(i) List two differences between thrust and pressure.

(ii) What is meant by 1 pascal and 1 newton? How will the pressure change, if area of contact is doubled?

Difference between thrust and pressure are

Thrust:

1.The force exerted by the body perpendicular to the surface is known as thrust.

2.SI unit of thrust is newton (N)

Pressure:

1.Thrust acting on unit area is called pressure, i.e.

Pressure ยง = Force / Area (A)

2.SI unit of pressure is ${{Nm}^{2}}$ or Pa (pascal).

(ii) The pressure exerted by 1 N of force, acting perpendicular on the surface of 1 m2 area is called 1 pascal.

1Pa = 1${{Nm}^{-2}}$

The force required to accelerate 1 kilogram of mass at the rate of 1 metre per second square is called 1 newton.

IN = 1${{Kgm}^{-2}}$

Since, pressure is inversely proportional to the area of contact.

Therefore, pressure will reduce to half, if area of contact is doubled.