PHYSICS [2 Mark Question Answer]

Pillars of a bridge have a broader base than the top. This is done to reduce the pressure exerted on the ground by the enormous weight of the bridge. As pressure is inversely proportional to the area of contact, so if the base is broader, the area of the contact increases, reducing the pressure on the ground due to the weight of
the bridge.

If the force has a tendency to turn or rotate a body in clockwise direction, the moment of force is called clockwise moment. If the force has a tendency to turn or rotate a body in anticlockwise direction, the moment of force is called an anticlockwise moment.

Safety pins and drawing pins have narrow and sharp tips because the smaller surface area of the tip causes a high pressure and, therefore, makes it easier for these objects to pierce through a given material.

It is easier to open a door by applying the force at its handle than at the hinged end because the moment of force is large when the force is applied at the handle as the moment arm is larger as compared to when the force is applied at the hinged end.

When the nozzle of a syringe Is dipped in a liquid and its piston is withdrawn, a region of low pressure is created in the syringe. The atmospheric pressure acting on the surface of the liquid is greater and hence forces the liquid
to rise in the syringe.

Birds that walk on leaves floating on the surface of the water have wide feet. This is because wide feet increases the area of contact with the leaves. So, they exert less pressure on the leaves, allowing them to walk on these leaves.