Physics for Engineers (Activity with Answer study guide) PDF

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Physics Activity A � = 100 lb box slides down a frictionless skid inclined at an angle of � = 60 degree with the horizontal. Find (a) the accelerating force �, (b) the time �1 required to travel the first � = 20 ft/sec, and (c) the time �2 required to travel the next 20 ft/sec. Solution: The acceleration force � = �� sin � = 100 × 32.174 × sin 60° = 2786 lbf. The acceleration � =

�

=

�

2786

= 27.86 ft/sec2

100

The time required to travel �1 =

� 2=

�− 0 20 = 0.036 sec. = � 27.86

2� − � �

=

2 × 20 − 20

= 0.036 sec.

27.86

Answers: (a) � = 2786 lbf (b) �1 = 0.036 sec (c) �2 = 0.036 sec

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