Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and beauty - (2013 Hunan Simulation) As shown in the figure, a block with mass m slides down along the inner wall of a hemispherical metal shell with radius R. The hemispherical metal shell is fixed vertically.
(2013 Hunan Simulation) As shown in the figure, a block with mass m slides down along the inner wall of a hemispherical metal shell with radius R. The hemispherical metal shell is fixed vertically.

A. The size of the centripetal force Fn=mv2R. Therefore A is wrong.

B. According to Newton’s second law, N-mg=mv2R, then N=mg+mv2R. So the sliding friction force f=μN=μ(mg+mv2R). Therefore, B is wrong and C is correct.

D. Since the direction of the resultant force of the gravity support force is vertically upward and the direction of the sliding friction force is horizontally to the left, the direction of the resultant force of the object is obliquely upward to the left. Therefore D is correct.

So choose CD.