Practice Test: Forces And Motion

20 Questions  I  By Songj2 on October 17, 2009
Sample test preparation for Forces and Motion unit. 

  
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1.  The free-body diagram below represents a 2000-kg elevator. What is the motion of the elevator if the tension in the cable is 1.96 ´ 104 N? (Assume 3 significant digits.)
A.
B.
C.
D.
E.
2.  Your "weight" is properly defined as
A.
B.
C.
D.
E.
3.  The value of "g" at the surface of Mars is 3.7 N/kg. How much would a 60.0-kg person weigh at an altitude above the Martian surface equivalent to the planet's radius?
A.
B.
C.
D.
E.
4.  Which of the following graphs best represents the relationship between the gravitational force, F, that Earth exerts and the mass, m, of an object sitting at Earth's surface, that the force is exerted upon?
A.
B.
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D.
E.
5.  The gravitational field strength of Earth
A.
B.
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6.  If you weighed 112 N on the Moon where g = 1.6 N/kg, how much would you weigh on Earth?
A.
B.
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D.
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7.  According to Newton's law of universal gravitation, the gravitational force of attraction between two objects would be
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B.
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D.
E.
8.  What would the gravitational field strength be on a planet with half Earth's mass and half its radius?
A.
B.
C.
D.
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9.  Consider two planets, A and B. Planet A has half the mass and half the radius of planet B. The ratio of gA : gB would be
A.
B.
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D.
E.
10.  Study the force system diagram pictured below and select the factor which would NOT influence the amount of kinetic friction.
A.
B.
C.
D.
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11.  The coefficient of friction stems from the
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B.
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12.  If the strength of the frictional force is equal to the applied force and oppositely directed, and assuming that all other forces may be ignored, the object
A.
B.
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D.
E.
13.  A chalk brush sits on a metre stick as pictured in the diagram. As one end of the metre stick is elevated, the chalk brush eventually begins to slide. Why?
A.
B.
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D.
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14.  A 425-g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket?
A.
B.
C.
D.
E.
15.  A 4.0-kg object, A, and a 2.0-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2.0-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
A.
B.
C.
D.
E.
16.  A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40° above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart’s acceleration along the horizontal surface will be
A.
B.
C.
D.
E.
17.  A 1.8-kg object is pulled along the floor with a force of 7.0 N acting horizontally. If the object accelerates at 2.4 m/s2, how much kinetic friction is acting?
A.
B.
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D.
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18.  Which of the following statements concerning friction is true?
A.
B.
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D.
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19.  If all other forces can be ignored and the strength of the frictional force is greater than the applied force and oppositely directed, the object
A.
B.
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D.
E.
20.  The free-body diagram of a block being pushed up a rough ramp is best represented by
A.
B.
C.
D.
E.
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