A puck slides across frictionless ice with an initial velocity of

PHYSICS · Multi-part · AP · Physics 1: Algebra-based · Linear Momentum · Linear Momentum

Problem

0.25\text{ kg}

puck slides across frictionless ice with an initial velocity of

+6.0\,\text{m\,s}^{-1}

. Beginning at

t=0

, an automated stick applies a net horizontal force according to the schedule below: •

0\le t<0.050\text{ s}:\;F_x=+150\text{ N}

(constant) •

0.050\text{ s}\le t\le0.120\text{ s}:\;F_x=F_2

(constant, directed along

-x

) For

t>0.120\text{ s}

the net horizontal force is zero. The goal is to bring the puck to rest exactly at

t=0.120\text{ s}

. (a) Calculate the impulse delivered to the puck during the first

0.050\text{ s}

interval. (b) Determine the magnitude and direction of

F_2

required to bring the puck to rest at

t=0.120\text{ s}

. (c) Compute the average net force acting on the puck over the entire

0\text{ s}

0.120\text{ s}

interval.