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Rocket Energy Thrust Force Maximum Height Launching the Rockets A force called thrust is needed to launch the rocket. Thrust Force A relationship exists between the rocket mass and the force needed to move it (thrust). Force = mass X acceleration F = ma Or a = F/m and m = F/a Example… Using the equation a = F/m Note: Force is in Newtons mass must be in Kg If thrust is 9.5N and your rocket has a mass of 30 g (30 g = 0.03Kg) then, a = 9.5N/0.03kg a = 316.7 m/s2 Great! Our rocket will launch. Will the Rocket Fly? If the acceleration, a, is less than gravity (9.8m/s2), the rocket will not launch. Think About… What effects will the mass of the rocket have on the height reached by the rocket? What could we do to make our rocket launch? Solutions: use a larger engine or a lighter (mass) rocket. Maximum Rocket Height There is a relationship between the maximum height of the rocket and the distance between you and the rocket. Height = distance X “ratio” H = d(tanθ) What is tanθ ? This is a simple ratio you calculate with your scientific calculator when you know the angle of elevation. Measuring the angle We will use the altimeter to measure the angle of elevation of our rockets. Example Remember… Why should the height of the person holding the tracker be added to the measurement of the rocket's altitude?