When one body tries to move to another body, in response to the applied force, an opposing force called frictional force is produced and works in the opposite direction. Static friction is the type of friction that exists when two objects touch each other in the event of a break. It has a limiting value called Limiting Friction which is the minimum required to move the body from the position of rest. It is equal to a lower force. When the external force F increases, the level comes when the body is just on the verge of moving, at this stage, the force of friction is at its maximum, the limiting house. The amount of corrosion depends on the nature and condition of the polished surface of the two exposed surfaces. As long as the normal reaction remains the same, the amount of friction is independent of the area and size of the exposed surfaces. Friction 'F' Is directly proportional to the normal reaction 'R' between the two surfaces in contact.
1. Adhesion is the _______________ force resulting when two materials are brought into close contact with each other.
A. Molecular force
B. Chemical force
C. Magnetic force
D. None of these
2. Which is the causes of Friction?
A. Resistive force are molecular adhesion
B. Surface roughness
C. Deformations
D. All of above
3. Which of the following are the types of Friction?
A. Static friction
B. Sliding friction
C. Rolling friction
D. All of above
4. Friction changes the energy of an object from kinetic energy to ________ energy.
A. Stored
B. Solar
C. Heat
D. All of above
5. In which way, friction can be reduced?
A. Using a wheel
B. Using oil
C. Using grease
D. All of above
6. The measurement of the amount of friction a surface will generate is called the '__________ of friction'.
A. Calibration
B. Coefficient
C. Smoothness
D. No anyone of above
7. A bowling ball on a bowling lane is an example of what type of friction?
A. Static Friction
B. Dry friction
C. Rolling friction
D. Fluid friction
8. A child sliding down the slide at a park is an example of which type of Friction?
A. Static Friction
B. Dry friction
C. Rolling friction
D. None of these
9. A block sitting still on the side of a ramp is an example of what type of friction?
A. Static Friction
B. Rolling friction
C. Fluid friction
D. Dry friction
10. When was friction force invented?
A. In 1483
B. In 1493
C. In 1473
D. In 1403
11. Air resistance on a flying airplane is an example of what type of friction?
A. Rolling friction
B. Fluid friction
C. Dry friction
D. Static Friction
12. Who invented Friction force?
A. Newton's
B. Albert Einstein
C. Leonardo da Vinci
D. None of these
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