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Laws of Motion

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A student measures the distance traversed in free fall of a body, initially at rest in a given time. He uses this data to estimate g, the acceleration due to gravity. If the maximum percentage errors in measurement of the distance  and the time are e1 and e2 respectively, the percentage error in the estimation of g is

  • e1 - e2

  • e1 + 2e2

  • e1+ e2

  • e1 - 2e2


B.

e1 + 2e2

straight h space equals 1 half gt squared

straight g space equals space straight h over straight t squared
therefore space log space equals space log space straight h space minus 2 space log space straight t
open parentheses fraction numerator increment straight g over denominator straight g end fraction straight x 100 close parentheses subscript max space equals space open parentheses fraction numerator increment straight h over denominator straight h end fraction straight x 100 close parentheses plus 2 open parentheses fraction numerator increment straight t over denominator straight t end fraction straight x 100 close parentheses
straight e subscript 1 plus 2 straight e subscript 2
straight h space equals 1 half gt squared

straight g space equals space straight h over straight t squared
therefore space log space equals space log space straight h space minus 2 space log space straight t
open parentheses fraction numerator increment straight g over denominator straight g end fraction straight x 100 close parentheses subscript max space equals space open parentheses fraction numerator increment straight h over denominator straight h end fraction straight x 100 close parentheses plus 2 open parentheses fraction numerator increment straight t over denominator straight t end fraction straight x 100 close parentheses
straight e subscript 1 plus 2 straight e subscript 2
446 Views

When the branches of an apple tree are shaken, the apples fall down. Why?

The apple fall from an apple tree when it shaken because of inertia of rest. Apple is in a state of rest and when the tree is suddenly shaken, apples still tends to remain in it's same state of rest whereas branches move. 

So, the apples fall down. 
1475 Views

Is Aristotle’s law of motion now correct?

No. Aristotl'e law of motion is false. 
1233 Views

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.
2445 Views

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. 
1316 Views

State Galileo’s law of motion.

Galileo’s law of motion states that, a body continues to move in the same direction with constant speed, if no force is acting on the body. 
1332 Views