PHY 131 Lecture Notes - Spring Scale, Nuclear Force, Resultant Force
Document Summary
Force is a vector quantity ; it has both magnitude and direction. S. i. unit of force is the newton ( n ) and is measured by using a spring balance. Contact forces are forces in which the force is in direct contact with the object. Examples of contact forces are (i) friction force (ii) tension force (iii) pull or a push ( research ) (2) field forces. Field forces are forces in which the force is not in direct contact with the object. Examples of field forces are (i) gravitational forces (ii) electric forces (iii) magnetic forces (iv) nuclear forces. A body is said to be in equilibrium if (1) the resultant force is zero in all directions (2) the total torque is zero about any axis. There are three types of equilibria. (a) stable equilibrium. A body is in stable equilibrium if it always returns to its original resting position whenever it is slightly tilted and released.
