8/9/2019 Centripetal Force Practice Problems.doc

1/1

Centripetal Force Practice Problems  Name:Physics Period:

1. A force that pushes forward on an object speeds the object up. A force that pushes backwards slowsthe object down. What effect does a force that is perpendicular to the objects motion do!

". What is a centripetal force!

#. For each of the followin$ situations% identify the specific force that is pro&idin$ the centripetal force:a' A car dri&es around on a flat circular track 

 b' A child rides on a merry($o(roundc' A child is spun in a circle until their feet lea&e the $round

d' A child on a tire swin$ swin$s in a circular path

e' )he clothes in your clothes washer $o throu$h the spin cyclef' *our do$ runs in circles around you while you hold onto the leash.

+. An ,-- k$ car dri&es with a constant speed of - m/s on a circular track with a diameter of "-- m.a' 0ow uickly is the car acceleratin$ as it continuously turns!

 b' 0ow much centripetal force is needed to make the car turn! What specific force is pro&idin$ it!

c' What is the minimum coefficient of friction to keep the car from skiddin$ off the track!

. A -.---1 k$ beetle stands on the turntable of a record player while it is turnin$ at + rpm 2re&olutions per minute'. )he beetle is standin$ 1- cm from the center of the turntable.

a' What is the beetles speed as the turntable spins! 20int: find the distance tra&eled and the time for one re&olution'

 b' 0ow uickly is the beetle acceleratin$ as it keeps turnin$!

c' 0ow much centripetal force is needed to make the beetle turn! What specific force is pro&idin$ it!

3. A toy airplane on the end of a m lon$ strin$ flies in a hori4ontal circle at 5 m/s.a' 0ow uickly is the airplane acceleratin$ as it chan$es direction!

 b' 6f the tension in the strin$ is ".+ N% how massi&e is the airplane!

5. *our #- k$ do$ is runnin$ at 1- m/s on the end of a # m leash. 0ow hard do you ha&e to pull on the

leash to keep your do$ from runnin$ away!

,. 7e&in is playin$ on a merry($o(round in a park. 0e is han$in$ on to the railin$ at the ed$e of the

merry($o(round% 1. m from the center.

a' 6f 7e&in has a mass of 3 k$% and the railin$ pulls him in with "3- N% how fast is he mo&in$! b' 0ow lon$ will it take him to make one complete re&olution around the merry($o(round! 20int: 0ow

far does he ha&e to tra&el to $o around the circle!'

Challen$e

8. *ou $o on the floor drop ride in a local amusement park. 6n the ride% you stand alon$ the walls of a

$iant drum 2 m radius'% which is rotated at fairly hi$h speed. 9nce you are spinnin$ at full speed% the

floor is dropped out from underneath you% but you dont fall with it. 6f the coefficient of friction

 between you and the wall is -.,% how fast does the drum need to be spinnin$ for you to stay up when thefloor drops! uess your mass as best you can to use in the calculation. 20int: )hink about what force

makes you spin in a circle with the drum and how that is connected to the friction.' Answer: 7.83 m/s