[a]1. The problem statement, all variables and given/known data[/b](adsbygoogle = window.adsbygoogle || []).push({});

The block shown in Fig. 5-27 lies on a smooth plane tilted at an angle = 25.5° to the horizontal, with µk = 0.17.

Figure 5-27

(a) Determine the acceleration of the block as it slides down the plane.

________ m/s2 (down the plane)

(b) If the block starts from rest 9.50 m up the plane from its base, what will be the block's speed when it reaches the bottom of the incline?

_________ m/s

2. Relevant equations

F=m(a)

Ff=Mk(N)

[c]3. The attempt at a solution[/b]

I drew a Vector Diagram so that gravity was pointing directly downward from the box, so that means that the Fg vector is at an angle of -64.5 from the Horizontal, (or 25.5 degrees from the Y axis, whichever you prefer!), and then so Fg has horizontal and Vertical components.

Fy(net)=m(a)=Fa+Fgx-Ff

Ff=.17(Fnormal)

??? I'm very confused..it seems like I need to know the mass to solve the problem, but the other half of me doesn't even know where to begin.

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# Homework Help: Newton's Forces - Block Down An Incline

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