11- Force and Pressure | Part 1 | Science | NCERT | Class 8

Hello students, in this blog you can find important summary notes from the Chapter 11, Science , NCERT Book of Class 8. These notes can be used for preparation of various school Competitive Exams, Olympiads and also developing strong Fundamentals.

1. Force : A push or a pull on an object is called a force.

2. Motion is imparted to objects due to the action of a force.

3. Atleast two objects must interact for a force to come into play.

4. Forces applied on an object in the same direction add to one another.

5. If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.

6. The strength of a force is usually expressed by its magnitude.

7. To specify a force, we need to specify both, its magnitude as well as its direction.

8. If the direction or the magnitude of the applied force changes, its effect also changes.

9. The net force on an object is zero if the two forces acting on it in opposite directions are equal.

10. More than one force may be acting on an object. However, the effect on the object is due to the net force acting on it.

11. a force applied on an object may change its speed.

12. If the force applied on the object is in the direction of its motion, the speed of the object increases.

13. 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.

14. 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.

15. A force may bring a change in the state of motion of an object.

16. The state of motion of an object is described by its speed and the direction of motion.

17. The state of rest is considered to be the state of zero speed.

18. The application of force on an object may change its shape.

19. A force :
– may make an object move from rest.
– may change the speed of an object if it is moving.
– may change the direction of motion of an object.
– may bring about a change in the shape of an object.
– may cause some or all of these effects.

20. To apply a force on an object, your body has to be in contact with the object.


To read Part 2 : Click here

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