Physics Principles and Problems 2009

Chapter 5: Forces in Two Dimensions

Standardized Test Practice

1
If you exert 35 N of horizontal force while pushing a 15-kg box across the floor at a constant velocity, what is the coefficient of kinetic friction between the floor and the box?
  Need a Hint?
A)0.044
B)0.24
C)0.43
D)4.2
2
How much force against friction is required to begin moving a 15.2–kg wood crate across a polished wood floor? The coefficient of static friction is 0.500, and of kinetic friction is 0.200.
A)298 N
B)74.5 N
C)29.8 N
D)3.04 N
3
How much force against friction is required to keep a 15.2-kg wood crate moving across a polished wood floor? The coefficient of static friction is 0.500, and of kinetic friction is 0.200.
A)298 N
B)74.5 N
C)29.8 N
D)3.04 N
4
A crate slides down a hill sloped at 35.0°. The coefficient of kinetic friction between the hill and the crate is 0.60. How fast is the crate going after 10.0 s?
A)0.80 m/s
B)24 m/s
C)56 m/s
D)8.0 m/s
5
The free-body diagram represents a 227-kg piano resting on an inclined plane. What is the component of the weight parallel to the inclined plane?

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A)11.4 N
B)11.6 N
C)1110 N
D)1930 N
6
The free-body diagram represents a 227-kg piano resting on an inclined plane. What is the component of the weight perpendicular to the inclined plane?

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A)11.4 N
B)11.6 N
C)1110 N
D)1930 N
7
A vector makes an angle, θ, with the horizontal. The horizontal and vertical components of the vector will be equal in magnitude if angle θ is ______.
A)30°
B)45°
C)60°
D)90°
8
The net force on an object is zero. What must be true of this object?
  Need a Hint?
A)The object is not moving.
B)The object is weightless.
C)There must be no frictional forces acting on the object.
D)The object's velocity is constant.
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