Physics Principles and Problems 2009

Section 5.3 : Force and Motion in Two Dimensions

Self-Check Quizzes

1
An object in _____ is motionless or moves with constant velocity.
A)equilibrium
B)stasis
C)suspended animation
D)constant acceleration
2
The force that puts an object in equilibrium is called the _____.
A)constant
B)coordinate
C)equilibrant
D)stabilizer
3
A 75-kg person on skis is going down a hill sloped at 30.0°. The coefficient of kinetic friction between the skis and snow is 0.15. How fast is the skier going 10.0 s after starting from rest?
A)36 m/s2
B)36 m/s
C)78 m/s2
D)78 m/s
4
Two forces are exerted on an object. A 43-N force acts exactly 240° and a 67-N force acts at 300°. What are the magnitude and direction of the equilibrant?
A)96 N at - 83°
B)96 N at 97 °
C)96 N at 7 °
D)84 N at 97 °
5
A 475-N truck is sliding down a plane inclined at 40° above the horizontal. Calculate the magnitude of the acceleration.
A)6.29 m/s
B)6.29 m/s2
C)7.51 m/s2
D)62.9 m/s2
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