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Gravity vs Drag Force:
Fgravity = Fdrag -m g sin θ = (0.5) CD A ρ V2
Acceleration of Gravity: g = -9.80 m/s2 Angle of slope: θ = 45° Drag coefficient: CD = 0.34 Frontal area: A = 0.714 m2 Air density: ρ = 0.91 kg/m3 158.4 mph |
(4 + 6) x 10 = 100
4 + (6 x 10) = 64
Strain Energy = 1/2 kΔx2
1/2 (15,000) (0.0112) = 90.75
Now, let's add units
1/2 (15,000N / m) (0.011 m)2 = 90.75 N/m(m2) = 90.75 Nm = 90.75 J
Terminal velocity: The ultimate speed that can be attained when falling under the influence of gravity (skydiving)
What is your weight?
1 lb = 4.45 N
150 lb (4.45 N/1 lb) = 688 N
Coach Eyestone's marathon goal (sub 2:11:00)
Convert to m/s and min/mi
Marathon = 26 mi 385 yd
Addition of Forces
What happens when there is more than one force?
A shot put is released with a velocity of 14 m/s at an angle of 42 degrees. What are the vertical and horizontal components of velocity? (Article example)
A baseball is thrown with a horizontal velocity of 47.0 m/s and a vertical velocity of 4.1 m/s. What is the resultant velocity (magnitude and direction)?
