F5 CHAPTER 8 FORCE & PRESSURE (Pascal's principle)

Which of the following explains the principle in a hydraulic system?

• Fluid has a fixed shape

• Fluid has free moving particles

• Fluid can be compressed in a enclosed system

• Fluid transfers pressure in all directions uniformly in an enclosed system

The following information shows a few examples of devices used in daily life

* Dental chair

* Hydraulic brake

* Hydraulic jack

What is the principle applied by the devices above?

• Pascal's principle

• Bernoulli's principle

• Archimedes principle

• The principle of conservation of momentum

Which vehicle or machine applies Pascal's principle?

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Diagram shows a hydraulic jack. What is the characteristics of the oil that allows the above instruments to lift the car while we change the car tyres?

• Oil cannot be compressed

• Oil has a fixed shape

• Oil has particles that are closely arranged and compact

• Oil has particles that are arranged far apart from each other

What happens in the hydraulic brake system when the car driver presses the brake pedal.

• The piston in the main cylinder is pushed inside

• The big piston is pushed outside

• Pressure will pull the brake shoe

• The spring will pull the brake shoe

Diagram shows a hydraulic pump. Which of the following statement is true?

• The force F is the same as the weight of the load

• The force is greater than the weight of the load

• The pressure on piston P is the same as the pressure on piston Q

• The pressure on piston P is smaller than the pressure on piston Q.