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NCERT solutions Science Textbook For Class 8 chapter 11 Force and Pressure

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Chapter 11 - Force and Pressure

Pages 142 - 143

Give two examples each of situations in which you push or pull to change the state of motion of objects.

Q 1 | Page 142 | view solution

Give two examples of situations in which applied force causes a change in the shape of an object.

Q 2 | Page 142 | view solution

Fill in the blanks in the following statements.

To draw water from a well we have to _________ at the rope.

Q 3.1 | Page 142 | view solution

Fill in the blanks in the following statements.

A charged body ________ an uncharged body towards it.

Q 3.2 | Page 142 | view solution

Fill in the blanks in the following statements.

To move a loaded trolley we have to _________ it.

Q 3.3 | Page 142 | view solution

Fill in the blanks in the following statements.

The north pole of a magnet ________ the north pole of another magnet.

Q 3.4 | Page 142 | view solution

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

To stretch the bow, the archer applies a force that causes a change in its _______.

Q 4.1 | Page 143 | view solution

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

The force applied by the archer to stretch the bow is an example of ________ force.

Q 4.2 | Page 143 | view solution

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

The type of force responsible for a change in the state of motion of the arrow is an example of a _______ force.

Q 4.3 | Page 143 | view solution

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

While the arrow moves towards its target, the forces acting on it are due to ________ and that due to ________ of air.

Q 4.4 | Page 143 | view solution

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.

Squeezing a piece of lemon between the fingers to extract its juice.

Q 5.1 | Page 143 | view solution

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in case.

Taking out paste from a toothpaste tube.

Q 5.2 | Page 143 | view solution

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in given case

A load suspended from a spring while its other end is on a hook fixed to a wall.

 

Q 5.3 | Page 143 | view solution

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in given case

An athlete making a high jump to clear the bar at a certain height.

Q 5.4 | Page 143 | view solution

A blacksmith hammers a hot piece of iron while making a tool. How does the force due to hammering affect the piece of iron?

Q 6 | Page 143 | view solution

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?

Q 7 | Page 143 | view solution

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.

Q 8 | Page 143 | view solution

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.

Q 9 | Page 143 | view solution

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

Q 10 | Page 143 | view solution

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