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Worksheet 2 Friction

Worksheet 2 Friction  A. Fill in the Blanks Friction always acts in the __________ direction to motion. The force of friction is greater between __________ surfaces. The irregularities on surfaces cause __________. __________ are used to reduce friction in machines. A __________ balance measures the force of friction. B. Conceptual Questions Why does a rolling object experience less friction than a sliding object? Why are shoes designed with grooves or tread patterns on their soles? What is the role of spring balance in studying friction? C. Think & Apply  A wooden block is pulled on a rough table and then on a smooth table. Predict and explain the difference in friction. Why do ball bearings reduce friction in machines? If friction didn’t exist, what challenges would we face in daily life? Think of at least three situations. D. Advantages and Disadvantages  List two situations where friction is helpful and two where it is not useful. Suggest two ways to reduce unwant...
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Worksheet 1- Pressure in Liquids and Gases

Pressure in Liquids and Gases Worksheet 1 A. Fill in the Blanks Pressure in liquids __________ with depth. Liquids and gases are also known as __________. Gases exert pressure in __________ directions. Pressure is measured using an instrument called __________. The unit of pressure in the SI system is __________. B. Reasoning-Based Questions Why do deep-sea divers wear specially designed suits? Why do we not feel the atmospheric pressure around us? Why do aeroplanes have pressurised cabins for passengers safety while flying high in the atmosphere? Why are dams constructed thicker at the bottom than at the top? C. Diagram-Based Question Draw a diagram to show how pressure increases with depth in a liquid. In the diagram of a closed container, mark how gas pressure is exerted on all walls.
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                                                                     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 Pr...
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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 num...
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Worksheet-1 (Force and Pressure)

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 Worksheet-1 (Force and Pressure) Q.1.  Q.2.  Q.3. 
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Worksheet -3 (Nutrition in animals)

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  Worksheet -3 
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Worksheet -2 (Nutrition in animals)

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  Worksheet -2 
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