A 1.2 kg block is released from rest at point A and follows the curved guide as
ID: 2216448 • Letter: A
Question
A 1.2 kg block is released from rest at point A and follows the curved guide as indicated. At point A this block is located 2.2 m higher than at point B. There is no friction between the block and the guide except between points B and C. The distance between points B and C is 2.5 m. At point C the block is moving with speed of 3.5 m/s.
a) Find kinetic energy of the block at point B.
b) Find kinetic energy of the block at point C.
c) Find friction force acting on the block between points B and C.
d) The 1.2 kg block then strikes a stationary 2.4 kg block at point C and sticks to it. At what speed do the blocks move off to the right?
Explanation / Answer
1) kinetic energy at b =1.2*2.2*10=26.4 2)kinetic enrgy at c=.5*1.2*3.5^2=7.35 3) loss in ke = 26.4-7.35 =19 force = 19/2.5=7.62
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