Physics a level question

Watch this thread
IamBadAwful
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 1 month ago
#1
A small body of mass m rests on a horizontal turntable at a distance r from the centre.
If the maximum frictional force between the body and the turntable is –––, what is the
angular speed at which the body starts to slip?
I dont understand how the answer is sqrt(9/2r)
0
reply
Pangol
Badges: 15
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 1 month ago
#2
(Original post by IamBadAwful)
A small body of mass m rests on a horizontal turntable at a distance r from the centre.
If the maximum frictional force between the body and the turntable is –––, what is the
angular speed at which the body starts to slip?
I dont understand how the answer is sqrt(9/2r)
Without knowing what the maximal frictional force actually is, we can't check the answer. But the idea is to think about what is providing the centripetal force when the body is moving in a circle and use that to work out the angular speed when this centripetal force has got as large as it is allowed to. If it moves with a greater angular speed than that, it won't stay in place and move in a circle any more.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest

Does school Maths prepare people well enough for the future?

Yes, it gives everyone a good foundation for any future path (39)
32.23%
Somewhat, if your future involves maths/STEM (55)
45.45%
No, it doesn't teach enough practical life skills (26)
21.49%
Something else (tell us in the thread) (1)
0.83%

Watched Threads

View All