The problem of friction work is common in physics teaching in universities and middle schools, and it is also a key and difficult point in physics teaching. This paper derives the expression of the friction work to object on an arbitrary rough curved orbit, and takes quarter arc track and parabolic track as examples, analyzing the characteristics of the velocity, support force, and friction work with angle during the sliding process, discussing the impact of the dynamic friction factor on the three, and calculating dynamic friction factor which makes the object exactly stops at the lowest point of the two tracks above, to enrich students' understandings.

In this paper, the effects of air buoyancy, air resistance and Magnus force on the basketball in the shooting movement are considered, the dynamics model of basketball motion is established, and the trajectory equation of the basketball movement under various circumstances such as forward spin and back spin are calculated. The trajectory of the basketball is solved and drawn by Matlab software and the influence of air resistance, Magnus force, angular velocity and projection angle on the shooting height, range and trajectory of basketball are discussed. On the basis of theoretical analysis, the software Tracker is used to conduct experiments to obtain the trajectory of basketball movement and related parameters in the real shooting process, which indicates that the theoretical analysis is in good agreement with the experimental data.