2. What we are going to achieve today Understand Newton’s second and third laws Understand how a rocket travels using an action reaction force. Be able to use the formula; Force = Mass x Acceleration. Create your own rocket that uses a reactionary force . Use Newton’s Laws to explain why three types of rocket travel at different speeds.
3. Big Questions! How does a rocket get off the ground? Why is a rocket shaped like a rocket?
4. Newton's 3 rd law…. Every force has an equal and opposite reaction that acts on a different body, so the force produced from the water coming out of the bottle, pushes the bottle in the opposite direction.
5. Newton’s third law A force cannot exist on its own – there is always a second force acting against it . These pairs of forces that act between two objects are sometimes called action–reaction pairs . If object A exerts a force on object B, then object B exerts an equal but opposite force on object A.
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7. What is Newton’s second law? If the resultant force acting on an object is not zero, all the forces are said to be unbalanced . the speed of the object may change – it may either increase or decrease the direction of motion may change.
8. Rail Road Toffee Rocket When are the forces balanced? Where are the forces unbalanced? How is the rocket car pushed forward?
12. Balloon Rockets The challenge is to make your rocket go the furthest ; the speed of the rocket is not relevant. What is the best way to control the thrust ? What is the best way to balance your rocket ?
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Notas do Editor
Teacher notes It might be worth pointing out to students that action-reaction pairs are not the same as balanced forces – while the latter act on just one object, the former act on two separate but interacting objects. Newton’s third law is sometimes written as: “ For every action, there is an equal and opposite reaction.”
