Physics Part I

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Class 10 Class 12

A man of 50 kg mass standing in a gravity free space at height of 10 m above the floor. He throws a stone of 0.5 kg mass downwards with a speed 2 ms-1. When the stone reaches the floor, the distance of the man above the floor will be

• 9.9 m

• 10.1

• 10 m

• 20 m

B.

10.1

m r = constant

The distance of the man above the floor (total height) = 10+0.1 = 10.1

m r = constant

The distance of the man above the floor (total height) = 10+0.1 = 10.1

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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.
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Is Aristotle’s law of motion now correct?

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