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8 Cards in this Set
- Front
- Back
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The coefficient of friction is defined as the: A) Force parallel to the surface required to keep an object moving at a constant linear velocity B) Reaction normal perpendicular to the surface C) Ratio of the force required to move a body to the normal reaction force D) Force parallel to the surface required to start an object moving E) Downward force on the two surfaces in contact
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C) Ratio of the force required to move a body to the normal reaction force |
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With static or kinetic friction, the force of friction is proportional to the _____ that presses the two surfaces together. A) Kilogram B) Energy C) Pressure D) Force E) Mass
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D) Force |
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The force of friction is: A) Not affected by the roughness of the two surfaces in contact B) Dependent on the area of the two surfaces in contact C) Not affected by the area of the two surfaces in contact D) Equal in magnitude for all types of friction E) Applied in the vertical direction
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C) Not affected by the area of the two surfaces in contact |
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Find the force required to move a block of mass 25 kg on a horizontal floor if the coefficient of sliding friction is 0.19. A) 4.66 kN B) 4.28 N C) 46.6 N D) 1.31 N E) 4.28 kN |
C) 46.6 N |
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Friction may occur in which of the following forms? 1. Standing 2. Sliding 3. Rolling 4. Fluid 5. Moving 6. Shaking A) 1, 2, 5, 6 B) 3, 4, 5, 6 C) 1, 2, 3, 4 D) 2, 3, 4, 5 E) 1, 2, 4, 5 |
C) 1, 2, 3, 4 |
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Which of the following statements is false? A) Kinetic friction is greater than rolling friction B) Kinetic friction is not affected by the body's speed C) Friction is affected by the relative roughness of the two surfaces D) The force of friction is not affected by the area of the surfaces in contact E) Kinetic friction is greater than static friction |
E) Kinetic friction is greater than static friction |
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The force of friction is: A) Not affected by the roughness of the two surfaces in contact B) Equal in magnitude for all types of friction C) Not affected by the area of the two surfaces in contact D) Applied in the vertical direction E) Dependent on the area of the two surfaces in contact |
C) Not affected by the area of the two surfaces in contact |
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In the case of static friction, if the downward force between the surfaces is doubled, then the friction will: A) Remain constant B) Decrease by half C) The square root of the downward force D) Increase by twice as much E) Be eliminated |
D) Increase by twice as much |
