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# 13-4 - EQUATIONS OF MOTION RECTANGULAR COORDINATES Today's...

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EQUATIONS OF MOTION: RECTANGULAR COORDINATES Today’s Objectives: Students will be able to: 1. Apply Newton’s second law to determine forces and accelerations for particles in rectilinear motion. In-Class Activities: Check Homework Reading Quiz Applications Equations of Motion Using Rectangular (Cartesian) Coordinates Concept Quiz Group Problem Solving Attention Quiz

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READING QUIZ 1. In dynamics, the friction force acting on a moving object is always ________ A) in the direction of its motion. B) a kinetic friction. C) a static friction. D) zero. 2. If a particle is connected to a spring, the elastic spring force is expressed by F = ks . The “s” in this equation is the A) spring constant. B) un-deformed length of the spring. C) difference between deformed length and un- deformed length. D) deformed length of the spring.
APPLICATIONS If a man is trying to move a 100 lb crate, how large a force F must he exert to start moving the crate? What factors influence how large this force must be to start moving the crate? If the crate starts moving, is there acceleration present? What would you have to know before you could find these answers?

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APPLICATIONS (continued) If the dragster is traveling with a known velocity and the magnitude of the opposing drag force at any instant is given as a function of velocity, can we determine the time and distance required for dragster to come to a stop if its engine is shut off? How ? Objects that move in air (or other fluid) have a drag force acting on them. This drag force is a function of velocity.
RECTANGULAR COORDINATES (Section 13.4) The equation of motion, F = m a , is best used when the problem requires finding forces (especially forces perpendicular to the path), accelerations, velocities, or mass.

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13-4 - EQUATIONS OF MOTION RECTANGULAR COORDINATES Today's...

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