A 50.0 N box sliding on a rough horizontal floor, and the onlyhorizontal force acting on it is friction. You observe that at oneinstant the box is sliding to the right at 1.75 m/s and that is stopsin 2.25 s with uniform acceleration. The force that friction exerts onthis box is closest to:

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9 May 2019

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A 13.5-kg box slides over a rough patch 1.75 m long on a horizontalfloor. Just before entering the rough patch, the speed of the boxwas 2.25 m/s, and just after leaving it, the speed of the box was1.20 m/s.
What is the magnitude of the average force that friction on therough patch exerts on the box?

A 7.06-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.300. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 1.38 m/s2, and (c) accelerating downward with an acceleration whose magnitude is 1.38 m/s2

Consider a box that is placed on different surfaces.

a) In which situation (s) is there no force acting on the box?
b) In which situation (s) is there a static friction force acting on the box?
c) In which situation (s) is there a kinetic friction force acting on the box?

Various possible situations are as under:

I. The box is at rest on a rough horizontal surface.
II. The box is at rest on a rough tilted surface.
III. The box is on the rough-surfaced flatbed of a truck- the truck is moving at a
constant velocity on a straight, level road and the box remains in the same
place in the middle of the truck bed.
IV. The box is on the rough-surfaced flatbed of a truck- the truck is speeding up
on a straight, level road, and the box remains in the same place in the middle of
the truck bed.
V. The box is on the rough-surfaced flatbed of a truck- the truck is climbing a
hill and the box is sliding towards the back of the truck.

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A 50.0 N box sliding on a rough horizontal floor, and the onlyhorizontal force acting on it is friction. You observe that at oneinstant the box is sliding to the right at 1.75 m/s and that is stopsin 2.25 s with uniform acceleration. The force that friction exerts onthis box is closest to:

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