Guide of Miracles of Science Class 3

Oxford Teacher's Guide, Guide of Miracles of Science Class 3. Notes for Class Three Subject Science. Unit 7 - Force, Unit 9 - Light, Unit 10 - The Sun

1. Unit No. 7 - Force

1- Choose the correct answer.

  1. The force that we use to blow up a balloon is called a push.
    1. Push
    2. Pull
    3. Friction
    4. Kick
  2. The force that helps us walk on the ground is friction.
    1. Pull
    2. Friction
    3. Push
    4. Press
  3. Rubbing our hands makes them hot.
    1. Soft
    2. Hard
    3. Hot
    4. Smooth
  4. Rolles and wheels make things move easily along a surface.
    1. Friction
    2. Wheels
    3. Brakes 
    4. Rollers
  5. Ball bearings keep parts of the moving machine.
    1. Ball-bearing
    2. Wheels
    3. Friction
    4. Vehicles

2 - Fill in the blanks.

  • We need force to move things.
  • Friction helps us to run and ride bicycles.
  • A greater force will make things move on a rough surface.
  • When two surfaces rub against each other they become hot.
  • Vehicles use the force of machines.

3. If you tried to lift each bag in turn from the floor onto the table

  1. Which bag would need the greatest force ? C
  2. Which bag would need the least forece ? A
  3. Name the kid of force that is acting on the bags when you lift them. Pull 

4. Recalls the Lesson and answer theQuestions.

  1. What is force?
    Ans: A push or a pull is called  a force.
  2. What can a force do?
    Ans: Force can do many things. Force can move things and also stops a moving object.
  3. Name four examples of push and pull from ur daily lives
    Ans: 1. Closing a door.
    2. Moving a car.
    3. Kicking a ball.
    4. LIft a heavy bag.
  4. What is friction?
    Ans: The force which slows down or stops a moving things is called friction.
  5. Describe two ways to reduce friction.
    Ans: 1. Make the surface smoother.
    2. By using wheels to move objects.

2. Unit No. 9 Light

  • Remember and understand.
    • What are luminous objects?
      Ans: Things that give off their own light are known as luminous objects.
    • What are non-luminous objects?
      Ans: Things that they do not give off their own light are known as non=luminous objects.
    • Is the moon a luminous body?
      Ans: No, the moon is a non-luminous body.
  • Remember and Understand?
    • What are rays?
      Ans: Light travels in straight lines called rays.
    • What is the intensity of light?
      Ans: The amount of light falling on something is known as its intensity.
    • How much time does lih= take to travel from the sun to the earth?
      Ans: Light takes to travel from the sun to the earth in about eight minutes.
  • Remember and Answer
    • What is a rainbow?
      Ans: A rainbow is a large arc of seven colours.
    • When do we see a rainbow?
      Ans:  We see a rainbow in the sky during rain. When sunlight shines through tiny raindrops in the air, they break the light into the seven colours of white light.