โ๏ธ Physics ยท Grade 9 ยท 45 minutes ยท Dr. Sara Ahmed
๐ Learning Objectives
โข Understand Newton's Third Law of Motion and state it precisely
โข Identify action-reaction force pairs in real-world scenarios
โข Apply Newton's Third Law to solve basic physics problems
โข Relate the law to everyday experiences in the UAE/real-world context
๐ Introduction
When the ISRO Space Centre launches a rocket into space, the rocket's engines push gas downward with tremendous force. Simultaneously, that same gas pushes the rocket upward. This is Newton's Third Law in action โ one of the most important principles in all of physics.
๐ก Key Concept
Newton's Third Law: For every action, there is an equal and opposite reaction. When Object A exerts a force on Object B, Object B simultaneously exerts a force equal in magnitude but opposite in direction on Object A.
๐ข The Formula
F_action = โF_reaction
This means the forces are always equal in magnitude (size) and always opposite in direction. However, they act on different objects โ this is the most important point that students often miss.
๐ Real-World Examples (Indian Context)
1. Camel walking in the desert: The camel's feet push backward on the sand; the sand pushes forward on the camel's feet.
2. Dubai Metro train: The train's wheels push backward on the track; the track pushes forward on the wheels.
3. Swimming in a pool: You push water backward with your hands; the water pushes you forward.
โ
Check Your Understanding ยท Q1 of 3
A car accelerates forward. According to Newton's Third Law, what is the reaction force?
A. Air resistance pushing backward on the car
B. The road pushing backward on the tires
C. The engine force
D. Gravity pulling the car down
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