FRICTION A force that resists the movement or tendency to move between two objects in contact http://eschooltoday.com/science/forces/images/frictional-force-illustration.jpg.

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Presentation transcript:

FRICTION A force that resists the movement or tendency to move between two objects in contact http://eschooltoday.com/science/forces/images/frictional-force-illustration.jpg

Draw in the friction vector. Ff

What factors affect friction? the roughness of the surfaces the amount of force being applied to the surfaces http://www.cdn.sciencebuddies.org/Files/6805/6/friction-surface.png

Scroll down to find static friction animation. Simulation Scroll down to find static friction animation.

Static friction force A force is applied but the object doesn’t move No relative motion = net force = 0 The friction force is in the opposite direction of the applied force

Static Friction FN Ff (Ffs) FP FW Net Force = Zero

Kinetic friction force A force is applied and the object moves but friction slows it down The friction force is in opposite direction to the motion Kinetic friction exists between the two moving surfaces Notice: The size of the friction force is smaller than the size of the pushing force when accelerating. http://www.school-for-champions.com/science/friction.ht

Kinetic Friction Accelerating FN Ff (Ffk) FP FW Net Force ≠ Zero

Kinetic Friction Constant Velocity FN Ff (Ffk) FP FW Net Force = Zero

on a horizontal surface Friction equation Ff = μ FN FN = FW on a horizontal surface

Coefficients of Friction μs = coefficient of static friction μk = coefficient of kinetic friction

Static Friction Force Maximum magnitude is Fsf = μs FN Direction = opposite of applied force

Kinetic Friction Force Magnitude is Fkf = μk FN Direction = opposite of applied force

Free Fall The motion of a body when only the force of gravity is acting on the body. Technically only in space. Usually means without a parachute or other devise to slow motion. Includes upward motion after launching force is removed.

Air Resistance When an object moves through air it runs into air molecules. It is a type of friction because it resists the motion of the object.

A special situation The object stops accelerating and travels at constant velocity. FA = FW and Fnet = 0 Terminal velocity

A special situation When the FA = FW Fnet = 0 FA FW

Terminal Velocity https://www.youtube.com/watch?v=p0IZsfzDS4s https://www.youtube.com/watch?v=62sRY_B7krM Scroll down even more

Classwork/Homework Static Friction Problems

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