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# Forobjectstocontinueincircular motionanetforce

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Unformatted text preview: hysical Science 1 Chapter 3 3rd Law of motion Action­Reaction Law: · For every action force, there an equal and opposite reaction force. · The force exerted by the bullet on the rifle is just as great as the force exerted by the rifle on the bullet. Why does the bullet accelerate more than the rifle? F = m a nd Based on Newton’s 2 Law, the bullet accelerates rapidly due to its small mass. F m = a Rifle Bullet 7 Physical Science 1 Chapter 3 CIRCULAR MOTION st · Based on Newton’s 1 Law, objects moving in circular motion, would fly off in a straight line if released. · For objects to continue in circular motion, a net force must be acting on them, based on Newton’s 2nd Law. This force is directed towards the center of the circle, and is thus called centripetal (center­seeking) force. · The centripetal force causes acceleration directed towards the center of the circle, thus called centripetal acceleration (ac). 8 Physical Science 1 Chapter 3 LAW OF UNIVERSAL GRAVITATION · Every body in the universe attracts every other body with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them. Gm1m 2 F= r 2 w here F=force of attraction betw een tw o bodies G=gravitation constant m1 =mass of one body m 2 =mass of second body r=distance betw een tw o bodies Examples: 1. By how much is the gravitational force between two bodies change when the distance between them is doubled? tripled? 2. Explain why you can feel the effect of gravity between you and the Earth, but not between you and your pencil. 9 Physical Science 1 Chapter 3 LINEAR MOMENTUM · Momentum is the inertia of moving objects. · Momentum is...
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