As part A moves to the left. gear C will turn

Plz explain

As part A moves to the left. gear C will turn "first in direction 1 and then in direction 2".

Explanation:

A gear, a cylinder or wheel connected to another tooth element to transfer motion or change speed or direction. The gears are connected to the rotating shaft driven by an external forces. Both gears can be connected by direct contact or by a chain or belt.

When the gears are connected by a chain or belt, they move in the same direction. When the gears are in contact (pressed against each other), adjacent gears move in the opposite direction. So, when referring the attached figure gear C would get rotated in direction 1 and then in direction 2 at the time of left side movement of Part A.

2b2t

explanation:

2b2t

no. dot product   =0 when vecs at right angles