شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس خامسة ابتدائي - ترم ثاني

لينك تحميل الملزمة
https://drive.google.com/file/d/1eHXP2yq665dXVdl9b9AHwemY93SOsW0m/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Gravity
► Gravity pulls objects toward the center of Earth.
► Gravity affects two objects even when they do not touch each other, such as the moon and Earth.
► There is gravitational attraction (or gravitational pull) between Earth and the moon.

Mass and gravitational force
Gravitational force (gravity) of an object increases, as its mass increases and vice versa.
Example:
Earth and the moon
- The mass of Earth is greater than the mass of the moon, so the gravity of Earth is greater than the gravity of the moon.
- If the mass of the moon becomes twice its real mass,
this leads to:
• The gravitational force between Earth and the moon increases.
• The moon comes closer to Earth and it might even crash into Earth.
Distance and gravitational force
Gravitational force (gravity) decreases, when the distance between two objects increases and vice versa.
Example:
Earth and the moon
- Earth and the moon have a constant distance between each other.
- If the distance between Earth and the moon becomes twice than it is, this leads to:
• The gravitational force (attraction) between Earth and the moon becomes smaller.
Forces
Types of forces
1 Wind turbine
Cause: Wind pushes on the blades of a wind turbine.
Effect: Wind turbine blades move.
2 Magnets
Magnet has a kind of invisible force that cannot be seen, known as magnetism.

- Magnet can exert a pulling force or a pushing force using the force of magnetism as follows:
• Pulling force of magnet:
Cause: A magnet pulls paper clips up.
Effect: Paper clips move to the magnet.
• Pushing force of magnet:
Cause: A magnet pushes away another magnet.
Effect: The other magnet is pushed away.

3 Falling of a cup
Cause: Gravity pulls a cup you drop to the floor.
Effect: The cup falls to the ground.

بالتوفيق
مستر احمد الباشا