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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

Sand is being dropped on a conveyor belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of v m/s will be

  • Mv newton

  • 2 Mv newton

  • Mv/2 Newton

  • zero


A.

Mv newton

Force required,

straight F space equals space fraction numerator straight d left parenthesis mv right parenthesis over denominator dt end fraction
equals space straight v open parentheses dm over dt close parentheses space equals space vM


as velocity v is constant, hence

F= Mv newton

Force required,

straight F space equals space fraction numerator straight d left parenthesis mv right parenthesis over denominator dt end fraction
equals space straight v open parentheses dm over dt close parentheses space equals space vM


as velocity v is constant, hence

F= Mv newton

708 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

Is Aristotle’s law of motion now correct?

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