1. Give two examples each of situations in which you push or pull to changethe state of motion of objects.2. Give two examples of situations in which applied force causes a change inthe shape of an object.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.© NCERTnot to be republishedSCIENCE1444. An archer stretches her bow while taking aim at the target. She thenreleases the arrow, which begins to move towards the target. Based onthis information fill up the gaps in the following statements using thefollowing terms:muscular, contact, non-contact, gravity, friction, shape, attraction(a) To stretch the bow, the archer applies a force that causes a changein 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 thearrow is an example of a ———— force.(d) While the arrow moves towards its target, the forces acting on it aredue to ———— and that due to ———— of air.5. In the following situations identify the agent exerting the force and theobject 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 fixedto a wall.(d) An athlete making a high jump to clear the bar at a certain height.6. A blacksmith hammers a hot piece of iron while making a tool. How doesthe force due to hammering affect the piece of iron?7. An inflated balloon was pressed against a wall after it has been rubbedwith a piece of synthetic cloth. It was found that the balloon sticks to thewall. What force might be responsible for the attraction between the balloonand the wall?8. Name the forces acting on a plastic bucket containing water held aboveground level in your hand. Discuss why the forces acting on the bucket donot bring a change in its state of motion.9. A rocket has been fired upwards to launch a satellite in its orbit. Namethe two forces acting on the rocket immediately after leaving the launchingpad.10. When we press the bulb of a dropper with its nozzle kept in water, air inthe dropper is seen to escape in the form of bubbles. Once we release thepressure on the bulb, water gets filled in the dropper. The rise of water inthe dropper is due to(a) pressure of water(b) gravity of the earth(c) shape of rubber bulb(d) atmospheric pressureE X E R C I S E S© NCERTnot to be republished
Question
- Give two examples each of situations in which you push or pull to changethe state of motion of objects.2. Give two examples of situations in which applied force causes a change inthe shape of an object.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.© NCERTnot to be republishedSCIENCE1444. An archer stretches her bow while taking aim at the target. She thenreleases the arrow, which begins to move towards the target. Based onthis information fill up the gaps in the following statements using thefollowing terms:muscular, contact, non-contact, gravity, friction, shape, attraction(a) To stretch the bow, the archer applies a force that causes a changein 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 thearrow is an example of a ———— force.(d) While the arrow moves towards its target, the forces acting on it aredue to ———— and that due to ———— of air.5. In the following situations identify the agent exerting the force and theobject 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 fixedto a wall.(d) An athlete making a high jump to clear the bar at a certain height.6. A blacksmith hammers a hot piece of iron while making a tool. How doesthe force due to hammering affect the piece of iron?7. An inflated balloon was pressed against a wall after it has been rubbedwith a piece of synthetic cloth. It was found that the balloon sticks to thewall. What force might be responsible for the attraction between the balloonand the wall?8. Name the forces acting on a plastic bucket containing water held aboveground level in your hand. Discuss why the forces acting on the bucket donot bring a change in its state of motion.9. A rocket has been fired upwards to launch a satellite in its orbit. Namethe two forces acting on the rocket immediately after leaving the launchingpad.10. When we press the bulb of a dropper with its nozzle kept in water, air inthe dropper is seen to escape in the form of bubbles. Once we release thepressure on the bulb, water gets filled in the dropper. The rise of water inthe dropper is due to(a) pressure of water(b) gravity of the earth(c) shape of rubber bulb(d) atmospheric pressureE X E R C I S E S© NCERTnot to be republished
Solution
- Examples of situations in which you push to change the state of motion of objects:
- Pushing a car to start it.
- Pushing a swing to make it move.
Examples of situations in which you pull to change the state of motion of objects:
- Pulling a door to open it.
- Pulling a wagon to make it move.
- Examples of situations in which applied force causes a change in the shape of an object:
- Squeezing a stress ball to change its shape.
- Stretching a rubber band to elongate it.
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(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.
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(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.
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(a) Agent exerting the force: Fingers Object on which it acts: Piece of lemon Effect of the force: Extracting juice from the lemon. (b) Agent exerting the force: Hand Object on which it acts: Toothpaste tube Effect of the force: Taking out paste from the tube. (c) Agent exerting the force: Load Object on which it acts: Spring Effect of the force: Stretching the spring. (d) Agent exerting the force: Athlete Object on which it acts: Bar Effect of the force: Clearing the bar at a certain height.
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The force due to hammering causes the hot piece of iron to change its shape and become more malleable.
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The force responsible for the attraction between the balloon and the wall is static electricity.
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The forces acting on a plastic bucket containing water held above ground level in your hand are gravity pulling the bucket downwards and the upward force exerted by your hand. These forces do not bring a change in the bucket's state of motion because they are balanced, resulting in a state of equilibrium.
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The two forces acting on the rocket immediately after leaving the launching pad are the force of gravity pulling it downwards and the force of propulsion pushing it upwards.
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The rise of water in the dropper is due to the atmospheric pressure. When the pressure on the bulb is released, the higher atmospheric pressure pushes the water into the dropper.
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