Identify the correct sequence of events that take place when an external force acts on a block (at rest) kept on a rough surface.
A. The block starts moving.
B. Static friction starts acting on the block.
C. Kinetic friction acts on the block.
D. The block continues to be stationary.
Sliding/dynamic friction
When an external force acts on a block (at rest), to oppose this force, friction comes into play. However, the type of the frictional force that acts on the block depends on the motion of the body. The following would be the sequence of events that happen in this case.