Projectile Motion | |
File Size: | 3922 kb |
File Type: | mp4 |
Was air resistance noticeable?
Air resistance is noticeable as shown by Figure 1.1. Since, air resistance is directly proportional to velocity squared, this means that the faster an object is traveling the more air resistance is acted upon an object. Air resistance is not noticeable but as shown by the graph, air resistance is there. Air resistance was affecting the motion of the ball. If air resistance was not noticeable the Velocity X-Component vs. Time Graph would be a straight horizontal line because there would be no other forces acting on it on the x-axis. The slope of any velocity graph is acceleration, this shows that acceleration on the X-Component is not constant because the slope of the line is not zero.
Was Energy conserved?
Energy is not conserved. If energy was conserved the total energy graph would be a horizontal line. The graph would be horizontal because no energy would get lost. But, as shown by the graph it is an downward sloping line, so energy is transferring into another form that is not Kinetic or Potential Energy. Work is force times distance. Force was changing and distance is constant, there was always work occurring on the ball.
Was momentum Conserved?
Momentum was not conserved. Momentum can also be described as impulse. Using Figure 1.3 we can determine that force for the X-Component is never zero.
Impulse = ΔP
Impulse = F (Final Time - Initial Time) Initial Time = 0.069 seconds Final Time = 0.93 seconds Fx cannot be calculated with information given but we can conclude that it is a positive number because as shown by Figure 1.3 the force is never zero .Fy is gravity. Fy = ma Fy = (26.21)(9.8) Fy = .256858 N ΔMomentum for X-Component (any positive number for Fx in N)(0.93-0.069 S) = Since this number is not 0 this results in a change of momentum which means that momentum was not conserved ΔMomentum for Y-Component (.256858 N)(0.9-0.069 S) (.256858 N)(.861 S) = 0.221154738 N * S This is also not equal to zero. Hence, momentum is not conserved. |
P - Momentum
m - Mass a - Acceleration Fx - Force for X-Component Fy - Force for Y-Component |