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Additional Newton’s Second Law of Motion Problems and Friction Problems 1. A 1250-kg car accelerates from 10 m/s to 30 m/s in 5 seconds. What is the net force on the car? = aav ∆v∆t = F ma = - 30 ms 10 ms5 s = 1250 kg4 ms2 = 4 ms2 = 5000 nt 2. A 12,000-kg airplane launched by a catapult from an aircraft carrier is accelerated from 0 to 200 km/hr in 3.0 seconds. a. What is the acceleration of the airplane? × × = . 200 km1 hr 1000 m1 km 1 hr3600 s 55 6ms = aav ∆v∆t = . - . 55 6 ms 0 ms3 0 s = . 18 5 ms2 b. What is the average force in newtons that the catapult exerts on the airplane? Covert this force to pounds. = F ma , × . = , 222 000 nt 1 lb4 4 N 50 500 lb = , . 12 000 kg18 5 ms2 = , 222 000 nt 3. A 600-gram ball lying on the ground is kicked with a force of 250 newtons. If the kick lasts 0.02 seconds, what is the speed that the ball flies off with? × = . 600 g 1 kg1000 g 0 600 kg = F ma = aav ∆v∆t = . 250 nt 0 600 kga = . 417 ms2 ∆v0 02 s = a 417ms2 = . ∆v 8 33 ms

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