Contact & Non-Contact Forces
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- Laura, what's wrong ? You seem to be worried.
- Oh.. I'll help you in this. I'll teach you an easy method to remember them.
- Mom, I am unable to remember the types of forces.
- Thank you, Mom
- Observe the examples I show you, only then you will know what they are.
- So, let me start with FORCE. Force is a Pull or Push that affects an object in some way.
- Laura, do you feel your hair being pulled by the TV Screen ?
- Yes, Mom
- Notice this Laura. For holding the books, my muscles are being used too. So, it can be also called MUSCULAR FORCE.
- See, as I am holding the books, there is a physical contact between the books and my hand, so it is called CONTACT FORCE.
- Yes, Mom. This is exactly what I asked ma'am that day.
- Laura, I am able to stand because the gravity is pulling me towards the ground, So, it can be also called GRAVITATIONAL FORCE. The objects need not always be in physical contact.
- See, now the books fell down. So, there is no physical contact between the books and my hand, It is called NON - CONTACT FORCE.
- Yes Mom. I am able to relate these with my Textbook.
- It's ok, Darling. It happened because of FRICTIONAL FORCE. It is the force that opposes motion when two or more objects are in contact move in respect to each other.
- It is because of ELECTROSTATIC FORCE. Before you came into the room, I was watching TV. So, the TV is the Charged Body and your hair is Uncharged. Hence, it was attracting your hair.
- Mom, I tripped over the books. Ooouuch !! It hurts..
- Yes Mom, I do
- MECHANICAL FORCE, the force exerted by machines.Eg - Engine of a Car, Closing and Opening of Door
- I will explain them orally as I don't have the materials to show you as examples.
- Is it still hurting ?
- You're welcome, Laura
- Thank you so much, Mom. I understood FORCE and TYPES OF FORCE properly by the examples you gave me today.
- MAGNETIC FORCE, the force exerted by a Magnet or Magnetic substances.Eg - Magnet attracts Iron,
- It is better now. Mom, there are 2 more forces left.
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