PHYSICS [1 Mark Question Answer]

The force exerted by the atmosphere per unit area of the surface of earth is called atmospheric pressure. It decreases with increase in altitude.

The hand flour grinder is provided with a handle near its rim to increase the moment arm so that even a small force applied can produce a large turning effect.

The factors affecting the moment of force are magnitude of the force applied and the moment arm.

School bags have broad straps to reduce the pressure on our shoulders.

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.