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:
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
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
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.
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
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.