Impulse with Variable Forces Video Lessons

Concept

# Problem: A 2.0 kg object is moving to the right with a speed of 1.0 m/s when it experiences the force shown in the figure. What are the object’s speed and direction after the force ends?

###### FREE Expert Solution

For an F-t graph, the area under the curve gives the change in momentum.

The change in momentum is referred to as impulse.

$\begin{array}{rcl}\mathbf{∆}\mathbf{P}& \mathbf{=}& {\mathbf{F}}_{\mathbf{x}}\mathbf{∆}\mathbf{t}\\ \mathbf{m}{\mathbf{v}}_{\mathbf{f}}\mathbf{-}\mathbf{m}{\mathbf{v}}_{\mathbf{0}}& \mathbf{=}& {\mathbf{F}}_{\mathbf{x}}\mathbf{∆}\mathbf{t}\end{array}$

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###### Problem Details

A 2.0 kg object is moving to the right with a speed of 1.0 m/s when it experiences the force shown in the figure.

What are the object’s speed and direction after the force ends?