Force Problems involving Friction. What is Friction?  It is a force that opposes motion.  Friction is caused by the contact (rubbing) of 2 surfaces.

Slides:

Advertisements

Similar presentations

How does friction affect motion?

Advertisements

Why does the box stop? F=MA.

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.

Forces and Friction Week of October 15th. What is a force?  A push or a pull exerted on an object in order to change the motion of the object; force.

Friction Acts in direction of plane (i.e. up or down the table) Factors affecting friction Limiting friction F lim =  R.

STATIC AND KINETIC FRICTION Lesson 3. What is Friction It is a force that acts to stop the movement of two surfaces in contact. It always acts in a direction.

Friction. ACTIVITY!!! Types of Fingerprints ArchesLoops Whorls.

Force and Gravity.

Μ must be kidding!. * The Force of Friction depends on: * The surfaces in contact * The amount of the normal force * Whether the object is moving (kinetic)

Chapter4 RESISTANCE. Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force.

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.

Physics is a drag!.  The force that resist motion  Represented by symbol F f  Measured in Newtons  Acts parallel to the surface in contact  Acts.

Friction By Dr.Ajay Kumar Reader School of Physical Education, DAVV Indore.

Force Physical Science 12 Basic 5

Friction The force between two surfaces in contact that causes a resistance of the motion or pending motion between the surfaces.

Friction Friction Problem Situations Chapter 5.2 and 5.3.

Friction. A World Without Friction… Friction A force that resists motion Occurs due to the attraction between particles.

Friction Friction always opposes motion or the applied force (called a non-conservative force) Force due to the rubbing of two surfaces against each other.

10.3 Force I can: -recognize force as a vector quantity that has both magnitude and direction. -describe friction as a force that opposes sliding between.

Friction A force that opposes motion. Causes Of Friction Matter is not as smooth on its surface as it appears to be; tiny irregularities get “stuck”

 Friction is a resistive force caused by two surfaces sliding across each other.  Always acts opposite the direction of motion.

4.8 Friction and inclines.

Chapter 5 Matter In Motion

C. Friction Friction  force that opposes motion between 2 surfaces  depends on the: types of surfaces force between the surfaces.

Friction. Definition of Friction Friction is a force that opposes the direction of motion of an object.

Friction Friction is the force that opposes motion whenever one surface moves or tends to move with reference to another surface. Static Friction (F s.

Physics is a drag!.  The force that resist motion  Ff  Measured in Newtons  Acts parallel to the surface in contact  Acts opposite to the direction.

Chapter 12 What You Will Learn Friction Magnitude (size)

Force: push or pull  all forces have size and direction  measured in Newtons (N) An object will speed up, slow down, or turn Only if something is pushing.

Chapter 3.3 Friction. Question #1 Friction is resistance force. Friction is defined as the force that opposes the sliding or rolling motion of two surfaces.

Notes: Friction Static friction (F s ) is the force that opposes initial motion between two contacting surfaces. (standing friction) When a force is applied.

PLEASE TAKE OUT YOUR HOMEWORK. Friction - a force that opposes motion, or “pushes back” when two surfaces are touching. It’s always around and it affects.

 When the net force equals O N, forces are said to be ________________.

Coefficients of Friction Static vs. Kinetic. Static Friction The force that opposes the start of motion between two objects in contact with one another.

Friction The force that opposes motion Depends on: Type of surface (material) Type of surface (material) Mass of object Mass of object.

Tuesday Quiz What’s the difference between mass and weight? Find weight of a) 23-kg dog; b) 35-g coin c) 18-lb chicken Find mass of a) 15-lb turkeyb) 120-N.

F f = . F norm Friction “  ” is the coefficient of friction…it represents the types of surfaces that are in contact with each other.

Friction. I. Friction A. Background 1. A force that acts opposite the direction of movement 2. Friction slows you down and causes heat.

SPH3U – Unit 2 Friction.

Notes: Friction Static friction (Fs) is the force that opposes initial motion between two contacting surfaces. (standing friction) When a force is applied.

How does friction affect motion?

Coefficients of Friction

How does friction affect motion?

MOTION & FORCE.

How does friction affect motion?

FRICTION A force that resists the movement or tendency to move between two objects in contact

Friction Friction is a force that opposes motion between two surfaces that are in contact Frictions occurs because surfaces are covered with microscopic.

Unit 2 Force & Motion Ch 5 Sec 3 Friction.

Chapter 5 Matter In Motion

FRICTION The force between two objects in contact that opposes the motion of either object. Friction is oppositional or resistance force Friction depends.

How does friction affect motion?

2.2 Types of Forces gravity law of universal gravitation weight

Engineering Mechanics

How does friction affect motion?

Chapter 10-2 Friction and Gravity.

Warm up What do you think causes friction? What are some high friction surfaces? Some low friction surfaces?

Bell Work: Friction Details

Newton's Second Law F=m/a Static Friction Sliding Friction

Static and Kinetic Friction

Chapter 1 The Source of Friction

Friction Ff =  . Fnorm “” is the coefficient of friction…it represents the types of surfaces that are in contact with each other.

Presentation transcript:

Force Problems involving Friction

What is Friction?  It is a force that opposes motion.  Friction is caused by the contact (rubbing) of 2 surfaces.  The roughness of the surfaces involved is related to amount of friction. This goes to the atomic level.  When drawing a vector for friction, it should always point in the direction opposite of the movement.

The Direction of Friction

Friction and the Normal Force When the normal force increases, the area of contact between the two objects also increases, This causes the frictional force to increase as well.

Static and Kinetic  Static friction (f s ) refers to an object that is moving. It does two things:  Prevents an object from moving (sliding)  Resists the initiation of movement  Static friction is usually stronger than kinetic friction.  Kinetic friction (f k )refers to the force friction on an object in motion.  There are two types: sliding and rolling.

The Coefficient of Friction  The coefficient of friction ( μ ) is the ratio of the frictional force divided by the normal force.  It increases for rougher surfaces, and decreases for smoother surfaces.  It has no unit of measurement. μ = f/F N f = μ F N