Ch – 11 Force & Pressure

Important Points:

  • A push or pull on an object is known as force.
  • At least two objects must interact for a force to come into play.
  • Forces applied on an object in the same direction add to one another.
  • If two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.
  • The strength of the force is expressed by its magnitude.
  • Force effects the speed of an object.
  • If the force applied on the object is in the direction of its motion, the speed of the object increases.
  • If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object.
  • A change in either the speed of an object, or its direction of motion, or both, is described as a change in its state of motion.
  • The state of motion of an object is described by its speed and the direction of motion.
  • The state of rest is considered to be the state of zero speed.
  • Force on an object may change its shape.
  • Muscular force enables us to perform all activities involving movement or bending of our body.
  • If a force acts on an object with being in contact with it is known as contact force.
  • If a force acts on an object without being in contact with it is known as non-contact force.
  • The force of friction or frictional force always acts on all the moving objects and its direction is always opposite to the direction of motion.
  • The force exerted by a magnet is known as magnetic force.
  • Objects or things fall towards the earth because of the force of gravity or gravitational force.
  • The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
  • The force acting on a unit area of a surface is called pressure.
  • Pressure = force/area on which it acts
  • The pressure exerted by atmosphere is known as atmospheric pressure.

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

5 thoughts on “Ch – 11 Force & Pressure

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: