شرح ساينس الصف الرابع الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس رابعة ابتدائي - ترم أول

لينك تحميل الملزمة
https://drive.google.com/file/d/1YBPcVqVXEkBnEHYNukktAHOIOY6rzkey/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This lesson:
How does an object in motion stop?
A moving object only stops when a force of the same amount is applied to it in the opposite direction of its motion.

The force that stops a moving object may be:





 
Rolling Cars
Activity: To explore the effect of applying different amounts of force to an object.

Tools: Toy car - Measuring ruler.

Steps:
1. Push a toy car hard from a starting point, and record the distance the toy car rolls by using the measuring ruler.
2. Repeat the above step several times, and record the data in a table, then find the average distance.
3. Push a toy car very gently from the same starting point, and record the distance the toy car rolls.
4. Repeat step (3) several times, and record the data in another table, then find the average distance.

Observations:
The car moves a large distance when it is pushed hard as shown in the following table:

• The car moves a small distance when it is pushed gently as shown in the following table:




Conclusions:
• Hard push causes object to travel a long distance.
• Gentle push causes object to travel a small distance.
 
The relationship between energy, work and force:
Example:
- The man exerts a pushing force on the car to move it.
- So, this force transfers energy from his body to the car.
- When he moves the car, this means that he is doing work.

From the previous example, we can conclude that:
• Force transfers energy from one object to another.
• The work done is equal to the amount of energy transferred by a force that is used to move an object.





بالتوفيق
مستر احمد الباشا