# Force and Pressure worksheet for class 8

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## Force and Pressure worksheet for class 8 Important Topics

• Force – A Push or a Pull
• Forces are due to an Interaction
• Exploring Forces
• A Force can Change the State of Motion
• Force can Change the Shape of an Object
• Contact Forces
• Non-contact Forces
• Pressure
• Pressure exerted by Liquids and Gases
• Atmospheric Pressure

## Some important Facts about Force and Pressure worksheet for class 8

1. Make a 50 cm × 50 cm bed of dry sand about 10 cm in thickness. Make sure that its top surface is levelled. Take a wooden or a plastic stool. Cut two strips of graph paper each with a width of 1 cm. Paste them vertically on any leg of the stool – one at the bottom and the other from the top. Now gently put the stool on the sand bed with its legs resting on the sand. Increase the size of sand bed if required. Now put a load, say a school bag full of books, on the seat of the stool. Mark the level of sand on the graph strip. This would give you the depth, if any, to which the legs of stool sink in sand. Next, turn the stool upside down so that now it rests on its seat on the sand bed. Note the depth to which the stool sinks now. Next, put the same load on the stool and note the depth to which it sinks in the sand. Compare the pressure exerted by the stool in the two situations.

2. Take a tumbler and fill it with water. Cover the mouth of the tumbler with a thick card similar to that of a postcard. Hold the tumbler with one hand while keeping the card pressed to its mouth with your other hand. Turn the tumbler upside down while keeping the card pressed to its mouth. Make sure that the tumbler is held vertical. Gently remove the hand pressing the card. What do you observe? Does the card get detached allowing the water to spill? With a little practice you will find that the card continues to hold water in the tumbler even after it is not supported by your hand. Also try this activity by using a piece of cloth to hold the tumbler in an upside down position.

## NCERT Class 8 Science Solved Worksheets

• Chapter 1 – Crop Production and Management
• Chapter 2 – Microorganisms : Friend and Foe
• Chapter 3 – Synthetic Fibres and Plastics
• Chapter 4 – Materials : Metals and Non-Metals
• Chapter 5 – Coal and Petroleum
• Chapter 6 – Combustion and Flame
• Chapter 7 – Conservation of Plants and Animals
• Chapter 8 – Cell – Structure and Functions
• Chapter 9 – Reproduction in Animals
• Chapter 10 – Reaching The Age of Adolescence
• Chapter 11 – Force and Pressure
• Chapter 12 – Friction
• Chapter 13 – Sound
• Chapter 14 – Chemical Effects of Electric Current
• Chapter 15 – Some Natural Phenomena
• Chapter 16 – Light
• Chapter 17 – Stars and The Solar System
• Chapter 18 – Pollution of Air and Water

## Pressure

You have learnt in Class VII that strong winds during a storm or a cyclone can blow away even the roof-tops. You also learnt that winds and cyclones are caused by the differences in air pressure. Is there any relation between pressure and force? Let us find out

Note that the area is in the denominator in the above expression. So, the smaller the area, larger the pressure on a surface for the same force. The area of the pointed end of the nail is much smaller than that of its head. The same force, therefore, produces a pressure sufficient to push the pointed end of the nail into the wooden plank. Can you explain now why shoulder
bags are provided with broad straps and not thin strap? And, why the tools meant for cutting and piercing always have sharp edges?

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