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Newton’s First and Second Laws
Chapter 12 Section 1
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Newton’s First Law When a force is applied, an object will have a change in the state of motion. Also known as inertia.
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Newton’s First Law Inertia is why you seem to slide when you make a sharp turn in a car.
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Newton’s Second Law Objects will speed up or slow down depending on unbalanced forces acting on them. Force equals mass multiplied by acceleration F = ma
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Practice #1 What net force is needed to accelerate a x 103 kg vehicle forward at 2.0 m/s2?
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Practice #2 A baseball accelerates downward at 9.8 m/s2. If the gravitational force is the only force acting on the baseball and is 1.4 N, what is the baseball’s mass?
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Practice #3 A sailboat ant its crew have a combined mass of 655 kg. If a net force of 895 N is pushing the sailboat forward, what is the sailboat’s acceleration?
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Practice #4 The net forward force on the propeller of a 3.2 kg model airplane is 7.0 N. What is the acceleration of the airplane.
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Practice #5 A group of people push a car from a resting position with a force of 1.99 × 103 N. The car and its driver have a mass of 831 kg. What is the acceleration of the car?
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Practice #6 If the space shuttle accelerates upward at 35 m/s2 , what force will a 59 kg astronaut experience?
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Practice #7 A soccer ball is kicked with a force of 15.2 N. The soccer ball has a mass of 2.45 kg. What is the ball’s acceleration?
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Practice #8 A person steps off a diving board and falls into a pool with an acceleration of 9.8 m/s2 , which causes the person to hit the water with a force of 637 N. What is the mass of the person?
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