Test: Force & Pressure- 1

A push or pull on an object is called force. Force can make stationary body in motion and moving body in rest.

Contact forces are those that result when the two interacting objects are perceived to be physically contacting each other.
Example: Frictional forces, tensional forces, normal forces, air resistance forces, and applied forces.

S.I. unit of force is Newton.
One Newton is a force required to push a body of mass of one kg to a distance of one meter.

In a game of tug-of war, two teams pull the rope in opposite direction. The team that pulls the rope toward itself will become winner.

The total force acting perpendicular on a given surface is called thrust. Thrust acting upon a unit area is called pressure.

In the given water tank, B and C are at the same levels. Hence, from taps B and C, water will flow out at the same pressure.

The force on an object is zero if the two forces acting on it in opposite directions are equal in magnitude. This kind of force is called balanced force.

F = 16 N,
A = 50 cm² = 50 / 10000 m²
We know that, P = F / A
∴ P = (16 x 10000) / 50 = 3200 Pa

A force applied on an object may change its speed. 

If the force applied on the object is in the direction of its motion, the speed of the object increases.
If the force applied on the object is in the direction opposite to the direction of motion, the speed of the object decreases.

Force, F = 1200 N
Area, A = 10 cm² = 10×10^-4 m² = 10^-3 m²

Thrust (perpendicular force), F = 1200 N

Pressure, P =  F/A = 1200/10⁻³ = 1.2×10⁶ N/m²