CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 4. Motion and Forces

Vocabulary

• Pascal’s law: SI unit for pressure, equal to 1 Newton per square meter (N/m^2 ).

Explore More

At the following URL, read how a hydraulic car lift works and do the animation. Then answer the questions below.

http://webphysics.davidson.edu/physlet_resources/bu_semester1/c23_pressure_pascal.html

1. How does force change in a hydraulic lift?


2. In the animation of the lift, what happens when you add mass to the small cylinder?


3. Explain how a hydraulic lift can raise an object as heavy as a car.

Review

1. What is Pascal’s law?


2. Apply Pascal’s law to the ketchup packet shown in theFigure4.64. Explain what will happen if you tear a
   small hole in one corner of a packet and then squeeze the packet.

FIGURE 4.64