The forces which act on bodies when they are in physical contact. are called contact forces. For
e.g. frictional force and force exerted on two bodies during a collision.
2)
➡️ General Properties of Magnetic Lines of Force :-
➙They seek the path of least resistance between opposite magnetic poles.
➙They never cross one another.
➙They all have the same strength.
➙Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.
➡️ Main Characteristics of Gravitational Forces:-
The gravitational force is basically a central force, which works along the line joining the centers of two bodies. It is always a long range force. It is crucial to know that the gravitational force is always attractive, unlike electrostatic and magnetic forces.
3).
Weight is zero in the absence of gravity.
4)
ᴀᴛᴍᴏsᴘʜᴇʀɪᴄ ᴘʀᴇssᴜʀᴇ:-
The atmospheric pressure varies with altitude as density of air decreases as we rise up and air becomes rarer. For example: Pressure at sea level is taken as 76 cm of Mercury Column, which is one atmosphere. For every 105m rise in height, pressure decreases by 1 cm of mercury column.
5)
Two effects of a force applied on a body are:-
(i) It can change the state of movement of the body on which force is applied, i it can move a stationary object or stop a moving object.
(ii) It can change the shape and size of an object
6)
The ends of the nails and pins are made sharp in order to minimize the area which in turn increases the pressure.
Answers & Comments
1)
cσηтαcт ƒσяcє:
The forces which act on bodies when they are in physical contact. are called contact forces. For
e.g. frictional force and force exerted on two bodies during a collision.
2)
➡️ General Properties of Magnetic Lines of Force :-
➙They seek the path of least resistance between opposite magnetic poles.
➙They never cross one another.
➙They all have the same strength.
➙Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability.
➡️ Main Characteristics of Gravitational Forces:-
The gravitational force is basically a central force, which works along the line joining the centers of two bodies. It is always a long range force. It is crucial to know that the gravitational force is always attractive, unlike electrostatic and magnetic forces.
3).
Weight is zero in the absence of gravity.
4)
ᴀᴛᴍᴏsᴘʜᴇʀɪᴄ ᴘʀᴇssᴜʀᴇ:-
The atmospheric pressure varies with altitude as density of air decreases as we rise up and air becomes rarer. For example: Pressure at sea level is taken as 76 cm of Mercury Column, which is one atmosphere. For every 105m rise in height, pressure decreases by 1 cm of mercury column.
5)
Two effects of a force applied on a body are:-
(i) It can change the state of movement of the body on which force is applied, i it can move a stationary object or stop a moving object.
(ii) It can change the shape and size of an object
6)
The ends of the nails and pins are made sharp in order to minimize the area which in turn increases the pressure.
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