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Opening a door, kicking a ball or pushing a switch, all activities in everyday life require forces. It is fundamental in understanding how we interact with the world around us. We also understand how forces affect the state of motion and how they can deform some objects. The NCERT Solutions of Class 8 Science chapter Force and Pressure discusses the various forms of forces, the result of such forces and the concept of pressure.
The 10 exercise questions in the NCERT Solutions of Science Chapter 8 are a mix of simple question-and-answer and fill-in-the-blanks. They are answered in detail by Careers360 experts to help you understand this chapter and are created in clear and easy-to-follow steps, suitable for students to prepare for exams. You can also find the important concepts and the points to remember from the chapter below, which are useful for revision and viewing the concepts covered in the chapter at a glance. The NCERT Solutions of class 8 chapter Force and Pressure, is also available in PDF format for students to download.
Download the NCERT Solutions for class 8 Science chapter Force and Pressure using the link below. The PDF version is well-suited for anytime access and last-minute revision.
Answer:
Two examples of the situation in which the state of motion of an object is changed through a push are as follows:
(a) A table whose position in a room has to be changed is moved by pushing it.
(b) In a match of cricket, the batsman hits the ball by pushing it with a bat.
Two examples of the situation in which the state of motion of an object is changed through a pull are as follows:
(a) In a game of tug of war, both teams try to bring the rope towards their side by pulling it.
(b) A train moves when the engine pulls the rest of the bogies.
Q2. Give two examples of situations in which applied force causes a change in the shape of an object.
Answer:
Two examples of situations in which applied force causes a change in the shape of an object are as follows:
(a) The shape of a rubber band changes (it stretches) once it is pulled from both ends.
(b) The shape of dough is changed before making it into a roti.
Q3. Fill in the blanks in the following statements.
Answer:
(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 either pull or push it.
(d) The north pole of a magnet repels the north pole of another magnet.
muscular, contact, non-contact, gravity, friction, shape, attraction
Answer:
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 the friction of air.
(a) Squeezing a piece of lemon between the fingers to extract its juice.
Answer:
The fingers exert muscular force on the lemon . As an effect of this force, the lemon gets squeezed .
(b) Taking out paste from a toothpaste tube.
Answer:
We use our fingers to apply muscular force on the toothpaste tube . This applied muscular force changes the shape of the tube causing the toothpaste to come out of it.
(c) A load suspended from a spring while its other end is on a hook fixed to a wall.
Answer:
The load pulls the spring . As an effect of this pull, the spring stretches .
(d) An athlete making a high jump to clear the bar at a certain height.
Answer:
The athlete pushes the ground using muscular force. This causes the athlete to rise in the air.
Answer:
While hammering a hot piece the blacksmith applies force on it using the hammer thus causing a change in the shape of the piece of iron. For example, the blacksmith can make a cylindrical block of iron to rectangular block by heating it and hammering.
Answer:
On rubbing the balloon against a piece of synthetic cloth the balloon gains charge . The wall is uncharged and is attracted by the charged balloon since a charged body attracts an uncharged body . The electrostatic force is responsible for the attraction between the balloon and the wall.
Answer:
The forces acting on the bucket are muscular force applied by our hand and gravitational force. The forces acting do not bring a change in the state of the motion as the forces are equal in magnitude and act in the opposite direction.
Answer:
Two forces acting on the rocket are the gravitational force and friction of the air in the atmosphere. The gravitational force pulls the rocket towards the earth and the friction force also opposes the motion of the rocket.
(a) the pressure of water.
(b) the gravity of the earth.
(c) the shape of a rubber bulb.
(d) atmospheric pressure.
Answer:
The rise of water in the dropper is due to atmospheric pressure. The atmospheric pressure is more than the pressure inside the dropper thus pushing the water inside it.
The topics in Chapter 8 of NCERT Class 8 science are as follows-
A force is any interaction that, when unopposed, will change the motion of an object. It can cause an object to move, stop, or change direction. Common examples include pushing a box or pulling a cart.
F=m×a
Where: F is the force applied, m is the mass of the object and a is the acceleration of the object
Force is a vector quantity, meaning it has both magnitude and direction.
Pressure is the force applied per unit area.
The concept of pressure explains why sharp objects like needles or knives can cut through materials more easily than blunt objects. This is because sharp objects concentrate the force over a small area, increasing pressure.
P=F/A
Where: P is pressure, F is the force applied and A is the area over which the force is distributed
The chapter-wise NCERT solutions for all the science chapters are listed here along with their links:
Flat shoes have a larger surface area, so the pressure exerted on the sand is less, making it easier to walk. High heels concentrate pressure in a small area, causing the heels to sink.
A force can deform an object by changing its shape or size, such as stretching a rubber band or compressing a sponge.
Sharp knives have a smaller area of contact, so the pressure applied is greater, making it easier to cut things.
A wet floor reduces friction, which is a type of contact force. Less friction means less grip, making it easier to slip.
Contact forces are those forces that act only when objects are physically touching each other.
Examples:
Muscular force (pushing a table)
Frictional force (brakes applied on a bicycle)
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