Presentation on theme: "Ch. 3 & 4 Motion & Forces VII. Forces in Fluids (Ch. 8.5) Archimedes Principle Pascals Principle Bernoullis Principle."— Presentation transcript:
Ch. 3 & 4 Motion & Forces VII. Forces in Fluids (Ch. 8.5) Archimedes Principle Pascals Principle Bernoullis Principle
A. Archimedes Principle Fluid matter that flows liquids and gases Buoyancy the ability of a fluid to exert an upward force on an object immersed in it
A. Archimedes Principle Bouyant Force upward force exerted by a fluid on an immersed object bouyant force > weight bouyant force = weight bouyant force < weight balloon rises balloon sinks balloon floats
More water needs to be displaced in order to cancel weight ball floats lower in the water. Not enough water is displaced in order to cancel weight ball sinks. A. Archimedes Principle Archimedes Principle the bouyant force on an object in a fluid is equal to the weight of fluid displaced by the object Very little water needs to be displaced in order to cancel weight ball floats on surface. View animationsView animations produced by students at Poly Prep Country Day School in Brooklyn, New York. View Buoyancy JAVA Applet.
B. Pascals Principle Pascals Principle pressure applied to a fluid is transmitted unchanged throughout the fluid View hydraulics explanation.
B. Pascals Principle A car weighing 1000 N sits on a 250 m 2 platform. What force is needed on the 10 m 2 plunger to keep the car from sinking? GIVEN: Platform: F = 1000 N A = 250 m 2 Plunger: F = ? A = 10 m 2 (1000 N)(10 m 2 )=(250 m 2 )F 2 F 2 = 40 N WORK : 1000 N = F 2 250 m 2 10 m 2
C. Bernoullis Principle Bernoullis Principle as the velocity of a fluid increases, the pressure exerted by the fluid decreases EX:airplane lift, curve balls