Caroline Chisholm College Physics

1. 2. Many factors have to be taken into account toachieve a successful rocket launch,maintain a stable orbitand return to Earth Caroline Chisholm College Physics

2. Galileo's analysis of projectile motion Describe Galileo’s analysis of projectile motion Caroline Chisholm College Physics internet

3. Caroline Chisholm College Physics Describe the trajectory of an object undergoing projectile motion within the Earth’s gravitational field in terms of horizontal and vertical components

4. Describe Galileo’s analysis of projectile motion. Caroline Chisholm College Physics

5. solve problems and analyse information to calculate the actual velocity of a projectile from its horizontal and vertical components using: v = u + at v2 = u2+ 2as s = ut + ½ at2 (N.B. change to component versions) Caroline Chisholm College Physics APPLET vx= ux+ axtvx2 = ux2+ 2axDxDx = uxt + ½ axt2 vx= uxvx2 = ux2Dx = uxt vy= uy+ aytvy2 = uy2+ 2ayDyDy = uyt + ½ ayt2

6. Describe the trajectory of an object undergoing projectile motion within the Earth’s gravitational field in terms of horizontal and vertical components Caroline Chisholm College Physics The trajectory of a projectile in the Earth’s gravitational field is parabolic, provided that air resistance is ignored and the acceleration due to gravity is uniform. This complex motion can be analysed by considering its horizontal and vertical components at particular instances during the flight. The horizontal motion of the projectile is a constant velocity (air resistance is assumed negligible). Its vertical motion is changing all the time due to the effect of gravity, which causes the projectile to accelerate at 9.8 m s-2 downwards. (NSW HSC on-line)

7. 15 m 5 m/s Caroline Chisholm College Physics

8. 15 m 5 m/s Caroline Chisholm College Physics

9. Caroline Chisholm College Physics

10. Perform a first-hand investigation,gather information andanalyse data to calculate initial and final velocity,maximum height reached, range,and time of flight of a projectile, for a range of situations by usingsimulations, data loggers andcomputer analysis Caroline Chisholm College Physics Projectile motion simulation Cannon Projectile motion Experiments Stroboscopic photography Video analysis Marble launcher Data logger for launch velocity

11. Describe first-hand investigationsyou conducted to investigate initial and final velocity,maximum height reached, range, and time of flight of a projectile, for a range of situations by usingsimulations, data loggers and computer analysis Caroline Chisholm College Physics

12. Caroline Chisholm College Physics

13. Explain the concept of escapevelocity in terms of the:– gravitational constant– mass and radiusof the planetOutline Newton‘s concept ofescape velocity (see website) Caroline Chisholm College Physics

14. Escape velocity is the velocity required to just escape the gravitational pull of the planet. It depends on the ratio of the mass and radius of the planet. The formula shows that the larger the mass/radius ratio of the planet, the greater the escape velocity is. i.e. if 2 planets had the same radius, the planet with the larger mass would have a greater escape velocity. Explain the concept of escape velocity in terms of the:– gravitational constant– mass and radiusof the planet Outline Newton‘s concept ofescape velocity Caroline Chisholm College Physics Outline Newton‘s concept ofescape velocity (Jacaranda p.27)

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