Solid cylinder roll physics

  • Thread starter gamer1319
  • Start date
  • #1
12
0

Homework Statement



A solid cylinder of radius 20cm is released from a 2.5 high incline. If it rolls down without losing any energy to friction, find the cylinder's velocity at the bottom of the incline and the angular speed at the bottom of the incline.

Homework Equations





The Attempt at a Solution



I need to be given a mass to solve this! If I had a mass, I'd plug it into I = mr^2, find the inertia. With that, I'd plug it into E = mgh, and after i'd find W (angular velocity). Help!
 

Answers and Replies

  • #2
Nabeshin
Science Advisor
2,205
16


Are you sure the masses don't cancel out? :)
 
  • #3
SammyS
Staff Emeritus
Science Advisor
Homework Helper
Gold Member
11,359
1,032


Homework Statement



A solid cylinder of radius 20cm is released from a 2.5 high incline. If it rolls down without losing any energy to friction, find the cylinder's velocity at the bottom of the incline and the angular speed at the bottom of the incline.

Homework Equations





The Attempt at a Solution



I need to be given a mass to solve this! If I had a mass, I'd plug it into I = mr^2, find the inertia. With that, I'd plug it into E = mgh, and after i'd find W (angular velocity). Help!
The mass is m. You don't need to know the mass with this problem any more than you need to know the mass of an object to find its final speed after falling 2.5 meters, if it was released at rest.

Don't forget, the final Kinetic Energy, KE, includes a rotational part as well as a translational part, i.e. KE = (1/2)·I·ω2 + (1/2)·m·v2 .
 

Related Threads on Solid cylinder roll physics

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
8
Views
9K
  • Last Post
Replies
2
Views
406
  • Last Post
Replies
3
Views
548
  • Last Post
Replies
5
Views
16K
  • Last Post
Replies
12
Views
5K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
9
Views
2K
Top