Projectile Motion

1. Projectile Motion Falling things, and rockets ‘n’ that…

2. Projectile Motion This involves any objects under the influence of gravity. • Objects which are dropped (not travelling horizontally) and • Objects which are launched (with a horizontal component).

3. Objects Under the Influence of Gravity: Everything close to the Earth’s surface is accelerating towards the Earth at a rate of due to gravity. This means in problems involving falling we can always use a=in kinematic equations. For every kg of mass an object experiences a weight force of 9.81 Newtons (N) Given by: W=mg Where W is weight

4. Rutterp. 32,33 – odd questions Continued… What does this mean for objects dropped from the same height? Objects dropped from the same height will hit the ground at the same time, regardless of weight (ignoring differences in air resistance) http://www.animations.physics.unsw.edu.au/jw/projectiles.htm#1 Solve the same way you would any other kinematics problem… State what you know, what do you want to find? Choose an equation and solve for your unknown. Look out for key words like.. “dropped”, “from rest” and “stationary:”

5. What will hit the ground first a bullet dropped or a bullet fired from the same height?Discuss with your neighbour…http://www.youtube.com/watch?v=D9wQVIEdKh8

6. Projectile Motion Projectile motion follows a parabolic path i.e. http://phet.colorado.edu/sims/projectile-motion/projectile-motion_en.html It has a horizontal (x) component and a vertical (y) component. The horizontal component is not affected by gravity, so use separate equationsfor the different components. http://www.tutorvista.com/content/physics/physics-iii/kinematics/projectile-motion-animation.php