In the diagram, the gravitational force acting on the block is decomposed into Fparallel and Fperpendicular. The force Fparallel is along the incline plane, and the force Fperpendicular is perpendicular to the incline plane. There are two additional forces acting on the block. 1. Frictional force, Ff (along the incline plane, opposing the motion of the block) 2. Normal force, FN (perpendicular to the incline) Draw and label Ff and FN on the diagram. If the block is at rest, what does it say about the net force acting on the block? Write down two force equations showing the net force on the block when the block is at rest. (hint: one equation for the direction along the incline, and one equation for the direction perpendicular to the incline.)

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Applications Of Reflection Of Light

When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.

Sign Convention for Mirrors

A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.