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The force exerted by an object perpendicular to the surface is called:
pressure
thrust
weight
buoyancy
thrust
The force exerted by an object perpendicular (at a 90┬░ angle) to a surface is called thrust. While pressure is the thrust acting per unit area, thrust itself refers to the total perpendicular force.
The force exerted by an object perpendicular (at a 90┬░ angle) to a surface is called thrust. While pressure is the thrust acting per unit area, thrust itself refers to the total perpendicular force.
When you push your hand flat against a wall, the total force you apply pushing directly into the wall is the thrust; if you apply that same force through a sharp needle instead, the smaller surface area creates a much higher pressure.
FthrustтАЛ=P├ЧA тАФ where P is pressure and A is the contact area
P=AFтАЛ тАФ formula for pressure, where F is thrust
According to Newton's third law of motion, when one body exerts a force on another, the second body exerts an equal and opposite force on the first. The component of this contact force that acts normal (perpendicular) to the surface of contact is defined as thrust. It is measured in Newtons (N) in the SI system.
Thrust is a vector quantity (magnitude and direction).
The SI unit of thrust is the Newton (N).
Thrust is always perpendicular to the surface it acts upon.
Pressure depends on the area over which the thrust is distributed.
Design of foundation blocks to distribute heavy loads.
Designing cutting tools (sharp edges decrease area to increase pressure).
| Feature | Pressure | Thrust |
|---|---|---|
Definition | Force per unit area | Total perpendicular force |
Option A (pressure) is the effect of thrust over an area.
Option C (weight) is a specific type of downward force due to gravity, not necessarily perpendicular to any arbitrary surface.
Option D (buoyancy) is an upward force exerted by a fluid on an immersed object.
B is correct тАФ The force exerted by an object perpendicular to a surface is called thrust.
Always remember that thrust is a force (vector), while pressure is a scalar quantity derived from that force.
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