Objective: SWBAT demonstrate understanding of friction by completing the Marble Roll lab Warm Up: Friction Using F= MA 1.Calculate how much force is needed to make a 10 kg grocery cart accelerate to 3 m/s/s

Announcement Your physics test is MAY 12 (A) or MAY 13 (B) We will review for the test next class HW: Complete the worksheet to prepare for review You will receive a study guide next class

Friction: What is it? Even if you exert a lot of FORCE on an object, it may not go very far FRICTION makes things slow down (think about your balloon cars from last week!) Look back at your Newton’s Laws Foldable

WRITE if you do not have this definition Friction: the force that resists motion between two surfaces that are pressed together You should write down the friction definition if you did not already write it on your Newton’s Law’s foldable

(5-10 minutes) Marble Roll Challenge Part 1 GOAL: Make the marble go the SLOWEST from one end of the table to the other Groups of 4 Planning Draw 3 different plans so you know where to start!

Marble Roll Part 2 Time to BUILD your marble tracks 1.Build all three tracks (one at a time) and test 2. WRITE YOUR TIME TRIALS ON THE BACK OF YOUR SHEET Remember, you want your marble to go the SLOWEST, not the fastest!

Compete! I will time each team’s marble track Remember, you want the SLOWEST time, not the fastest! Answer CONCLUSION questions at the bottom of the sheet