FORCE & PRESSURE CLASS 8 Hints to answer the give reason type questions based on pressure class 8 Pressure in solids Check whether the area of contact is increasing or decreasing in given situation Write; Pressure is inversely proportional to area Write Increase or decrease in pressure according to the given area. Conclusion Pressure in liquids Identify the property that matches with the given statement. Check whether the pressure = force/area formula can be used. Conclusion Pressure in gases Check in the statement, whether the surrounding is at low air pressure or the object. Write, Air flows from high pressure to low pressure Write the correct flow of air taking place Conclusion
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PRACTICE WORKSHEET (CLASS - VIII) TOPIC – FORCE AND PRESSURE 1. When a force acts on a moving object, it can make the object a) move faster b) slow down c) stop d) all of these 2. Name the type of forces involved in the following : a) A horse pulling a cart _________________________ b) A moving boat coming to rest when rowing is stopped ___________________ c) A coin falling to the ground on slipping from hand ______________________ d) A sticker attached to steel almirah without glue _________________________ 3. Two students fought over a lunch box, both started pulling it from opposite ends but the box didn't move from its place. What will you infer about the magnitude and direction of the forces? 4. 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. Assertion / Reason : For question numbers 5, two sta
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Body movements
Body movements Q.1. What do you understand by the term ‘Movement’ and how is it different from the term ‘Locomotion’? Ans. A change in the position of an object is called ‘Movement’ like movement of hands while playing, doing exercise, blinking of eyes etc. The ability of living being to move its body from one place to another is called ‘Locomotion’ like living beings walk, run, crawl etc. Q.2. What are Joints and write a short note on each type of joint present in our body? Ans. Bones can not bend. We can bend and move our body only at some points where bones meet, such points are called joints. There are 4 types of joint present in our body: A ball and socket joint - this is the joint in which ball like surface of one bone is fitted into hollow space of another bone (also called socket). Such a joint allows movements in all directions. These can be found in shoulder joint, hip joint etc. A pivotal joint - this is the joint which allows rotation, twisting, extension an