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CBSE Syllabus For Class 8 Science Latest CBSE Class 8 Syllabus For Science
Through this video, you can learn about - By the end of this video you will be able to learn: All these and many more questions will be answered in this. Stars and Solar System: CBSE Class 8 ScienceCelestial objects, types of celestial objects, phases of the moon, light from sun, etc. topics are described in. Chapter Wise CBSE Science Class 8 Solved Question and Answer Based On NCERT. Subjects. Science. Chapter 1. Crop Production and Management.� Recently We started Publishing CBSE Proficiency Test papers and Problem Solving Assessment (PSA) for Maths, Science, Socal Studies, Hindi, English, French and regional langages. We also compile various competative examination materials AIPMT, AIEEE, CA CPT, CTET, NDA, NEET, SCRA, IIT JEE. DISCLAMER: The information displayed is indicative but compiled with care and diligance.

Question 1. Give two examples each of the situations in which you push or pull to change the state of motion of objects. Answer: i Push: We close drawer by pushing. We move a wooden box by pushing. A horse pulls a cart. Question 2. Give two examples of situations in which applied force causes a change in the shape of an object.

Answer: When we apply force on a rubber band to stretch it and on clay to change its shape. Question 3. Fill in the blanks in the following statements. Answer: a pull b attracts c push d repels.

Question 4. An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Answer: a shape b muscular c contact d gravity, friction. Question 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. Answer: a Agents are fingers, object is lemon, effect of force changes the shape of lemon.

Question 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? Answer: The force due to hammering causes the change in the shape of the iron and iron can be moulded in the shape of the required tool. Question 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? Answer: Electrostatic force. Question 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. Answer: Forces acting on bucket are as follows: i Important Question Of Cbse 10th Class Science Name Muscular force of arms acting upward. Question 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. Answer: The forces that act when a rocket leaves launching pad are as follows: i Gravitational force of the earth downward ii Frictional force of air in opposite direction.

Question 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 Answer: d atmospheric pressure. You can add more such situations or replace those given here. One example has been given to help you. Identifying Actions as Push or Pull. Try to push it all by yourself. Can you move it? Now ask one of your friends to help you in pushing it in the same direction [Fig.

Is it easier to move it now? Can you explain why? Does the object move? If it does, note the direction in which it moves. Can you guess which one of you is applying a larger force? Solution: i The box moves with difficulty when we push alone but moves easily if helped by our friend. Thus, force applied on an object in the same direction add to one another.

Thus, if two forces acting in the opposite direction on an object the net force acting on it is the difference between the two forces.

Now, gently push the ball along the level surface Fig. Does the ball begin to move? Push the ball again while it is still moving. Is there any change in its speed? Does it increase or decrease? Next, place your palm in front of the moving ball. Remove your palm as soon as the moving ball touches it. Does your palm apply a force on the ball? What happens to the speed of the ball now?

What would happen if you let your palm hold the moving ball? Solution: When we push the ball along the level surface, the ball begin to move. When we push the ball again while it is still moving, increases its speed.

When we place our palm in front of the moving ball, decreases its speed. Hence, force can change the state of motion. Make the ball move by giving it a push. Now place the ruler from your geometry box in its path as shown in Fig.

In doing so, you would apply a force on the moving ball. Does the ball continue to move in the same direction after it strikes the ruler? Repeat the activity and try to obstruct the moving ball by placing the ruler such that it makes different angles to its path.

In each case note your observations about the direction of motion of the ball after it strikes the ruler. Solution: Ball changes direction after it strikes the ruler. Thus, a force can change direction of motion of a moving object. Column 2 of the Table suggests the manner in which a force can be applied to each object while Column 3 shows a diagram of the action. Try to observe the effect of the force in as many situations as possible. You can also add similar situations using available material from your environment.

Note your observations in Columns 4 and 5 of the table. Studying the Effect of Force on Objects. Solution: From the above actions, we can conclude that force can change the shape of an object. Place the longer side of one of the magnets over three round shaped pencils or wooden rollers as shown in Fig.

Now bring one end of the other magnet near the end of the magnet placed on the rollers. Make sure that the two magnets do not touch each other. Observe what happens. Next, bring the other end of the magnet near the same end of the magnet placed on the rollers Fig.

Note what happens to the magnet placed on the rollers every time another magnet is brought near it. Solution: When unlike poles of the magnet are brought near the other magnet, they attract each other and moves in the direction of another magnet. When like poles of a magnet are brought near to the other magnet, they repel each other and moves in the direction away from the other magnet.

Thus, the force exerted by a magnet on another magnet is a type of non-contact force. Suspend one of the pieces from the edge of a table with the help of a piece of thread Fig. Now hold the other piece of straw in your hand and rub its free end with a sheet of paper. Bring the rubbed end of the straw near the suspended straw. Make sure that the two pieces do not touch each other.

What do you observe? Next, rub the free end of the suspended piece of straw with a sheet of paper. Again, bring the piece of straw that was rubbed earlier with paper near the free end of the suspended straw.

What do you observe now?

Simply said:

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