types of forces

• What are forces that cannot be seen but can be observed through their effects?


  Forces around us
• What happens to objects when they are released from a height due to gravity?


  They fall to the ground
• What is the force that pulls us towards the center of the Earth?

  Gravity
• Why doesn't a woman sitting down fall through her chair despite gravity acting on her?


  There is an upward force known as the normal force
• What is the upward force that acts in the opposite direction to gravity?

  Upthrust
• How does upthrust help a ship in water?


  It prevents the ship from sinking
• What force acts against gravity when a skydiver falls?


  Air resistance
• What is air resistance in the context of skydiving?


  It is the friction between moving objects and the air
• How does surface area affect air resistance experienced by an object?


  A larger surface area experiences greater air resistance
• Why does a parachute help a skydiver land gently?


  It increases air resistance, slowing down the fall
• What are the main forces acting on a skydiver during free fall?

  • Gravity: pulls the skydiver down
  • Air resistance: acts against gravity
• when there is equal force acting on an object is called balancing
• when there is force that is not equal it is called unbalanced
• What is the force that attracts or repels magnets called?

  Magnetic force
• Why can't we see magnetic force directly?


  Because it is invisible, but we can see its effects on magnetic materials
• Where is the magnetic force strongest on a magnet?


  At the poles of the magnet
• What are the differences between magnets and magnetic materials?


  • Magnets attract magnetic materials; magnetic materials do not attract other magnetic materials.
  • Magnets can be repelled by other magnets; magnetic materials cannot be repelled by magnets.
• Will a magnet attract a fork made of steel?


  Yes, because the fork is made of a magnetic material
• What happens when magnets interact with each other?


  They can attract or repel one another
• What is magnetic strength?


  It refers to the ability of a magnet to lift heavier magnetic materials
• How does magnetic strength affect the distance over which a magnet can act?


  Greater magnetic strength allows a magnet to act over a greater distance
• How can you determine the strength of different magnets?


  By finding out how many paper clips they can attract
• How can you record the strength of magnets using a dot plot?


  • Use dots to represent the number of paper clips attracted.
  • Each sticker represents one paper clip.