sg5 - Chapter 5 Study Guide for Inertia 5.1 Rest and motion...

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Chapter 5 Study Guide for Inertia 5.1 Rest and motion Skill 5.1 Understand how friction aFects velocity Friction occurs when two surfaces are in contact with each other, and its e±ect is to bring the objects to rest with respect to one another. So friction changes the velocity of, say, an object sliding on a surface and thus causes an acceleration (it slows down the object). One can make experimental adjustments in order to reduce friction by ²oating an object on a cushion of air (the technique used in the lab) or lubricating the surface, but in reality two surfaces in contact are never truly frictionless. Note: For motion in the positive direction, the acceleration due to friction is negative. As a result, the surface with the least friction (and therefore the smallest magnitude of acceleration) has the least negative value for acceleration due to friction. So, the surface with the least friction has the largest acceleration due to friction (because it is the least negative; - 3 > - 5 and so on). 5.2 Collisions Skill 5.2 Understand how the inertia of two objects can be compared by colliding the objects and observing their motions When two objects collide, their velocities change; one object’s velocity increases and the other object’s velocity decreases. How much each object’s velocity changes depends on how massive the objects are. If the objects have the same mass, their velocities will interchange. The more massive an object is, the less its velocity changes. Example: If you collide two billiard balls, you would expect the motion of each to be equally a±ected by the collision. However, if you collide a billiard ball with a bowling ball, you expect the motion of the billiard ball to undergo a more drastic change than that of the more massive bowling ball. The measure of an object’s resistance to changes in velocity (accelerations), is called
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sg5 - Chapter 5 Study Guide for Inertia 5.1 Rest and motion...

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