Parts of a machine that move or rotate quickly on another surface wear out due to:
100 N
111.1 N
155.5 N
2000 N
Parts of a machine that move or rotate quickly on another surface wear out due to friction. Therefore oil or grease is used to reduce friction.
A pulley has 5 pulleys in all and is 90% efficient. If the effort required to lift a load is 1000 N, find the resistance due to the movable parts of machine and friction.
A block and tackle system has 5 pulleys and is 90% efficient. If the effort required to lift a load is 1000 N, find the effort required.
A force of 10 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be: