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Pascal’s Principle Conceptual Physics Text Correlation: Section 19.6 35

Pascal’s Principle Conceptual Physics Text Correlation: Section 19.6 35

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Pascal’s Principle

Conceptual Physics

Text Correlation: Section 19.6

35

Question 1

• Suppose you exerted your input force on the larger piston in Figure 19.19. How much force would you have to exert to lift a 2-unit block?

• Answer: Fifty times as much, 100 units.

Question 2

• If one unit of force lifts 50 units, isn't energy conservation being violated?

• Answer: No. The I unit of force moves the 50 units only 1/50th the distance the 1-unit moves.

Question 3

• Suppose the liquid were removed from the reservoir altogether. Would the lift still work under air pressure?

• Answer: Yes, just as air pressure in tires helps to support the weight of the car. Hydraulic liquid maintains a constant volume, so the air compressor need compress less air to lift the car.