Snapshot sketches at three sequential instants of time (, , ) show a wooden block sliding to rest on a table as observed in Sec. IV-C of SDI Lab #1, Newton's First and Third Laws. The force f is the frictional force exerted on the block by the table. N is the normal force exerted on the block by the table. F is the force exerted on the block by the Earth. The V–H axis designates the vertical and horizontal directions.
A nervous student prepares to yank a tablecloth.
Four phases of the motion of the plate (shown here as a block so as to facilitate the placement of vectors — see below): (a) plate and cloth stationary with respect to (wrt) the lab frame; (b) plate stationary wrt the accelerating cloth; (c) plate slips wrt the accelerating cloth; and (d) plate slides on the table.
Velocity, acceleration, and force vectors for phases a, b, c, and d of the motion of the plate.
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