Block on Rough Table - Friction Question - Maharashtra Board Class 11 Physics textbook solutions

 Clickhere for the solution of Block on Rough Table - Friction Question - Maharashtra Board Class 11 Physics textbook

Figure below shows a block of mass 35 kg resting on a table. The table is so rough that it offers a self adjusting resistive force 10% of the weight of the block for its sliding motion along the table. A 20 kg wt load is attached to the block and is passed over a pulley to hang freely on the left side. On the right side there is a 2 kg wt pan attached to the block and hung freely. Weights of 1 kg wt each, can be added to the pan. Minimum how many and maximum how many such weights can be added into the pan so that the block does not slide along the table?

Vehicle turning on unbanked curve | Maximum velocity around an unbanked curve | Derivation of v(max)= sqrt(μrg)

 In this video we discuss - Vehicle turning on a horizontal circular track. We understand how friction of the road contributes to the centripetal force.

We also derive the equation - v(max)= sqrt(μrg).

Basically we answer the below questions:

 *When a vehicle is taking a turn on horizontal road - the necessary centripetal force is provided by whom? 

*At what maximum speed can a car safely negotiate a horizontal unbanked turn?

 *What force causes centripetal acceleration of a car making a turn on a flat road? 

*What type of force is responsible for keeping a car from skidding while moving around an unbanked curve? 

Click here for pdf

 

 

Wall of death I Well of death | Spinning Room Amusement Park Ride - Analysis/Notes

 

In this video we try to understand (a) motion of a car moving well of death or a man stuck to the wall of a rotating drum (that has no base) (b) horizontal and vertical forces acting on this man. (c) the concept of Normal force. Hope you find this useful. You may like to increase speed to 1.25X or 1.5X. Thanks for watching / pl share.

You can click on these to see live demos:

https://www.youtube.com/watch?v=YdvxHETmbBc
https://www.youtube.com/watch?v=i4y7TbSHT2g

 

Click here for notes: Friction notes

 

 

Friction problems solved - Block lying on horizontal / inclined friction plane.

Attached herewith is a worksheet for Friction problems - with answers. Worksheet

 

In this video we discuss Static/Kinetic frictions and Angle of Repose. Then we solve friction problems based on block lying on horizontal and inclined planes. We also solve a friction+pulley+inclined plane problem