Energy in Connected Objects (Systems) Video Lessons

Example

# Problem: Use work and energy to find an expression for the speed of the block in the following figure just before it hits the floor.(a) Find an expression for the speed of the block if the coefficient of kinetic friction for the block on the table is μk.(b) Find an expression for the speed of the block if the table is frictionless.

###### FREE Expert Solution

In this problem, we are asked to use work-energy relationship.

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbf{∆}}{\mathbf{K}}{\mathbf{E}}}$

ΔK = Kf - Ki

W = -ΔU + Wnc where Wnc is the work done by non-conservative forces in the path.

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###### Problem Details

Use work and energy to find an expression for the speed of the block in the following figure just before it hits the floor.

(a) Find an expression for the speed of the block if the coefficient of kinetic friction for the block on the table is μk.

(b) Find an expression for the speed of the block if the table is frictionless.