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Transcript
8.P.2A.3 September 09, 2016 8.P.2A.3 Newton's First Law: Inertia Construct explanations for the relationship between the mass of an object and the concept of inertia (Newton's First Law of Motion) The velocity of an object will remain constant unless a net force acts on it. Inertia The tendency for objects to stay in motion if they are in motion Tendency for objects to stay at rest if they are at rest The more mass an object has, the harder it is to stop it The more mass an object has, the harder it is to get it to move If an object has a large amount of inertia (due to large mass) – It will be hard to slow down or speed it up if it moving. – It will be hard to make it start moving if it is at rest. – It will be hard to make it change directions. In other words, the more mass an object has, the more inertia it has Examples of Inertia • It causes a passenger in a car to continue to move forward even when the car has stopped • The reason it is harder to push a wheelbarrow full of bricks rather than an empty one • Inertia is the reason it is harder to stop a big truck going 55 mph than a small car going 55 mph Which type of car, a heavier one or a lighter one, needs more force to slow down with the same deceleration? The heavier car needs to have more braking force to have the same deceleration because of its mass. 8.P.2A.3 LAB (Around and Around) 1. Suspend the ball in front of you and swing it in a horizontal circle, keeping it 2-3cm above the floor. 2. Let go of the thread and observe the direction in which the ball rolls. 3. Repeat this several time, letting go of the thread at different points. 4. At what point do you need to let go of the thread if you want the ball to roll directly away from you? Toward you? 5. Draw a diagram as part of your answer. September 09, 2016 Remember as you are going through the lab, that inertia is not a force but a way to describe motion 8.P.2A.3 September 09, 2016