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Practice Problems # 4
1.
A 15.0 kg box is released on a 32º incline and accelerates down the incline at 0.30 m/s
2
.
Find the friction force impeding its motion.
What is the coefficient of kinetic friction?
2.
A projectile is fired with an initial speed of 65.2 m/s at an angle of 34.5º above the
horizontal on a long flat firing range.
Determine a) the maximum height reached by the
projectile, b) the total time in the air, c) the total horizontal distance covered (that is, the
range), and d) the velocity of the projectile 1.50 s after firing.
3.
A wooden block is cut into two pieces, one with three times the mass of the other.
A
depression is made in both faces of the cut, so that a firecracker can be placed in it with
the block reassembled.
The reassembled block is set on a roughsurfaced table, and the
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 Summer '08
 GLAB
 Force, Friction

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