- #1
Amit86
- 8
- 0
Hi all,
I'm working on a problem from the Feynman exercise book, and have been racking my brains for an answer, so would really appreciate some help here. The problem seems simple enough:
A ball with a 3cm radius, weighing 1kg rests on an inclined plane (angle alpha) and also touches a vertical wall. Neglect friction.
(see attached diagram)
What is the force of the ball acting on the wall (Fw)?
The answers in the back gives
Fw= tan(alpha) kg.wt
I got the force due to gravity acting down the plane, Fr = 9.81.sin(alpha). The horizontal component of this force, which to my mind is the force acting on the wall, is
Frhor=9.81* sin(alpha)cos(alpha)
What am I missing here?!
Thanks!
Amit
I'm working on a problem from the Feynman exercise book, and have been racking my brains for an answer, so would really appreciate some help here. The problem seems simple enough:
A ball with a 3cm radius, weighing 1kg rests on an inclined plane (angle alpha) and also touches a vertical wall. Neglect friction.
(see attached diagram)
What is the force of the ball acting on the wall (Fw)?
The answers in the back gives
Fw= tan(alpha) kg.wt
I got the force due to gravity acting down the plane, Fr = 9.81.sin(alpha). The horizontal component of this force, which to my mind is the force acting on the wall, is
Frhor=9.81* sin(alpha)cos(alpha)
What am I missing here?!
Thanks!
Amit