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velocity = speed + direction of motion Things that have both a magnitude and a direction are called vectors. More on vectors in Ch.3. For 1D motion (motion along a straight line, like on an air track), we can represent the direction of motion with a +/– sign. + = going right .
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Since the object is accelerating, there must be a force to keep it moving in a circle. 2 mv. F. 2. c = = mω r. r. This centripetal force may be provided by friction, tension in a string, gravity etc. or combinations. Examples? §6.2 9. Note that centripetal force is the name given to the resultant force: it is not a separate force in the free ...
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Four common ways to express the speed of a uniform circular motion. (1) speed, v, (2) period, τ , (3) angular speed, ω and (4) number of revolutions per unit time. We can relate v and τ by the following reasoning: Distance traveled in one revolution = 2πr. Hence, vτ = 2πr.
• Understand the definition of force. 4.2.Newton’s First Law of Motion: Inertia • Define mass and inertia. • Understand Newton's first law of motion. 4.3.Newton’s Second Law of Motion: Concept of a System • Define net force, external force, and system. • Understand Newton’s second law of motion.
coefficient or rolling friction μ. , defined as the ratio of the force needed for constant speed to the normal force exerted by the surface over which the rolling motion takes place, is significantly lower than the coefficient of kinetic friction μ. Typical values for μ range from 10−3 to 10−2.
• Kinematics – branch of physics; study of motion • Position (x) – where you are located • Distance (d) – how far you have traveled, regardless of direction • Displacement (Dx) – where you are in relation to where you started Distance vs. Displacement • You drive the path, and your odometer goes up by 8 miles (your distance).
Newton's Laws: Forces and Motion A force is a push or a pull. A force is a vector : it has a magnitude and a direction. Forces add like vectors, not like scalars. Example: Two forces, labeled F 1 and F 2, are both acting on the same object. The forces have the same magnitude F F F 12 oand are 90 apart in direction: F F F F F
