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Section 3. For every action force, there is an equal and opposite reaction force Jumping on a trampoline cause the trampoline to exert an equal force.

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Presentation on theme: "Section 3. For every action force, there is an equal and opposite reaction force Jumping on a trampoline cause the trampoline to exert an equal force."— Presentation transcript:

1 Section 3

2 For every action force, there is an equal and opposite reaction force Jumping on a trampoline cause the trampoline to exert an equal force upward The forces will always be equal but in opposite directions

3 Action and Reaction forces do not cancel each other out This is because the force is equal but the force is being applied to different objects

4 In aerospace engineering, the principal of action and reaction is very important. Newton's third law explains the generation of thrust by a rocket engine thrust Hot exhaust gas is produced through the combustion of a fuel combustion The hot exhaust gas flows through the rocket nozzle and is accelerated to the rear of the rocket nozzle In re-action, a thrusting force is produced on the engine mount.

5 A moving object has a property called momentum Momentum will have the direction of the velocity Momentum can be positive or negative Momentum = mass (kg) x velocity (m/s) p = m x v

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9 The momentum of an object doesnt change unless its mass, velocity or both change The total momentum of all objects in a collision will be the same before and after the collision Total momentum cant be lost or created. Law of conservation of momentum If a group of objects exerts forces only on each other, their total momentum shouldnt change.


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