FORCES and MOTION:
Big idea:
Newton's three laws of motion describe the relationship between force and motion.
Les trois lois du mouvement de Newton décrivent la relation entre la force et le mouvement.
Newton's three laws of motion describe the relationship between force and motion.
Les trois lois du mouvement de Newton décrivent la relation entre la force et le mouvement.
Inquiry Questions:
• What is the différence between motion by balanced forces and motion caused by unbalanced forces?
• What is the différence between motion by balanced forces and motion caused by unbalanced forces?
- Quelle est la différence entre un mouvement provoqué par des forces équilibrées et un mouvement provoqué par des forces non équilibrées?
- Observes-tu des forces équilibrées et des forces non équilibrées dans ton quotidien et dans tes activités?
soccer and Newton's three laws explained - CLICK HERE
BALANCE VS UNBALANCE FORCES
Click HERE for a great website that explains BALANCED and UNBALANCED forces
NEWTON's LAWS of MOTION
Newton's Laws
Isaac Newton (1643-1727) is a British physicist known to have established the three universal laws of motion in 1688. These three laws, named Newton's laws, helped to develop the basis of classical mechanics. |
Les lois de Newton
Isaac Newton (1643-1727) est un physicien britannique reconnu pour avoir établi les trois lois universelles du mouvement en 1688. Ces trois lois, dites lois de Newton, ont permis d'élaborer la base de la mécanique classique. |
Newton's first law: INERTIA |
première loi de Newton |
Newton's first law, or the principle of inertia, indicates that objects will stay stopped or in constant motion until acted upon by an outside force.
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La première loi de Newton, ou le principe d'inertie, indique que tout corps conserve son état de repos ou de mouvement uniforme, à moins que quelque force n'agisse sur lui .
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Click HERE for a great website on NEWTON'S FIRST LAW
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Newton's first law - REAL WORLD EXAMPLES
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La vidéo ci-dessous montre que dans la station spatiale internationale, les objets restent au repos ou continuent leur mouvement à vitesse constante dans le référentiel de la station tant qu'ils ne sont pas soumis à une force. [Mais, les objets ne sont-ils pas soumis à leur poids dans la station internationale ?]
NEWTON'S second LAW |
Deuxième loi de Newton |
• only an unbalanced force causes acceleration
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• seule une force non équilibrée peut causer une accélération
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Newton's second law - Real world examples:
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Newton's third law:
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Troisième loi de newton: action et réaction |
• every force has an equal and opposite reaction force
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Newton's third law - Real world examples:
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Other examples of action and reaction forces:
• A swimmer swimming forward: the swimmer pushes against the water (action force), the water pushes back on the swimmer (reaction force) and pushes her forward.
• A ball is thrown against a wall: The ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off.
• A person is diving off a raft: The person puts a force on the raft (action force) pushing it, and the raft puts a force on the diver (reaction force) pushing them in the opposite direction.
• A person pushes against a wall (action force), and the wall exerts an equal and opposite force against the person (reaction force).
• The Space Shuttle engines push out hot gases (action force), and the hot gases put a force on the shuttle engines (reaction force) so the shuttle lifts (there is no sling shot doing it!)
• A swimmer swimming forward: the swimmer pushes against the water (action force), the water pushes back on the swimmer (reaction force) and pushes her forward.
• A ball is thrown against a wall: The ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off.
• A person is diving off a raft: The person puts a force on the raft (action force) pushing it, and the raft puts a force on the diver (reaction force) pushing them in the opposite direction.
• A person pushes against a wall (action force), and the wall exerts an equal and opposite force against the person (reaction force).
• The Space Shuttle engines push out hot gases (action force), and the hot gases put a force on the shuttle engines (reaction force) so the shuttle lifts (there is no sling shot doing it!)
CLICK HERE FOR A GREAT WEBSITE THAT EXPLAINS GRAVITY AND FRICTION