شرح ساينس الصف الخامس الابتدائي لغات مستر احمد الباشا
ساينس خامسة ابتدائي
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In this part :
Gravity
► 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.
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.
Friction
It is a force that opposes the motion of a body across a solid surface or through a gas or liquid.
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.
Air resistance
It is a force that opposes the movement of an object as it passes through air.
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