Many educators consider 9th grade as an important phase of school education. This is when
class 9 science
and mathematics get really difficult. Having a vast syllabus and difficult to understand topics, students begin to lose concentration. Students need to be introduced to new learning habits at this stage that will keep them engaged and glued to their reading material.
Matter in Our Surrounding
- Fusion is the change from solid to liquid for example solid wax.
- Solidification is the change of state from liquid to solid.
- Vaporization is the change of state from liquid to gas and
- Condensation is the change of state from gas to liquid
- Sublimation is the change of state from gas to solid or vice-versa without going into the liquid state, for example, the burning of camphor.
Is matter around us pure?
Atoms and Molecules
The Fundamental Unit of Life
- Golgi apparatus
- Rough endoplasmic reticulum
- Smooth endoplasmic reticulum
- Plasma membrane
- Paroxysm and
- Linear Motion: The linear or Translatory motion is that motion in which body moves in straight lines or any curved path. Example a man running on the straight road.
- Rotatory Motion: Rotatory motion, also referred to as rotational motion or circular motion, is the physical motion that happens when an object rotates or spins on an axis. For example, the rotatory motion of planets on its axis.
- Oscillatory Motion: Any particle that undergoes to and fro motion in the small interval of time and vibration is said to be in vibratory motion. For example, a tuning fork set to vibrate is a classic example of this.
Law of motion
- The first law of motion is also called the law of inertia: It states that objects will remain at rest or in uniform motion in a straight line unless acted upon by an external unbalanced force
- Newton’s second law states acceleration of an object depends on the mass of the object and the amount of force applied in mathematical terms Newton’s second law states that force is the product of mass and acceleration To cause an object to accelerate or speed up, a force must be applied, the more force you apply the quicker you accelerate.
- Newton’s third law says that for every action there is an equal and opposite reaction. To understand this, see what happens when you drop a tennis ball as the tennis ball hits the floor it causes a downward force on the floor. This is the action; the floor reacts by pushing on the ball the same force but in the opposite direction. Action-Reaction together, the floor and the ball form what’s called the action-reaction pair.