QUESTION 8 10 points Saved Let\'s examine over the next few questions an NFL kic

Question

QUESTION 8 10 points Saved Let's examine over the next few questions an NFL kick as described in the 3rd Law video. The announcer claimed that the ball is struck with "almost a ton of force. First of al, phrases like "almost a ton" drive physics people crazy. Give me a numberl So let's guess-timate 1900 lbs of force. Convert that to Newtons 8451.6 QUESTION 9 10 points Save Answer The kicking video did give a solid number that the duration of the kick was 0.008 seconds. Using the Newtons above the seconds given here, calculate the 'Impulse" on the football. QUESTION 10 10 points Save Answer The mass of an NFL football is.43 kg. The launch speed of an NFL kick is about 40 m/s. Use the Impulse you got in the above answer to calculate the speed of the football. It for the huge kinetic energy in the leg of the NFL kicker moving through the ball!

Explanation / Answer

8) 1 lbs=4.448 N

there fore 1900lbs =1900*4.448 = 8451.2 N

9) Impulse = force * time = 8451.2 * 0.008 = 67.61 kgm/s

10) If complete impulse is converted into mometum of ball, speed of ball should be 67.61/.43 = 157.24 m/s

Deformation of football, energy loss due to deformation is not considered.

Leg of NFL kicker is not at rest immediately after rest which receives some momentum back.

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