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Lesson 4 – Newton’s Third Law

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Presentation transcript:

AIM: ? OBJ: Given notes and activity sheet SWBAT with 70% accuracy DN: ACT: HW:

Newton’s Laws of Motion Newton’s 3 rd Law of Motion Action/Reaction : for every action there is an equal but opposite reaction. Action & Reaction Pairs 1)jumping 2)paddling Action & reaction forces do not cancel out when they are acting on different objects.

Newton’s Cradle “For Every Action There Is An Equal But Opposite Reaction”

Action & reaction forces do not cancel out when they are acting on different objects. Action & reaction forces do cancel out when they are acting on the same object.

Newton’s Laws of Motion Momentum: a measure (quantity) of motion, where: momentum = mass x velocity (ρ = m·v) kg·m/s kg m/s more momentum ~ harder to stop Example: ball (low mass) ~ less momentum car (high mass) ~ more momentum moving arrow (high velocity) ~ more momentum Note: Conservation means to stay the same; no change. Law of Conservation of Momentum: states that in the absence of outside forces, the total momentum of objects that interact does not change. The amount of momentum is the same before and after they interact.

Newton’s Laws of Motion Collisions with Two Moving Objects: Total momentum is conserved. The momentum of one train car decreases while the momentum of the other car increases. Collisions with One Moving Object: Total momentum is conserved. All of the momentum has been transferred from the moving car to the initially stationary car. Collisions with Connected Objects: Since the mass is doubled and the velocity is divided in half, the total momentum remains the same.

Newton’s Laws of Motion: Summary 1)Inertia = rest/moving, stay the same 2) F=ma 3) Action/Reaction = equal but opposite 4) Momentum = mv