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Laws of Motion

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Physics Part I

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
One end of a string of length is connected to a particle of mass and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed the net force on the particle (directed towards the centre) is:

(i) T, (ii) T - mv2 / l, (iii) T + mv2 / l, (iv) 0,

is the tension in the string. 

[Choose the correct alternative]. 

i) T is the correct answer. 

A particle connected to a string is revolving in a circular orbit around the center.

For rotation, the centripetal force is provided by the tension produced in the string. 

Therefore, the net force produced on the particle is the tension, T. 

That is, 

Error converting from MathML to accessible text.

F is the net force acting on the particle. 


Is Aristotle’s law of motion now correct?

No. Aristotl'e law of motion is false. 

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.

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. 

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. 

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.