Science class activities
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Explanation on how the Moon move around the Earth and how the Earth move around the Sun. |
Pupils draw the movement of the Moon and the Earth.
Discussion
Activity at home
Aim: to simulate and observe the phase of the Moon
Procedure:
1 This activity must be carried out in a dark room.
2 A stick is pierced through the centre of a polystyrene ball to represent the Moon.
3 An electric torch is placed in the room to represent the Sun.
4 The polystyrene ball is held by the observer at arm's length between the torch and his eyes.
5 The half surface of the ball facing the observer is observed.
6 The observations are recorded in the form of drawings.
7 Together with his arm, the observer turns 45 degree to the left (anticlockwise).
He observes the surface of the ball facing him and records its apperarance.
8 Step 7 is repeated for all the other positions given in the following diagram.
Inferences:
1 We see different parts of the Moon at different times because the angles between the Moon, the Earth and the Sun are changing all the time.
2 When the Moon is farthest from the Sun, half of the surface of the Moon is illuminated. This is known as the full moon.
Conclusion:
The phases of the Moon are caused by the movement of the Moon around the Earth and its changing position relative to the Sun.
Activity
Aim : To investigate the occurence of day and night due to the rotation of the Earth.
Procedure:
1 A globe and an electric torch are used to carry out the activity.
2 The apparatus is set up as shown below.
3 The globe is spinned slowly from the west to the east.
4 The observations are recorded.
Observation:
Inferences:
1 The side of the globe facing towards the torch is lighted. The light represents daytime.
2 The side of the globe facing away from the torch is in darkness. The darkness represents night-time.
Conclusion:
The rotation of the Earth on its axis causes the occurrence of day and night.
Activity at home
Aim: to simulate and observe the phase of the Moon
Procedure:
1 This activity must be carried out in a dark room.
2 A stick is pierced through the centre of a polystyrene ball to represent the Moon.
3 An electric torch is placed in the room to represent the Sun.
4 The polystyrene ball is held by the observer at arm's length between the torch and his eyes.
5 The half surface of the ball facing the observer is observed.
6 The observations are recorded in the form of drawings.
7 Together with his arm, the observer turns 45 degree to the left (anticlockwise).
He observes the surface of the ball facing him and records its apperarance.
8 Step 7 is repeated for all the other positions given in the following diagram.
Inferences:
1 We see different parts of the Moon at different times because the angles between the Moon, the Earth and the Sun are changing all the time.
2 When the Moon is farthest from the Sun, half of the surface of the Moon is illuminated. This is known as the full moon.
Conclusion:
The phases of the Moon are caused by the movement of the Moon around the Earth and its changing position relative to the Sun.
Activity
Aim : To investigate the occurence of day and night due to the rotation of the Earth.
Procedure:
1 A globe and an electric torch are used to carry out the activity.
2 The apparatus is set up as shown below.
3 The globe is spinned slowly from the west to the east.
4 The observations are recorded.
Observation:
Inferences:
1 The side of the globe facing towards the torch is lighted. The light represents daytime.
2 The side of the globe facing away from the torch is in darkness. The darkness represents night-time.
Conclusion:
The rotation of the Earth on its axis causes the occurrence of day and night.
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