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force and pressure

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FORCE & PRESSURE :

FORCE & PRESSURE MADE BY - CHIRAG CHAUDHARY (VIII-A) 9

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- playing a guitar - scrubbing the floor - sawing wood - rowing a boat A pull is when we apply a force to move an object towards our body A force to move an object away from our bodies FORCE A force is a push or a pull or both. A force cannot be seen but we can feel and observe the effects of the force. PUSH PULL COMBINATION OF PUSH AND PULL

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Pressing the switch Kicking a ball Launching rocket Pushing trolley Knocking a nail

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Tug-of-war Raising a flag Pulling a box Opening the door Drawing back a bow

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Rowing a boat Scrubbing the floor Sawing wood Playing guitar

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Stretch a rubber band After An object that will return to its original shape and size after being squeezed, pressed, twisted and stretched is elastic After After Press a sponge Squeeze a spring

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Drop a glass After After Tear a piece of paper After Crush an empty can An object that will not return to its original shape and size after being squeezed, pressed, twisted and stretched is inelastic

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A solid cannot be compressed or stretched!! CHILDREN’S MISCONCEPTION EXPLANATION The shape of a solid object changes when a force is applied to it whether it’s temporarily or permanently Example: crushing a can – changes the shape permanently

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when a force is applied in the opposite direction (or different direction), the moving object will change its moving direction

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Misconception? A force is needed to keep an object moving with a constant speed Explanation: You do not need forces to move at a steady speed but if you keep the same speed yet change direction, like a moon around a planet, then you have a force acting on you anyway An object will move faster when a force is applied It moves in the same direction as the applied force

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A stationary ball will move when it is kicked Moves in the same direction as the applied force The moving ball will stop when an equal force is applied in the opposite direction of its motion

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Force is a property of an object. An object has force and when it runs out of force it stops moving EXPLANATION an object at rest or in motion will remain in that state unless an external force is applied to the object Newton 1 st Law

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MISCONCEPTION??? Friction is only present when something is rubbing against a moving object EXPLANATION Occurs when two surfaces are moving in contact with each other

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Examples of friction

RELATIONSHIP BETWEEN FORCE AND PRESSURE:

RELATIONSHIP BETWEEN FORCE AND PRESSURE AIR PRESSURE BICYCLE PUMP A force is applied to the pump to produce air pressure Applying force Pull and push

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THANKYOU & HAVE A NICE DAY THE END

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