (ΣF x = sum of the forces in the x- direction)

Example: If a 60 kg person is sledding down a hill on waxed skis (yes, it’s a laundry basket, but just pretend!) at a 30 o incline at a constant velocity, calculate F net, F N, F g ll, F g ┴, F g, and F f. 30° = 588.6N The easiest thing to find first is the weight (F g ). Use the weight to find it’s vectors. = N = 294.3N F g ┴ = F g cos θ F g ll = F g sin θ F g = mg F g ┴ = (588.6N)cos(30°) F g ┴ = (588.6N)(0.866) F g ┴ = N F g ll = (588.6N)sin(30°) F g ll = (588.6N)(0.500) F g ll = 294.3N F g = (60kg)(9.81m/s 2 ) F g = 588.6N FgFg F g ll Fg┴Fg┴

What is the normal force equal to? (Remember, it has to be equal and opposite of another force.) It is equal to F g ┴. The normal force is pushing down with N of force while the ground is pushing up with an equal amount of force. F g ll Fg┴Fg┴ FgFg F N = N 30° To find the force of friction, plug in the normal force and the coefficient of friction that says waxed ski on snow. FfFf F f = μF N This would be ________ friction because it is SLIDING. kinetic *Since coefficients of friction don’t have units, keep the unit of a Newton.* F f = (0.05)(509.73N) F f = 25.49N = 25.49N

The last thing to figure out with all of the forces is the net force. Since she is going down the hill at a constant velocity, what does that mean? ***ZERO acceleration.*** Keep that in mind! ΣF x = F net = ma = F gll – F f 0 F net = F gll – F f F net = 294.3N – 25.49N F net = N 30° F g ll = 294.3N F f = 25.49N Subtract the force of friction because it is in the opposite direction of motion.