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Laws of Motion

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Physics Part I

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Physics

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Class 10 Class 12
A block rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is (take g = 10 m/s2 )
  • 2.0

  • 4.0

  • 1.6 

  • 2.4


A.

2.0

Let the mass of block be m.
Frictional force in rest position
F = mg sin 30



10 space equals space straight m space straight x space 10 space straight x space 1 half
space straight m space equals space fraction numerator 2 space straight x space 10 over denominator 10 end fraction space equals space 2 space kg

Let the mass of block be m.
Frictional force in rest position
F = mg sin 30



10 space equals space straight m space straight x space 10 space straight x space 1 half
space straight m space equals space fraction numerator 2 space straight x space 10 over denominator 10 end fraction space equals space 2 space kg

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What is Aristotle’s law of motion?

Aristotle’s law of motion states that an external force is required to keep the body in motion.
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State Galileo’s law of motion.

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Define inertia.

The property by virtue of which the body cannot change its state of rest or uniform motion in a straight line, unless an external force is acting on the body is called as Inertia. 
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Is Aristotle’s law of motion now correct?

No. Aristotl'e law of motion is false. 
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