1 Projectile: the study of the movement of an object that is in the air When an object is projected into the air (and thus becomes a projectile)two things act to change its motion 1. Gravity and 2. Air resistance 2 3 The harder the ball is hit (force applied), the further and faster the ball will go. Where you hit the ball (point of applied force), will affect the direction How the ball is struck (centre/to/bottom) (direction of applied force) 4 What is gravity? The force caused by the pull of the earth’s mass 5 Drag force resists the movement of a projectile 6 What is trajectory? The flight path of an object such as a ball 7 The range is the horizontal distance the object travels Horizontal distance depends on horizontal velocity and the time the object spends traveling at that velocity (the time of flight) 8 Angle of release is the angle at which the object is projected into the air 9 At what point in the course of a jump does a water-ski jumper become a projectile? 2. At what point does a pole vaulter become a projectile during the course of a successful vault? 3. Is it possible for the vaulter to become a projectile more than once after leaving the ground and still have a successful vault? If so, how? 1. 10 The moment the ski’s leaves the surface of the water and goes into the air 2. The moment the jumper’s body leaves the running surface and the jumper’s weight is placed on the vault 3. If running is determined as a projectile – yes If only the jump is determined as a projectile - no 1. 11 12