Pascal's Principle

Question 1

Pascal's principle states that pressure applied to an enclosed fluid is transmitted:

Accepted Answer

Equally in all directions — Pressure in an enclosed fluid is transmitted equally throughout.

Question 2

A device that uses Pascal's principle to multiply force is a:

Accepted Answer

Hydraulic jack — A hydraulic jack multiplies force using Pascal's principle.

Question 3

In a hydraulic system, the relationship between forces and areas is:

Accepted Answer

F₁/A₁ = F₂/A₂ — Equal pressure means F₁/A₁ = F₂/A₂.

Question 4

A small piston (area 0.002 m²) has 10 N applied. The large piston has area 0.02 m². The output force is:

Accepted Answer

100 N — F₂ = 10 × (0.02 / 0.002) = 10 × 10 = 100 N.

Question 5

For a hydraulic system to work well, the fluid must be:

Accepted Answer

Nearly incompressible — An incompressible fluid transmits pressure without being squashed.

Question 6

A force of 25 N is applied to a piston of area 0.005 m². The pressure transmitted is:

Accepted Answer

5000 Pa — P = F / A = 25 / 0.005 = 5000 Pa.

Question 7

To get a larger output force in a hydraulic system, the output piston should have a:

Accepted Answer

Larger area — A larger output area gives a larger output force for the same pressure.

Question 8

A hydraulic press has input area 0.01 m² and output area 0.10 m². An input force of 200 N produces an output of:

Accepted Answer

2000 N — F₂ = 200 × (0.10 / 0.01) = 200 × 10 = 2000 N.

Question 9

Hydraulic brakes in a car are an application of:

Accepted Answer

Pascal's principle — Hydraulic brakes transmit pressure equally through brake fluid (Pascal's principle).

Question 10

If the input and output pistons have equal area, the output force compared to the input force is:

Accepted Answer

Equal — Equal areas mean no force multiplication, so output equals input.