|Class 8 Physics Force and Pressure||Forces are due to an interaction|
As we can see in all of the above cases, 2 or more objects must interact for force to come into play. Eg 1: In the case of man pulling his luggage trolley, there is an interaction between the man and his trolley. The man is applying a 'push' on his trolley to make it move forward. Eg 2: In the case of the crane pulling the object, there is an interaction between the crane and the object. The crane is applying force of the object to pull it up.