Pull and Gravity Around Us | Grade 5 | Unit 4 - Concept 1 - Lesson 4 | Science

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

لينك تحميل الملزمة
https://drive.google.com/file/d/1ffZh...

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
Gravity
►Gravity is a force that pulls objects with more mass toward objects with less mass.
► You cannot see gravity, but you know it is there because you can see its effects.

Examples:
- The Sun pulls all planets toward it.
- Gravity keeps our planet in an orbit around the Sun.
- Gravity keeps our atmosphere around Earth.
- On Earth, gravity pulls everything (such as humans, rocks, water bodies, animals,
chairs, .... etc.) and holds them to the ground toward the center of Earth.
- Skydivers and their parachutes are pulled downward toward Earth's surface.

Magnetism, friction, and air resistance
Magnetism
Magnetism is a force that attracts metal objects made of iron, nickel or cobalt by pulling on them.
Example:
Some iron nails can be attracted to a magnet due to its pulling force on them.

Friction
• Friction is a force generated between two touching surfaces.
• Friction slows the movement of objects.


Example:
A bicycle brake pulls back the movement of the tires by friction when the bicycle brake rub against the tires.
Air resistance
Air resistance is considered as a type of friction force.

Example:
Skydiver releases parachute to slow his drop, where:
- When the skydiver opens his parachute, it gets filled with air due to the upward flow of wind forming air resistance to the parachute.
- The air resistance pulls the skydiver backward and slows his fall to Earth's surface


 
بالتوفيق
مستر احمد الباشا