Spring fitted doors close by themselves when released. You want to keep the door open for a long time, say for an hour. If you put a half kg stone in front of the open door, it does not help. The stone slides with the door and the door gets closed. However, if you sandwitch a 20 g piece of wood in the small gap between the door and the floor, the door stays open. Explain why a much lighter piece of wood is able to keep the door open while the heavy stone fails.
Answers
HEY MATE...!!!
The answer to your question is:
In the First case when a stone is kept, It
is unable to keep the door open, this is
because the Normal force between the
door and block just only equal to the
Weight of the Body, which can be easily
balanced by the Door.
But in case the Sandwich of 20 g is
placed in small gap, it will produce
large friction which will only be
balanced by the Normal Reaction of the
Door. Thus, the Door remains Open for
longer time, until and unless the
Sandwich is in it.
Also, the above reason can be
specified as the
"It is due to the greater force of
friction developed in the second case.
The force of friction developed
depends upon normal force developed
not on the weight of the object."
"In the first case the normal force
developed is only equal to weight of
the half kg stone. In the second case
the sandwiched piece of wood is
pressed down by the door which
results in much higher normal force. So
the force of friction is much higher too
and the small lighter piece of wood is
able to stop the door"
Hope it helps you ❤️ ✌️✌️
Mark brainliest ❤️
Answer:
In the First case when a stone is kept, It is unable to keep the door open, this is because the Normal force between the door and block just only equal to the Weight of the Body, which can be easily balanced by the Door.
But in case the Sandwich of 20 g is placed in small gap, it will produce large friction which will only be balanced by the Normal Reaction of the Door. Thus, the Door remains Open for longer time, until and unless the Sandwich is in it.
Also, the above reason can be specified as the,
''It is due to the greater force of friction developed in the second case. The force of friction developed depends upon normal force developed not on the weight of the object.''
''In the first case the normal force developed is only equal to weight of the half kg stone. In the second case the sandwiched piece of wood is pressed down by the door which results in much higher normal force. So the force of friction is much higher too and the small lighter piece of wood is able to stop the door.''
Hope it helps.