Recent content by daigiaga1994

yeah, but I wonder that Why the following pulley can rotate with a constant velocity with a torque( due to friction exerted by the belt) ? ( In this case, assuming that the friction between shaft and pulley is negligible ). Thank you.

But I think, the effect of the belt on the following pulley are the friction forces ( tangent to the pulley) and the press forces ( normal to the pulley). So only friction forces can create the torque on the pulley. That is my thought.

Consider the belt drives, the driven pulley: diameter d1, angular velocity w1 and the follow pulley: diameter d2, angular velocity w2. Assuming that the driven pulley rotate with a constant angular velocity and the belt does not slip on the pulleys, we have w1/w2=d2/d1, so w2 is constant(...

Thank you so much Doc Al. Now i know what is the work done by the system. Hope that i can learn more from you. Thank again :D

I think it is not important if F is constant or not. Because we can represent the work done on the system by W1=∫Fdx. In my opinion, W2 is the work done by the system, so it is done by the spring force ( This is only force created by the system) and equals to W2=-1/2kx2. If the two equation is...

Consider a system with a spring and a block. The block moves on a frictionless surface. At the equilibrium position, the speed of the block equals to 0. Now i pull the block by a force F with a displacement of x. Assuming that the speed at the final position is v. Can you calculate the...