Coefficient of Friction

Slides:

Advertisements

Similar presentations

Lesson 4: What is friction?. Period 1 the amount resistance between two objects it happens when two objects rub together can create heat when you rub.

Advertisements

CBA #1 Review Graphing Motion 1-D Kinematics Projectile Motion Circular Motion Gravity Graphing Motion 1-D Kinematics Projectile Motion Circular.

Kinematics- Acceleration Chapter 5 (pg ) A Mathematical Model of Motion.

Newton’s Second Law Physical Science 3.1. Force and Acceleration Greater force = greater acceleration Greater force = greater acceleration Applying force.

This Week’s Lab 11/13/13 – 11/15/13. Title [Title – you need to come up with one] Your name and period.

Motion & Force: Dynamics Physics 11. Galileo’s Inertia  Galileo attempted to explain inertia based upon rolling a ball down a ramp  Predict what would.

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.

THURSDAY, DEC. 11 TH p. 106, 107. THURSDAY, DEC. 11 TH /11/14 Thurs. L.T.: I can write a 3 part hypothesis and a procedure to investigate the average.

CBA #1 Review Graphing Motion 1-D Kinematics

Physical Science State Assessment Review S.HS.2B.1.1.

Friction and Gravity.

Newton’s first law of motion states that the motion of an object changes only if an unbalanced force acts on the object. Newton’s second law of motion.

Chapter 5 Newton’s Second Law of Motion – Force and Acceleration

Rolling Ball. To Start Off Materials Needed: Incline plane (binder), Tennis ball, Baseball, solid object.

Notes from 8/29/13. T-Charts (cont.)  Check Units!  For given information (2), check that same quantities have the same unit (ex. time: s and min should.

Physics Activity #4 9/30/14. Objective:  To measure the acceleration of gravity in the lab, by using two different methods.

Shawnee Mission School District Science Fair. Speed.

Gravity on a Roll Gravity Rules! And Gravity Always Wins.

The Rough and the Smooth

Acceleration of Gravity and Free Fall 9/12/13. Bellwork What is the difference between velocity and acceleration? Velocity is the rate at which an object.

Types of Friction.

Acceleration due to Gravity. Gravity is… acceleration of an object toward the center of the Earth The acceleration of an object toward the center of the.

Forces Newton’s Second Law.

Kahoot. Question 1 A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that.

5.1 Forces in 2-D; Vectors. 5.1 Summary When two vectors are at right angles, you can use the Pythagorean theorem to determine the magnitude of the resultant.

If a 500kg truck is accelerating at a rate of 30 m/s/s, how much force will it take to stop it? Put the items below in order of most inertia to least inertia:

By: Hanna Briestensky Problem Determine how the height from which the ball is dropped, effects how high that the ball will bounce back up.

Friction Ffriction = μFNormal.

ICP TCHS “Motion”. Students who demonstrate understanding can: HS- PS2-1. Analyze data to support the claim that Newton’s second law of motion describes.

By: Will Schubert. Determine how the height you drop a ball from affects the height the ball bounces back up. Problem.

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

Physical Science Forces

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:

Key Concepts What is Newton’s first law of motion? What is Newton’s second law of motion? Key Terms - Inertia.

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.

Frictional Forces This topic may be abrasive. Friction Friction is a force that opposes motion Friction will cause a moving object to slow down and finally.

Newton’s Second Law of Motion Virginia PS SOL.10b.

Question 1 ›Please form a group of 2 or 3 ›Collect a whiteboard from the side of the room ›Make sure to have a calculator and equation sheet out on your.

Kinematic Equations Chapter 2 Section 2. Accelerated Motion  Motion with constant acceleration is what we will mostly look at in this class  Example:

Activity 86: Investigating Center of Mass Warm up: if your crash-dummy is in an accident and the car comes to stop, what will be the motion of the dummy.

Project Presentation Alvaro Giraldo

Chapter 12 Review a d 13 kg b c A box is accelerated to the right across the smooth surface of a table with an applied force of 40 Newtons. The table surface.

The student is expected to:

Friction Static and Dynamic.

TENNIS BALL BOUNCE EXPERIMENT

Cart on Ramp Lab.

The Normal Force and Friction

NEWTON’S SECOND LAW OF MOTION (Ch. 3-1)

Whiteboarding Please form a group of 2 or 3

Ch. 5 slides Forces.ppt.

Physical Science Ms. Pollock

Types of Friction.

Coefficient of Friction

Relative Velocity Pre-Class Friday

Types of Friction.

Ch. 6 slides.ppt Forces2.ppt.

Rolling Friction.

Coefficient of Friction

Coefficient of Friction

Coefficient of Friction

2*7 Frictional Force: The Mu of the Shoe

Pull the spring scale a longer distance.

Warm-Up! If you push horizontally on your textbook with a force of 1-N to make the book slide at a constant velocity, how much is the force of friction.

Accelerated Motion v.

Newton Card Sort Find your cards from last class..

Coefficient of Friction

Presentation transcript:

Coefficient of Friction Setting up and executing an experiment.

QPOE2 What do you know about the given question How will you apply what you found Question Application Knowledge probe Explanation Evaluate Prediction Data Analysis Investigation plan Observation How will you analyze your data How will you investigate the question

QUESTION Which of the following objects has the greatest coefficient of rolling friction between itself and the carpet floor?

What have we learned that would help us answer this question What have we learned that would help us answer this question? Cart project: the cart stopped because of rolling friction between the wheels and the surface of contact (carpet and wooden floor). Without a breaking system, the negative acceleration (deceleration)is constant or uniform. Those that did have a breaking system had greater friction (sliding friction)once the breaking system kicked in.

What have we learned that would help us answer this question What have we learned that would help us answer this question? The coefficient of static and sliding friction activity showed us that we can calculate m by dividing the friction force by the normal force (mass x acceleration due to gravity).

Equations of Motion for Uniform Acceleration Equations Variables vf = vi + at vi vf a t d = ½ (vf + vi) t vi vf d t d = vit + ½ at2 vi a d t vf 2 = vi 2 + 2ad vi vf a d

Knowledge Probe What do we know about friction? How do we calculate the coefficient of friction? Which kinematic equations would help us? What materials do we need? What values are we going to measure? What types of errors should will we encounter? How many measurement should we take?

PREDICTION Which object would have the greatest coefficient of rolling friction between itself and the carpet floor? Why? Justify your prediction.

Investigative plan Determine the procedures with which we can obtain the values needed in the knowledge probe which in turn will answer the QUESTION. Material list: ball, scale, ramp, stopwatch, meter stick, tape, carpeted area, pencil and paper, calculator Procedure: 1. Gather materials 2. Set up a ramp using the hotwheels tracks and books (8 inches high) 3. Release the ball and start the timer when the ball hits the carpet 4. Stop the timer when the ball stop and measure the displacement. 5. Record the data into the table 6. Repeat the experiment 3 times with condition that the values are consistent. 7. 8.

OBSERVATION What values are measured? How many times do we repeat the trials? Object: Tennis Ball displacement time Trial 1 Trial 2 Trial 3 Trial 4 Trial 5

Data analysis What information can be derived from the observation? Object: Tennis Ball displacement time Initial velocity acceleration Trial 1 Trial 2 Trial 3 Trial 4

EVALUATION Using the acceleration that was calculated rom the data analysis, determine the coefficient of friction. Object: Tennis Ball displacement time Initial velocity acceleration Coefficient m Trial 1 Trial 2 Trial 3 Trial 4

EXPLANATION From the evaluation, ______________ has the greatest rolling coefficient of friction. Offer reasons why the object has the greatest rolling friction. 1. 2. 3. 4.