# Do Now Complete the Do Now on your

- Slides: 27

Do Now Complete the Do Now on your Daily Organizers

Do Now • You are at the bottom of the loop of a roller coaster moving 30 m/s. The loop has a radius of 50 m and coaster cart is a mass of 850 kg. A. What are the two forces working on you at the bottom of the loop and what direction are they working in? Do not count centripetal. B. What direction is the centripetal (net) force? C. What is the centripetal force in this problem? D. What is the weight of the cart? E. What is the magnitude of the other force?

Today’s Agenda 5 min • Do Now 5 min • Important Dates 40 min • Circular Motion: Step Further 5 min • Exit Ticket

Today’s Agenda 5 min • Do Now 5 min • Important Dates 40 min • Circular Motion: Step Further 5 min • Exit Ticket

Important Dates & Reminders • Quarter 2 Ends • THIS Thursday • College Tours • Revised Dates • Concession Sign-Ups • Ole Miss Permission Slip • Next Home Basketball Game • Tomorrow vs. City Univ.

Today’s Agenda 5 min • Do Now 5 min • Important Dates 40 min • Circular Motion: Step Further 5 min • Exit Ticket

Identifying Fc

Identifying Fc • Net Force is working inwards • Frictional force gives the centripetal force to move in a circle • What happens on icy roads? • When you calculate Fc you are actually calculating the frictional force too!

Identifying FC

Identifying FC : Practice Given Info: m = 864 kg atop = 15. 6 m/s 2 , down abottom = 26. 3 m/s 2 , up Find: Fnorm at top and bottom

Identifying Fc: Ice Skating

Circular Motion Pictures Follow this link

Group Acceleration Problem • During their physics field trip to the amusement park, Le. Resha and Brendon took a ride on the Whirligig. The Whirligig ride consists of long swings which spin in a circle at relatively high speeds. As part of their lab, Le. Resha and Brendon estimate that the riders travel through a circle with a radius of 6. 5 m at a speed of 7 m/s. Determine the centripetal acceleration of the riders on the Whirligig.

Think-Pair. Share Problem

Think-Pair-Share Problem • The tallest Ferris wheel in the world is located in Singapore. Standing 42 stories high and holding as many as 780 passengers, the Ferris wheel has a diameter of 150 meters travels in a circle at about 0. 25 m/s. Determine the centripetal acceleration of riders on the Singapore Flyer.

Independent Problem • Elmira, New York boasts of having the fastest carousel ride in the world. The merry-go-round at Eldridge Park takes riders on a spin at 8. 0 m/s. The radius of the circle about which the outside riders move is about 7. 4 m. Determine the acceleration of the riders.

Group Problem • Clifton is the star discus thrower on MASE's varsity track and field team. In last year's regional competition, Clifton whirled the 1. 6 kg discus in a circle with a radius of 1. 1 m, ultimately reaching a speed of 52 m/s before launch. Determine the net force acting upon the discus in the moments before launch.

Independent Problem • Jasmyne is in her Toyota Camry and trying to make a turn off an expressway at 19. 0 m/s. The turning radius of the level curve is 35. 0 m. Her car has a mass of 1240 kg. Determine the net force on her car as she rounds the curb.

Sage & Scribe Problem

Sage & Scribe Problem • Ms. Kemal does a demonstration with a bucket of water tied to a 1. 3 -meter long string. The bucket and water have a mass of 1. 8 kg. Ms. Kemal whirls the bucket in a vertical circle such that it has a speed of 3. 9 m/s at the top of the loop and 6. 4 m/s at the bottom of the loop. Determine the acceleration and net force of the bucket at the top of the loop.

Tag Team Problem

Tag Team Problem • Ms. Kemal does a demonstration with a bucket of water tied to a 1. 3 -meter long string. The bucket and water have a mass of 1. 8 kg. Ms. Kemal whirls the bucket in a vertical circle such that it has a speed of 3. 9 m/s at the top of the loop and 6. 4 m/s at the bottom of the loop. Determine the acceleration and net force of the bucket at the bottom of the loop.

Challenge Problem • Brandon is driving his 1500 -kg Camaro through a horizontal curve on a level roadway at a speed of 23 m/s. The turning radius of the curve is 65 m. Determine the minimum value of the coefficient of friction which would be required to keep Brandon's car on the curve.

Challenge Problem • Celetra (m=62 kg) is riding the Demon roller coaster ride. The turning radius of the top of the loop is 12 m. Celetra is upside down at the top of the loop and experiencing a normal force which is one-half of her weight. Draw a free body diagram and determine Celetra's speed.

Exit Ticket • Exit tickets will be my daily way of seeing whether or not you have understood the objectives we have gone over during class each day. • They will NOT be graded for accuracy but WILL be graded for completion so make sure you always try each and every question. • These exit tickets must be done silently and independently. If you violate this, you will lose your participation points for the day. • You must wait to begin your exit ticket until Ms. Kemal says to begin.

Exit Ticket • A fullback is running a sweep around the left side of the line. As he rounds the turn, he is momentarily moving in circular motion, sweeping out a quarter-circle with a radius of 4. 17 meters. If the 83. 5 -kg fullback makes the turn with a speed of 5. 21 m/s, then what is his acceleration and the centripetal force working on him?