November 4November 4 physicsphysicsGateway High School Olycasts

Table of Contents#. Date Title-Page – Page Number20. October 5/6 Newton’s Laws - 5321.October 7/8 Newton’s Law Problems – 5522. October 11/12 Newton’s Second Law Lab - 5823. October 14/15 Newton’s Second Law Lab II - 61

24. October 18/19 Newton’s Law Quiz - 6325.October 20/21 Friction – 6526.October 22/November 1 Friction II - 6827.November 2/3 Mu of the Shoe Lab- 7328.November 5 Friction Quiz- 75

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In: A 3 kg book slides In: A 3 kg book slides across a table and across a table and decelerates to a decelerates to a stop. The stop. The acceleration is -5 acceleration is -5 m/sm/s22..

What is the force of What is the force of friction on the table?friction on the table?

What is the What is the µ of the µ of the table/book table/book combination?combination?

Objective:Objective:To Show our To Show our

understanding of the force understanding of the force of frictionof friction

Success criteria:Success criteria:To be able to solve friction To be able to solve friction

equations using Fequations using Fff, F, Fnn, and , and μμ

Lab ResultsLab Results

Which type of shoe had the Which type of shoe had the highest mu? Why was that?highest mu? Why was that?

Turn in homework and lab write Turn in homework and lab write upsups

Ignoring the slippery Ignoring the slippery when wet sign, a 150 when wet sign, a 150 kg man steps kg man steps carelessly. What is carelessly. What is the coefficient of the coefficient of friction if the force of friction if the force of friction was 25 N?friction was 25 N?

A glacier has a mass A glacier has a mass

of 5x10of 5x1010 10 kg and kg and

moves at a constantmoves at a constant

velocity of .5 m/day.velocity of .5 m/day.

If the force of friction between glacier If the force of friction between glacier and rock is .2, what is the force of and rock is .2, what is the force of friction scraping the rock below the friction scraping the rock below the glacier?glacier?

Slip tech is a product that treats Slip tech is a product that treats surfaces to make them less slippery. If surfaces to make them less slippery. If a 200 kg man stepped on each of a 200 kg man stepped on each of these materials, how much more force these materials, how much more force of friction would he have with this of friction would he have with this product?product?

A 20 N block is being pushed A 20 N block is being pushed across a horizontal table by across a horizontal table by an 18 N force. If the an 18 N force. If the coefficient of kinetic friction coefficient of kinetic friction between the block and the between the block and the table is 0.4, find the table is 0.4, find the acceleration of the block.acceleration of the block.

A 55 N block is being pushed A 55 N block is being pushed across a horizontal table by across a horizontal table by an 25 N force. If the an 25 N force. If the coefficient of kinetic friction coefficient of kinetic friction between the block and the between the block and the table is 0.2, find the table is 0.2, find the acceleration of the block.acceleration of the block.

A 20 N block is being pushed across a A 20 N block is being pushed across a horizontal table by an 18 N force. If horizontal table by an 18 N force. If the coefficient of kinetic friction the coefficient of kinetic friction between the block and the table is between the block and the table is 0.4, find the acceleration of the 0.4, find the acceleration of the block.block.

a) 0.5 m/sa) 0.5 m/s22

b) 1 m/sb) 1 m/s22

c) 5 m/sc) 5 m/s22

d) 7.5 m/sd) 7.5 m/s22

e) 9 m/se) 9 m/s22

Friction VideoFriction Video

QuizQuiz

OOOOOO

What still What still confuses confuses you about you about friction?friction?

Out: