Static Friction And Sliding friction Per. 6

Friction Friction is a force that opposes the motion of objects that touch as they move past each other. The denotation of Friction is, μ. Below are the steps and formula for friction: Formula: Steps: Question 1: A boy is pulling box of mass 10 Kg. What is the normal force acting and also find the frictional force if the coefficient of friction is 0.3? Given: Mass, m = 10 Kg,            Normal force, Fn =?  Normal force is given by Fn = mg                                          = 10 Kg × 9.8 m/s2                                          = 98 N. The Frictional force is given by Ff = μ Fn                                                   = 0.3 × 98 N.                                                  = 29.4 N. Luis Ruiz, Destiny Carney, and Crystal Clarke

Static Friction Static friction is the friction force that acts on objects that are not moving. Static Friction always acts in the direction opposite to that of the applied force. The denotation of static friction is, μs. Below are the steps to finding static friction and the formula: Formula: Steps: A mass is resting on a flat surface which has a normal force of 98N, with a coefficient of static friction of 0.35. What force would it take to move the object? N = 98N, μs = 0.35 Substitute the values in the below static friction formula:

Sliding Friction Sliding Friction is a force that opposes the direction of motion of an object as it slides over a surface. Because sliding friction is less than static friction, less force is needed to keep an object moving than to start it moving. The denotation of sliding friction is, μ.

Friction Examples: Walking: we could never walk without friction. We would have been slipping in one place.  Rubbing hands together: We rub our hands together to keep them warm in winter. The warmth is generated by friction.  Brakes: Brakes help to stop a vehicle in motion. Braking increases friction Luis Ruiz, Destiny Carney, and Crystal Clarke

Static Friction Examples: Throwing something:  Static: The object does NOT slip while in your hand Hitting a Tennis Ball:  Static: the ball is not spinning, hits the racket and leaves without spin or Your racket puts a spin on the ball without slippage Running:  Static: Your foot does NOT slip while in contact with the ground

Sliding Friction Examples: Rubbing both hands together to create heat A sled sliding across snow or ice Skis sliding against snow A person sliding down a slide is an example of sliding friction A coaster sliding against a table A washing machine pushed along a floor An iron being pushed across material The frame and the edge of door sliding against one another

Static Friction Friction Sliding Friction 10 10 10 20 20 20 30 30 30 40 40 40 50 50 50

Static Friction Questions and Answers!

Static Friction 10 Static Friction question for 10 points: What is Static friction? 10

Static Friction 10 Static Friction answer for 10 points: Static friction is friction between two or more solid objects that are not moving relative to each other. 10

Static Friction 20 Static Friction question for 20 points: What was the denotation of Static Friction? 20

Static Friction Static Friction answer for 20 points: μs 20

Static friction 30 Static Friction question for 30 points: What was one of the three examples? 30

Static friction 30 Static friction answer for 30 points Throwing something:  Static: The object does NOT slip while in your hand Hitting a Tennis Ball:  Static: the ball is not spinning, hits the racket and leaves without spin or Your racket puts a spin on the ball without slippage Running:  Static: Your foot does NOT slip while in contact with the ground 30

Static friction 40 Static friction question for 40 points: What is the formula for static friction? 40

Static Friction Static Friction answer for 40 points: 40

Static friction: 50 Static Friction question for 50 points: What does static friction do? 50

Static Friction 50 Static Friction answer for 50 points: It makes sure that you don’t slip or fall. 50

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