Chapter 4: Newton’s Laws of Motion - Iowa State University



Chapter 4: Newton’s Laws of MotionEach of the following expressions describes one of Newton’s Laws of Motion; label each expression with which one of Newton’s Laws it describes and give a written definition of each expression.F=ma If F=0 then a = 0 & v = constantFAB= - FAB“It’s not the fall that hurts you; it’s the sudden stop at the bottom.” Translate this saying into the language of Newton’s Laws In a head on auto-collision, passengers not wearing seatbelts can be thrown through the windshield. Use Newton’s Laws of Motion to explain why this happens.Which feels a greater pull due to Earth’s gravity, a 10-kg stone or a 20-kg stone? If you drop them, why does the 20-kg stone not fall with twice the acceleration of the 10-kg stone? Explain your reasoning.At the surface of Jupiter’s moon Io, the acceleration due to gravity is g=1.81 m/s^2. A watermelon weighs 44.0 N at the surface of the earch.What is the watermelon’s mass on the earth’s surface?What are its mass and weight on the surface of Io?Chapter 4: Newton’s Laws of MotionLonger Problem:To study damage to aircraft that collide with large birds, you design a test gun that will accelerate chicken-sized objects so that their displacement along the gun barrel is given by x = (9.0 x 103 m/s2) t2 – (8.0 x 104 m/s3)t3. The object leaves the end of the barrel at t = 0.025 seconds. How long must the gun barrel be?What will be the speed of the objects as they leave the end of the barrel?What net force must be exerted on a 1.50 kg object at (i.) t = 0 seconds and (ii.) t = 0.025 seconds? ................
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