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NCERT Solutions for Class 8 Science Chapter 8 Force and Pressure will assist you in scoring more marks. This includes the textbook and their solutions for Force and Pressure Chapter 8 of Class 8 Science, which is made in adherence to the updated syllabus 2023 released by CBSE.
Our solutions offer ample material to help students build a strong foundation and improve their understanding of the subject.
On this page, you will find all the NCERT Solutions for Class 8 Science Chapter 8 Force and Pressure which includes detailed exercise-based solutions. These NCERT Solutions for Class 8 Science are downloadable and easy to access. Our Science experts have meticulously developed these NCERT Solutions for Class 8 to support students in preparing for their Class 8 exams.
NCERT Solutions for Class 8 Science Chapter 8 Force and Pressure
Force and Pressure Class 8 Science NCERT Textbook Questions
Exercise Questions
1. Give two examples each of situations in which you push or pull to change the state of motion of objects.
Solution: We push a door to open it, pull a table to change its position.
2. Give two examples of situations in which applied force causes a change in the shape of an object.
Solution: streching a rubber band, Squeezing a plastic bottle, pressing clay to change its shape.
3. Fill in the blanks in the following statements.
(a) To draw water from a well we have to ____________ at the rope.
(b) A charged body _____________ an uncharged body towards it.
(c) To move a loaded trolley we have to _________________ it.
(d) The north pole of a magnet _______________the north pole of another magnet.
Solution:
(a) To draw water from a well we have to Pull at the rope.
(b) A charged body attracts an uncharged body towards it.
(c) To move a loaded trolley we have to Push it.
(d) The north pole of a magnet repels the north pole of another magnet.
4. An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gaps in the following statements using the following terms.
muscular, contact, non-contact, gravity, friction, shape, attraction
(a) To stretch the bow, the archer applies a force that causes a change in its ______________.
(b) The force applied by the archer to stretch the bow is an example of ______________ force.
(c) The type of force responsible for a change in the state of motion of the arrow is an example of a ____________ force.
(d) While the arrow moves towards its target, the forces acting on it are due to ________________ and that due to ________________ of air.
Solution:
(a) To stretch the bow, the archer applies a force that causes a change in its Shape.
(b) The force applied by the archer to stretch the bow is an example of muscular force.
(c) The type of force responsible for a change in the state of motion of the arrow is an example of a Contact force.
(d) While the arrow moves towards its target, the forces acting on it are due to gravity and that due to friction of air.
5. In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
(b) Taking out paste from a toothpaste tube.
(c) A load suspended from a spring while its other end is on a hook fixed to a wall.
(d) An athlete making a high jump to clear the bar at a certain height.
Solution:
| S.No. | Agent | Object | Effect |
| 1. | Fingers | Lemon | Juice is extracted, change in shape |
| 2. | Fingers | Toothpaste Tube | Toothpaste coming out, change in shape |
| 3. | Load | Spring | Elongation of spring, change in shape |
| 4. | Muscles of athlete | Athlete himself | Change in motion of athlete |
6. A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?
Solution:
The force due to hammering causes the changes the shape of the iron and iron can be moulded in the shape of the desired tool.
7. An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall?
Solution:
The force responsible here is electrostatic force. A charged object has the ability to attract an uncharged one. When we rub an inflated balloon with a synthetic cloth, it acquires an electric charge. When this charged balloon is pressed onto a wall, it sticks to the wall. This demonstrates the presence of electrostatic force between the charged balloon and the wall.
8. Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket do not bring a change in its state of motion.
Solution:
When we hold the bucket containing water above ground level in our hand, two forces come into act.
1. Muscular force – for holding the bucket of water above the ground, we use muscular force.
2. Gravitational force – Muscular force acts against the force of gravity that pulls the bucket towards the ground.
These forces do not bring any change in the state of motion because both of them are acting in equal and opposite directions and thus they cancel each other’s effect. Hence, there is no change in the state of motion.
9. A rocket has been fired upwards to launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad.
Solution:
Two forces acting on the rocket immediately after leaving the launching pad are-
1. Gravitational force
2. Force of Friction
10. When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to
(a) pressure of water.
(b) gravity of the earth.
(c) shape of rubber bulb.
(d) atmospheric pressure.
Solution: (d) atmospheric Pressure.
Summary
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