Chapter Chosen

Laws of Motion

Book Chosen

Physics Part I

Subject Chosen

Physics

Book Store

Download books and chapters from book store.
Currently only available for.
CBSE Gujarat Board Haryana Board

Previous Year Papers

Download the PDF Question Papers Free for off line practice and view the Solutions online.
Currently only available for.
Class 10 Class 12

The upper half of an inclined plane of the inclination straight theta is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by,

  • straight mu space equals space fraction numerator 1 over denominator tan space straight theta end fraction
  • straight mu space equals space fraction numerator 2 over denominator tan space straight theta end fraction
  • straight mu space equals space 2 space tan space straight theta
  • straight mu space equals space tan space straight theta

C.

straight mu space equals space 2 space tan space straight theta


The block will be stationary when,

mg sin straight theta . L = straight alpha mg cos straight theta space. space straight L over 2
straight mu space equals space fraction numerator mg space sin space straight theta space straight L over denominator mg space cos space straight theta space begin display style bevelled straight L over 2 end style space end fraction

space space equals space 2 space fraction numerator sin space straight theta over denominator cos space straight theta end fraction

space space equals space 2 space tan space straight theta

straight mu equals space 2 space tan space straight theta


The block will be stationary when,

mg sin straight theta . L = straight alpha mg cos straight theta space. space straight L over 2
straight mu space equals space fraction numerator mg space sin space straight theta space straight L over denominator mg space cos space straight theta space begin display style bevelled straight L over 2 end style space end fraction

space space equals space 2 space fraction numerator sin space straight theta over denominator cos space straight theta end fraction

space space equals space 2 space tan space straight theta

straight mu equals space 2 space tan space straight theta
1969 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

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

Is Aristotle’s law of motion now correct?

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

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