II. 1. 2. 3. 4. CLASS: VIII EICHER SCHOOL FARIDABAD ASSIGNMENT 2 |HHW] SESSION:2024-25 21 SUBJECT: SCIENCE TOPIC-FORCE Assertion (A) and Reason (R). Answer these questions selecting the Following are Assertion - Reasoning based questions. These consist of two statements appropriate option given below: (a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true and R is not the correct explanation of A (c) A is true but R is false (d) A is False but R is true 1.ASSERTION: The motion imparted to objects was due to the action of a force. REASON: In science, a push or a pull on an object is called a force. 2.ASSERTION: When we push an object like a school bag or lift a bucket of water where does the force come. REASON: This force is caused by the action of muscles in our body. The force resulting due to the action of muscles is known as the muscular force. 3 ASSERTION: When we stop pedalling a bicycle, it gradually slows down and finally comes to a REASON: No force appears to be acting on the object yet their speed gradually decreases and they come to rest after some time. 4.ASSERTION: While taking a penalty kick in football, the player applies a force on the ball and ball move toward the goal. REASON: The goalkeeper tries to save the goal and therefore he applies force to stop the ball. Answer in few words: Which force is responsible for downward movement of a parachutes? Will he come down with the same speed without the parachute? Two thermocol balls held close to each other move away from each other. When they are released, name the force which might be responsible for this phenomenon. Explain. What is force? State the difference between contact force and non-contact force. An archer shoots an arrow in the air horizontally. However, after moving some distance, the arrow falls to the ground. Name the initial force that sets the arrow in motion. Explain why the arrow ultimately falls down. 5. Write all effects of force. III Case study: 1. 2. On Lokesh's birthday Shreya was given charge to amuse children with some little tricks. Shreya sticked balloons to the wall by just rubbing them in her clothes. She bent the water stream from a tap without touching it. She did so by bringing big balloon near to the flowing water. All children were very happy on seeing this little magic. Everybody praised Shreya. How do balloons stick to walls? How Shreya bent the water stream by bringing a big balloon near it and without touching it? Take 4-5 plastic bottles of different shapes and sizes. Join them together with small pieces of glass or rubber tube as shown in Fig. 11.11. Keep this arrangement on a level surface. Now pour water in any one of the bottles. Note whether the bottle in which water is poured gets filled first or all the bottles get filled up simultaneously. Note the level of water in all the bottles from time to time. Try to explain your observations. Fig. 11.11 CLASS VIII/SCIENCE ASSIGNMENT/2024-25/ PAGE 1