Presentation is loading. Please wait.

Presentation is loading. Please wait.

Friction. Friction is a force that opposes motion Friction can never cause motion Friction can prevent motion or inhibit the continuation of motion Friction.

Published byTyrone Jennings Modified over 9 years ago

Similar presentations

Presentation on theme: "Friction. Friction is a force that opposes motion Friction can never cause motion Friction can prevent motion or inhibit the continuation of motion Friction."— Presentation transcript:

1 Friction

2 Friction is a force that opposes motion Friction can never cause motion Friction can prevent motion or inhibit the continuation of motion Friction can only occur when two surfaces are in contact

3 Friction According to Newton’s 3 rd law, if a force is applied to an object at rest, two things can occur The object will remain at rest if there is enough friction If no motion occurs, then the action force (force applied) must be equal and opposite the reactionary force (force of friction)

4 Friction and Free Body Diagrams Friction is a reaction force according to Newton’s 3 rd Law

5 Static Friction Static friction is occurs when an object is not in motion As an object is pushed, the friction pushes back with an equal but opposite force F A = -F f As the applied force increases, so does the force of friction.

6 Force of friction static max What happens when the applied force finally starts to move the object? This means that there is a “give point” or a “point of maximum stickiness” due to the static friction This maximum is called the force of friction static max It is symbolized by F fsmax

7 Calculating F fsmax F fsmax can be calculated if we know something about the surface contact. Scientist measured the stickiness of surfaces to find relationships of the surface contact to the force of friction The coefficient of static friction is the factor that lets us calculate that maximum stickiness Mu (  s ) is the symbol of the coefficient of static friction

8 Coefficient of Static Friction Only used to tell if an object is moving or not It is unit-less It is usually given in a problem or calculated from the information given in a problem There are large data bases filled with coefficients of friction.

9 Friction and Free Body Diagrams Is it moving? Does the applied force exceed the F fsmax ?

10 Friction and Free Body Diagrams Is it moving?

Download ppt "Friction. Friction is a force that opposes motion Friction can never cause motion Friction can prevent motion or inhibit the continuation of motion Friction."

Similar presentations

Newton’s 1 st and 3 rd Laws. How do you start and stop the motion of an object?

Newton’s 1 st and 3 rd Laws. How do you start and stop the motion of an object?
5. Using Newton’s Laws. Newton’s Third Law 3 Law of Action and Reaction Forces always occur in equal and opposite pairs A B A acts on B B acts on A.

5. Using Newton’s Laws. Newton’s Third Law 3 Law of Action and Reaction Forces always occur in equal and opposite pairs A B A acts on B B acts on A.
Apparent Weight.

Apparent Weight.
“ If I have seen farther than others, it is because I have stood on the shoulders of giants.” Sir Isaac Newton (1642 – 1727) Physicist.

“ If I have seen farther than others, it is because I have stood on the shoulders of giants.” Sir Isaac Newton (1642 – 1727) Physicist.
Newton’s Laws of Motion - 2. Multiple Objects – Example with m 2 > m 1 Draw free body diagrams for each object. In magnitude, a 1 = a 2.

Newton’s Laws of Motion - 2. Multiple Objects – Example with m 2 > m 1 Draw free body diagrams for each object. In magnitude, a 1 = a 2.
READING QUIZ The friction that exist between two contacting surfaces in the absence of lubrication is called _________. A) fluid friction B) normal friction.

READING QUIZ The friction that exist between two contacting surfaces in the absence of lubrication is called _________. A) fluid friction B) normal friction.
Chapter 5 The Laws of Motion. Forces Usually think of a force as a push or pull Usually think of a force as a push or pull Vector quantity Vector quantity.

Chapter 5 The Laws of Motion. Forces Usually think of a force as a push or pull Usually think of a force as a push or pull Vector quantity Vector quantity.
ISAAC NEWTON AND THE FORCE Dynamics. Kinematics vs Dynamics Kinematics – the study of how stuff move  Velocity, acceleration, displacement, vector analysis.

ISAAC NEWTON AND THE FORCE Dynamics. Kinematics vs Dynamics Kinematics – the study of how stuff move  Velocity, acceleration, displacement, vector analysis.
Friction Acts in direction of plane (i.e. up or down the table) Factors affecting friction Limiting friction F lim =  R.

Friction Acts in direction of plane (i.e. up or down the table) Factors affecting friction Limiting friction F lim =  R.
Friction There are many forms of friction. This lesson introduces the force laws for static friction, kinetic friction, and rolling friction. Students.

Friction There are many forms of friction. This lesson introduces the force laws for static friction, kinetic friction, and rolling friction. Students.
More Newton’s Laws Applications

More Newton’s Laws Applications
© 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.

© 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
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.

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.
There are two types of friction. Both always oppose motion. When you pushed your book across the desk, it experienced a type of friction that acts on moving.

There are two types of friction. Both always oppose motion. When you pushed your book across the desk, it experienced a type of friction that acts on moving.
Nahdir Austin Honors Physics Period 2.  Force: A push or pull on an object (something that can accelerate objects.  A force is measured by a Newton.

Nahdir Austin Honors Physics Period 2.  Force: A push or pull on an object (something that can accelerate objects.  A force is measured by a Newton.
Forces Unit 2 Chapter 12.1. What is a Force? A force can cause a resting object to move, or it can accelerate a moving object by changing the object’s.

Forces Unit 2 Chapter What is a Force? A force can cause a resting object to move, or it can accelerate a moving object by changing the object’s.
$200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $ 300 $400 $500 $100 $200 $300 $400 $500 $100 What is a Force? Newton’s.

$200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $ 300 $400 $500 $100 $200 $300 $400 $500 $100 What is a Force? Newton’s.
JEOPARDY Force and motion. Force Motion 2 Motion 2 Newton’s Laws Newton’s Laws of Motion of Motion Newton’s Laws Newton’s Laws of Motion 2 of Motion 2.

JEOPARDY Force and motion. Force Motion 2 Motion 2 Newton’s Laws Newton’s Laws of Motion of Motion Newton’s Laws Newton’s Laws of Motion 2 of Motion 2.
Newton’s 2 nd Law. Enduring Understanding: Studying dynamics (causes of motion) has had a profound effect on the way humans view their world. Essential.

Newton’s 2 nd Law. Enduring Understanding: Studying dynamics (causes of motion) has had a profound effect on the way humans view their world. Essential.
Forces & Motion The Force of Friction. Frictional Forces Frictional forces arise from complex interactions between the surfaces of objects. Even very.

Forces & Motion The Force of Friction. Frictional Forces Frictional forces arise from complex interactions between the surfaces of objects. Even very.

Similar presentations

Ads by Google