PHYSICS [1 Mark Question Answer]

A=?
⇒F= 50 N
⇒P= 2000 Pa
⇒Area= Force/Pressure
⇒A= 50/2000
⇒A= 0.025 m²
⇒Therefore, the area of cross-section of a body is = 0.025 m²

P=7000pa
⇒A=0.25 m²
⇒P= F/A
⇒7000=F/0.25
⇒F=7000*0.25
⇒So, F= 1750 N
⇒ Therefore, the magnitude of a force is 1750 N

We know that Pressure is inversely proportional to area. So, smaller area will exert more pressure, thus a sharp nail has small area that comes in contact with the object, so more pressure can be applied on the object.

A drawing pin is kept broad from thumb side, but very sharp from the pin side. The broad thumb reduces the pressure on the thumb, but the sharp pin tip increases the pressure on the wooden board and easily penetrates in it.

A sharp knife cut objects better because due to its very thin edge, the force of our hand falls over a very small area of the object producing a large pressure and this large pressure cuts the object easily.

The weight of a tank is very high compared to a normal vehicle. If wheels were used the pressure on the ground would be so high that the wheels will go into the ground. So, to decrease the pressure on the ground the broad metallic strips are used instead of wheels.
Since, pressure = force/area, so, increase in area decreases pressure.

The foundation of the buildings is made wider than the walls in order to decrease the pressure of the building at its base and prevent the building from sinking. The wider foundation has more surface area which helps to decrease the pressure.

Skiers use flat and long skies to slide on snow,because the larger the area of cross-section,the lesser is the pressure on snow.

Camels can walk easily in the desert but not a horse because of their wide feet. Their wide feet allow the weight of their body to act on a larger surface of land reducing the pressure exerted on the land by the camel. As we know, pressure exerted and area are inversely proportional.

Trucks carry most of the load at the rear side. Also most vehicles are rear wheel drive and thus force is applied on the ground through the rear wheel. Double wheels are provided at the rear to cope with these forces

The force acting on a unit area of a surface is called pressure. It acts perpendicular to the surface on which pressure is exerted. Pressure= force/area on which it acts. Lesser the area, greater is the force.
The SI unit of pressure is pascal.

The turning effect of force is known as moment of force. It is the product of the force multiplied by the perpendicular distance from the line of action of the force to the pivot or point where the object will turn.
SI unit is Newton-meter (Nm).

The moment of a force F (applied at a point P) about a point A is equal to ±Fd where: F is the magnitude of the force. d is the perpendicular distance from A to the line of action of the force.