PHYSICS- FORCE AND LAWS OF MOTION IX
PREPARED BY-MRS KASHMIRA HALDAR (DAV, AIROLI)
1
DAYANAND ANGLO VEDIC PUBLIC SCHOOL, AIROLI
STD-IX (2020-2021)
FORCE AND LAWS OF MOTION (NOTES AND ASSIGNMENTS)
Students,
Sending you the notes , assignments ,worksheet and portfolio for ‘Force and
Laws of Motion’ chapter 9 NCERT Text.
General Instructions-
Go through the notes. Follow the day wise task as given to you. Read the notes
and write down. Do reading and writing practice day wise. Refer the notes,
equations for your assignments. Practice the numerical. Note down all the
doubts you have to discuss. The notes, home assignments and worksheet can
be written in Physics notebook. Worksheet to be done only after the discussion
in online classes.
For CBSE IX th Curriculum and Revised syllabus ( 2020-21), visit cbse.nic.in
website. For revision question bank refer diksha portal.
DAY 1 TASK
Force
*A force is an effort, push or pull that changes the state of an object at rest or at motion. It
can change an object’s direction and velocity.
Effects of Force- (i) Force can change the state of motion of an object, (ii) Force can change
the direction of the moving object, (iii) Force can change the speed of the moving object
(iv) Force can change the shape and size of the object
Balanced and Unbalanced Forces
*Unbalanced forces acting on an object change its speed and/or direction of motion. It moves
in the direction of the force with the highest magnitude and the net resultant force is not zero.
*For example: If we have a box, and in order to move it, we need to apply a force. Let’s say,
the force of unequal magnitude is acting on an object from opposite sides. This time both the
forces will not cancel each other effect as their magnitude is not the same. So, the resultant
force will not be zero and will also make the body move in the direction of greater force
applied.
*Balanced Force : The equal and opposite force acting on a body, where there will be no net
effective force acting on the object or the resultant force is zero. Balanced forces do not cause
a change in state of motion, but may cause change in shape of the object.
*For example: If we have a box, and in order to move it, we apply force. Let’s say, the same
force is acting on an object from opposite sides. Then both forces will cancel each other’s
effect as their magnitude is the same and both are acting from opposite sides. So, the resultant
force will be zero.
Assignment1 Note- complete the given activity on or before 15th of sep 2020
Portfolio- Sketches or cartoon drawings showing examples of balanced , unbalance force
or effects of force . The pic shown below is an example for reference.
Answers
PHYSICS- FORCE AND LAWS OF MOTION IX
PREPARED BY-MRS KASHMIRA HALDAR (DAV, AIROLI)
1
DAYANAND ANGLO VEDIC PUBLIC SCHOOL, AIROLI
STD-IX (2020-2021)
FORCE AND LAWS OF MOTION (NOTES AND ASSIGNMENTS)
Students,
Sending you the notes , assignments ,worksheet and portfolio for ‘Force and
Laws of Motion’ chapter 9 NCERT Text.
General Instructions-
Go through the notes. Follow the day wise task as given to you. Read the notes
and write down. Do reading and writing practice day wise. Refer the notes,
equations for your assignments. Practice the numerical. Note down all the
doubts you have to discuss. The notes, home assignments and worksheet can
be written in Physics notebook. Worksheet to be done only after the discussion
in online classes.
For CBSE IX th Curriculum and Revised syllabus ( 2020-21), visit cbse.nic.in
website. For revision question bank refer diksha portal.
DAY 1 TASK
Force
*A force is an effort, push or pull that changes the state of an object at rest or at motion. It
can change an object’s direction and velocity.
Effects of Force- (i) Force can change the state of motion of an object, (ii) Force can change
the direction of the moving object, (iii) Force can change the speed of the moving object
(iv) Force can change the shape and size of the object
Balanced and Unbalanced Forces
*Unbalanced forces acting on an object change its speed and/or direction of motion. It moves
in the direction of the force with the highest magnitude and the net resultant force is not zero.
*For example: If we have a box, and in order to move it, we need to apply a force. Let’s say,
the force of unequal magnitude is acting on an object from opposite sides. This time both the
forces will not cancel each other effect as their magnitude is not the same. So, the resultant
force will not be zero and will also make the body move in the direction of greater force
applied.
*Balanced Force : The equal and opposite force acting on a body, where there will be no net
effective force acting on the object or the resultant force is zero. Balanced forces do not cause
a change in state of motion, but may cause change in shape of the object.
*For example: If we have a box, and in order to move it, we apply force. Let’s say, the same
force is acting on an object from opposite sides. Then both forces will cancel each other’s
effect as their magnitude is the same and both are acting from opposite sides. So, the resultant
force will be zero.
Assignment1 Note- complete the given activity on or before 15th of sep 2020
Portfolio- Sketches or cartoon drawings showing examples of balanced , unbalance force
or effects of force . The pic shown below is an example for reference.
Answer:
what a.long question wait