All Questions
10
questions
6
votes
3
answers
516
views
Interesting answer as a range of tension in pulley-block-plane system
I want some intuitive understanding on why there will be a range in tension in the below question. (On solving we will get that the system is at rest ($a=0$) and since its starts from rest the blocks ...
- 95
0
votes
1
answer
923
views
Why doesn't a fly in the moving train hit the wall? [duplicate]
Just a simple question but trickier than I expected.
Let us suppose that there is a fly hovering in the moving train. The train moves at a speed much higher than the hovering of the fly. However, the ...
- 1,669
0
votes
1
answer
170
views
Total work done by friction on a system, when friction is static and internal to system? [duplicate]
Will the total work done by friction on a system be always zero if friction is static and internal to the system? Explain if possible by man boat problem as system and no friction is being provided by ...
- 35
1
vote
1
answer
277
views
Why do tires move forward?
I have heard a lot of people saying that when the tires of a car rotates backward, a friction acts in forward direction on the tire and the car moves forward.
Now according to my physics book,
" ...
user223406
1
vote
2
answers
655
views
On methods to know the type of friction [duplicate]
Suppose three blocks are stacked, one on the another and a constant force is applied on the bottom one, how could I know if the friction that is acting on those objects is kinetic or static? Moreover, ...
- 65
2
votes
3
answers
333
views
Friction and Work in Inertial Reference Frames [duplicate]
Say a train is moving in the positive $x$-direction at 100 meters per second with respect to the ground frame. Now let's say someone is pushing a large box in one of the cars of that train in the ...
- 207
1
vote
1
answer
982
views
How does friction cause a boat to move backward if a person on it moves forward?
If a person on boat moves forward (from left to right of a boat)and if we draw the free body diagram we would observe that
1)mg is balanced by normal reaction
2)friction acts to the left side, on the ...
- 47
1
vote
2
answers
2k
views
Directions of static & kinetic friction?
Static friction :
Static friction opposes relative motion between two surfaces. The car is moving at some tangential velocity relative to the road. Thus, static friction should act in the opposite ...
- 27
1
vote
0
answers
53
views
Rolling (without slipping) ball on a moving surface 2 [duplicate]
Possible Duplicate:
Rolling (without slipping) ball on a moving surface
Apparently I didn't log in properly when I asked a question this morning: Rolling (without slipping) ball on a moving ...
- 31
2
votes
1
answer
2k
views
Rolling (without slipping) ball on a moving surface
I've been looking at examples of a ball rolling without slipping down an inclined surface. What happens if the incline angle changes as the ball is rolling?
More precisely I've been trying to find ...
- 31