Warm Ups. Mini Quiz: In PEN w/ no cross outs! 1)At what position is the vertical velocity zero? 2)What is the direction of the acceleration of the rock.

Slides:



Advertisements
Similar presentations
Chapter 4.
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.
Forces In One Dimension.
Normal Force Force on an object perpendicular to the surface (Fn)
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.
Newton’s Laws of Motion A journey into inertia, net force, and other topics….
Forces A box is being pulled across a surface by a horizontal rope. The force: applied by the rope is called _________. resisting the motion is called.
Forces applied at an Angle & Inclined Planes
ELEVATOR PHYSICS.
Do Now: Do Now: 1. What is the formula to calculate weight? 1. What is the formula to calculate weight? 2. A. Draw the resultant force and calculate it.
Friction is a force that opposes the motion between two surfaces that are in contact  is a force that opposes the motion between two surfaces that are.
What is the weight of a 15 kg rock?
Free-body diagrams Pg. 15 in NB
Force (Weight) (Tension) Friction Force MIDTERM on 10/06/10 7:15 to 9:15 pm  Bentley 236  2008 midterm posted for practice.  Help sessions Mo, Tu 6-9.
Types of forces. Forces acting on an object All forces are measured Newtons. Not all forces are present in every situation. Identify the forces that apply.
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.
Forces in Two Dimensions
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.
Review for Dynamics test Page 1Page 1 - Net force with weight Page 2Page 2 - Friction on a level surface Page 3 Page 3 - Inclined Plane Page 4 Page 4.
Newton’s Laws of Motion We have studied “kinematics”, or the description of motion. Now, we look at “dynamics”, the causes of motion.
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.
PAP Physics. Unit is the NEWTON(N) Is by definition a push or a pull Can exist during physical contact (Tension, Friction, Applied Force) Can exist with.
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.
Vectors and Linear Motion. Vector Quantities: Have a magnitude And direction ex: meters, velocity, acceleration Scalar Quantities: Have only a magnitude.
Aim: How can we describe Newton’s 1st Law of Motion?
Force Diagrams And Types of Forces. Review Force = push or pull. Measured in Newtons. –1 lb = 4.45 N F net = ma a = F net / m Big force = big acceleration.
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.
Ch. 4 Newton’s First Law of Motion
Equilibrium & Newton’s 2nd Law of Motion
Remember!!!! Force Vocabulary is due tomorrow
Force A. Force is the push or pull exerted on an object. 1. Contact force: “I can not touch you without you touching me” 2. Field force: ‘How does the.
Bellwork Pick up a free-body diagram sheet and begin working on it.
Friction Ffriction = μFNormal.
Warm Ups. Mini Quiz: In PEN w/ no cross outs! 1)At what position is the vertical velocity zero? 2)What is the direction of the acceleration of the rock.
Friction. Biblical Reference And they pulled him up with the ropes and lifted him out of the cistern. Jeremiah 38:13.
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.
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.
CP Physics Chapter 4 Newton’s Laws Force Force (F) is a push or a pull Measured in Newtons (N) for SI, pounds (lb) in US. (4.45 N = 1 lb) It has magnitude.
AP Chapter 4. Force - a push or pull Contact Force – Noncontact Force – mass.
“ Friendship is like peeing on yourself; everyone can see it, but only you get the warm feeling it brings.” Funnyquotes.com Course web page
Physics Fall Practice Final Exam 25 Questions Time = Less than 30 minutes.
PHY 151: Lecture Forces of Friction 5.9 Newton’s Second Law.
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.
Forces. Log into my website, click the Introduction to Forces Notes On a note card, define the following terms: Force Newton Unbalanced force Contact.
Forces & Free Body Diagrams Aim: How can we account for multiple forces acting on a single object?
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.
Warm Ups.
Forces & Free Body Diagrams
Newton’s Third Law of Motion
Newton’s Laws Forces and Motion.
A ball is rolling along a flat, level desk. The speed of the ball is 0
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.
Force Vectors and Equilibrium
Net Force.
Newton’s Laws of Motion Chapters 2,3,6,7
Newton’s Laws of Motion
Forces and Newton’s Laws of Motion
Chapter 6 – Forces in Motion
Chapter 4.
Bell Ringer Socrative Quiz- Newton’s Laws Room: LEE346
Applying Forces AP Physics 1.
Coverage of the 1st Long test
Newton’s 3rd Law and Free Body Diagrams
Applying Forces AP Physics C.
Chapter 4.
Presentation transcript:

Warm Ups

Mini Quiz: In PEN w/ no cross outs! 1)At what position is the vertical velocity zero? 2)What is the direction of the acceleration of the rock at point B? a)Upward b)Downward c)In the direction of point C d)In the direction of point A

Mini Quiz: In PEN w/ no cross outs! A stone is thrown horizontally from the top of a m tall cliff. If the stone has a horizontal velocity of 15m/s, how far horizontally from the edge of the cliff will the stone land? 5) What is the first thing you need to calculate to solve this problem? a)Horizontal velocity b)Vertical velocity c)Drop time d)Height of the cliff 3) For an object that is accelerating, the velocity vs. time graph has what type of “shape” a)Sloped Line b)Curve c)Flat line d)I don’t know 4) For an object that is accelerating, the position vs time graph has what type of “shape” a)Sloped Line b)Curve c)Flat line d)I don’t know

Mini Quiz: In PEN w/ no cross outs! 6) Which of the following v vs. t graphs shows an object moving to rest? 7) Jordon runs at 30m/s. Alicia bikes at 60m/s. If they both travel for 5 seconds, then Alicia will travel: a)Twice as far b) The same distance c) Four times as far d) Half as far A v m/s (s) 0 v m/s (s) 0 v m/s (s) 0 v m/s (s) 0 BCD

Mini Quiz: In PEN w/ no cross outs! 8) Which interval is the object not moving? 9) Which interval is the object accelerating? 10) Which interval is the object moving backward? a)I -II b) II-III c) III-IV d) IV-V

Mini Quiz: In PEN w/ no cross outs! 11) Which correctly shows the resultant vector of the following two velocities: a)b)c)d) Zero 12) What is the x component of the following vector: a) 8.66b) 51.96N c) 5.0Nd) 29.54N 30° 60° 10N

Mini Quiz: In PEN w/ no cross outs! 13) What is the y component of the applied force? a) 17.2Nb) 21.7N c) 25Nd) 12.5N 14) What is the x component of the following vector: a) 5.0Nb) 9.6N c) 13.0Nd) 28.9N 30° 25N 15N

Announcements Hello Lexa and Johnny (and any other student viewing this). Use this powerpoint to catch up on what you missed!

Forces Introduction New Sheet: Lets look at what we know so far….. Go through side 1 together (This is the Forces_Notes 4)…also posted on my Wiki

Forces WHITEBOARDS For each of the following questions, determine the net force. You must SHOW YOUR WORK for each question Y NET FORCE Vector X

For the following slides: 1) Find the NET FORCE ▫ This means you find the sum of the forces acting on the object. Watch out for the direction. Left = (-) and right = (+). Up = (+), down = (-)

Forces WHITEBOARDS

The following diagrams have forces at an ANGLE Forces at an angle have x and y components X component = Fcos(θ) Y component = Fsin(θ) Example: X = 25cos(30) Y = 25sin(30) 30 25N

Forces WHITEBOARDS 30 30N 15N

Forces WHITEBOARDS 45 50N 45 50N

Forces WHITEBOARDS 30 40N 25N 34.64N

Forces WHITEBOARDS 30 20N

Forces Introduction But Physics is not just imaginary forces with arrows..... Often force problems involve real objects, with actual forces acting on them. We use FREE BODY DIAGRAMS to show these forces

Forces Introduction W Weight (Gravity): Always directly downward. W = mg m = mass g = gravity FNFN Normal: A surface pushes perpendicular against an object. F N is Equal and Opposite of the sum of all downward forces FfFf Friction: A force that prevents/goes against (dampens) motion Will change depending on the surface. FTFT Tension: A PULL in the direction of a rope or a wire Pulled Object: Value will be given Hanging: F T is Equal and Opposite of the sum of all downward forces F Applied Force: A force can be a push or pull applied to an object Fx = Fcos(θ) Fy = Fsin(θ) * θ = Angle from the horizontal*

Forces Introduction How to Solve Equilibrium Problems: 1) Add up the X forces (including x components) 2) Add up the Y forces (including y components) 3) Find the RESULTANT VECTOR.

Forces Introduction A man pulls a 300kg box at CONSTANT VELOCITY across the floor. He applies a 600N force at an angle of 30°. What is the FRICTION FORCE? Include a magnitude and direction (left or right). Free Body:

Forces Introduction: Example 2 (in your notes..1 page) 1) A person pulls on a 50 kg desk with a 200N force acting at 30° angle above the horizontal. The desk does not budge. a. Determine the value of the frictional force b. Determine the value of the normal force.