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FORCE AND PRESSURE
RELATIONSHIP  BETWEEN FORCE AND PRESSURE FRICTION EFFECTS OF  FORCE INTRODUCTION FORCE
- playing a guitar - scrubbing the floor - sawing wood - rowing a boat ,[object Object],[object Object],[object Object],[object Object],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
Pressing the switch Kicking a ball Launching rocket Pushing trolley Knocking a  nail
Tug-of-war Raising a flag Pulling a box Opening the door Drawing back a bow
Rowing a boat Scrubbing the  floor Sawing wood Playing guitar
Stops a moving  object or makes a stationary object moves Change the speed of a moving object Change the direction of a moving object Changes the shape permanently Changes the shape temporarily EFFECTS OF A FORCE
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
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 MISCONCEPTION???
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
when a force is applied in the opposite direction  (or different direction), the  moving object will change  its moving direction MISCONCEPTION ???
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
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],MISCONCEPTION ???
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
FRICTION -  Occurs when two surfaces are moving in contact with each other Factors that effect friction Physical condition  of the surface Weight of an object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
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
Examples of friction
RELATIONSHIP BETWEEN FORCE AND PRESSURE ,[object Object],BICYCLE PUMP A force is applied to the pump to produce air pressure Applying force Pull and push

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Force And Pressure

  • 2. RELATIONSHIP BETWEEN FORCE AND PRESSURE FRICTION EFFECTS OF FORCE INTRODUCTION FORCE
  • 3.
  • 4. Pressing the switch Kicking a ball Launching rocket Pushing trolley Knocking a nail
  • 5. Tug-of-war Raising a flag Pulling a box Opening the door Drawing back a bow
  • 6. Rowing a boat Scrubbing the floor Sawing wood Playing guitar
  • 7. Stops a moving object or makes a stationary object moves Change the speed of a moving object Change the direction of a moving object Changes the shape permanently Changes the shape temporarily EFFECTS OF A FORCE
  • 8. 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
  • 9. 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 MISCONCEPTION???
  • 10. 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
  • 11. when a force is applied in the opposite direction (or different direction), the moving object will change its moving direction MISCONCEPTION ???
  • 12. 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
  • 13.
  • 14. 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
  • 15.
  • 16. 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
  • 18.