Points to Remember
•
Force acting on a body tends to change its state of rest or of motion or its
shape. The SI unit of force is newton.
•
Force acts only when two or more objects interact with one other.
•
The effect of force can be measured using the physical quantity called
pressure.
•
Liquids, gases and air also exert pressure.
•
All objects on the surface of the Earth experience a constant thrust or force
due to the atmosphere.
•
Atmospheric pressure can be measured by a device called barometer.
•
Friction is the force that opposes the motion of an object.
•
Friction is caused by irregularities on the surfaces, which are in contact.
•
Friction depends on the nature of the surfaces and mass of the bodies in
contact.
•
Friction is classified into two types: static friction and kinetic friction.
Kinetic friction can be further classified as rolling friction and sliding
friction.
•
Surface tension is the tendency of liquid surfaces to shrink to have minimum
surface area as mush as possible.
•
When liquids are flowing there is a frictional force between the layers of the
liquid, which oppose their relative motion. This force is called viscous force
and the phenomenon is known as viscosity.
•
Viscosity is measured by the unit called poise in CGS system and kgm–1s–1
and Nsm–2 in SI.
GLOSSARY
Buoyant force An
upward force exerted by liquid on a floating body.
Force - Ation of
push or pull.
Friction - Force
produced due to the geometrical dissimilarities of the surface of the bodies
which are in relative motion.
Pressure - Force
acting on unit area.
Surface tension Force
which contracts the surface area of the liquids.
Thrust - Force
acting perpendicularly on any given surface area.
REFERENCE BOOKS
1.
Fundamentals of Physics (English, Hardcover) David Halliday & Jearl Walker.
2.
Principles of Physics, International Student Version (English, Paperback) Jearl
Walker, David Halliday, Robert Resnick.
3.
Concepts of Physics (Volume-1) 1st Edition (English, Paperback) H. C. Verma.
4.
Fundamentals of Physics (English, Hardcover) David Halliday
INTERNET RESOURCES
1. h t t p s : / / w w w . y o u t u b e . c o m /
watch?v=Oe6bDTL3YQg
2.
h t t p s : / / w w w . y o u t u b e . c o m / watch?v=KndNN28OcEI
3.
https://www.youtube.com/watch?v=-B5IBoZ08-I
4.https://www.stufftoblowyourmind.com/videos/51302-stuff-to-blow-your-kids mind-atmospheric-pressure-video.htm
Concept Map
ICT CORNER
Force and Pressure
This
activity helps to learn about the Fluid pressure & Pascal’s Law
Steps
*
Open the Browser and type the URL link given below (or) Scan the QR Code.
*
Select the “Fluid Pressure and Pascal’s Law” .You can view this page.
*
You can view this page .Touch the play button.
*
To get more idea about the Pascal’s Law for fluid pressure through Experiment.
Web link:
https://www.youtube.com/watch?v=dx2P7i1GPaw (or) scan the QR Code
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