FORCE AND PRESSURE class 8
FORCE Q.1. Define the term force. What are its characteristics? Ans. In science, a push or a pull on an object is called a force. The fo rce always has a measure of its strength or magnitude and direction in which it is applied. So, Force is a vector quantity. The S.I. unit of Force is N (Newton). Q.2. Forces are due to an Interaction. Justify. Ans. At least two objects must interact for a force to come into play. This means whenever a force is applied on an object, three things can be easily observed: Ø agent exerting the force Ø the object on which it acts Ø the effect of the force Q.3. What do we mean by Net force? What are the rules for calculating net force? Ans. The sum of all the forces acting on an object is called ‘Net force’. F NET = F 1 +F 2 + ....... +F N Rules for calculating net force : } If two forces applied on an object in the same direction