PHYSICS 7A Chapter Notes - Chapter 5: Circular Motion, Friction, Terminal Velocity
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Static friction acts in a direction parallel to the two surfaces that are touching, even when they are not moving past one another. Once the maximum force of static friction is exceeded, kinetic friction. Kinetic friction acts opposite to the direction of velocity, and is approximately proportional to the. Giancoli: chapter 5 normal force between the two surfaces according a constant as shown in the following formula: (cid:1421) takes over and the objects begin moving. (cid:1421)(cid:1422) Moving in a circle at a constant speed(cid:1317) entails uniform circular motion for an object. Remember: in problems with a slope/inclined plane, the normal force is always perpendicular to the slope/plane. Gravity is always vertically downward toward the center of the earth. 5. 2 uniform circular motion - kinematics movement, velocity"s magnitude remains constant, but its direction changes every instant. This constantly changing direction of velocity equates to a constantly changing acceleration, which is de ned as follows:
