Si en la situación de la figura 2.1 la fuerza es de 1.5 N y el tiempo durante el cual actúa 1.0 s, ¿Qué impulso se comunica al cuerpo? Pág. 112 ¿Cuáles serían los resultados del ejemplo 2.9 si la masa de la canica incidente fuese: a) muchísimo menor que la de la canica en reposo, b) muchísimo mayor? Intenta argumentar tus respuestas primero cualitativamente y luego a partir de las ecuaciones obtenidas al resolver el ejemplo. Pág. 145

Part f - example: finding two forces (part i) two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. the block in (figure 1) has a mass m=10kg and is being pulled by a force f on a table with coefficient of static friction îľs=0.3. four forces act on it: the applied force f (directed î¸=30â above the horizontal). the force of gravity fg=mg (directly down, where g=9.8m/s2). the normal force n (directly up). the force of static friction fs (directly left, opposing any potential motion). if we want to find the size of the force necessary to just barely overcome static friction (in which case fs=îľsn), we use the condition that the sum of the forces in both directions must be 0. using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: fcosî¸â’îľsn=0 fsinî¸+nâ’mg=0 in order to find the magnitude of force f, we have to solve a system of two equations with both f and the normal force n unknown. use the methods we have learned to find an expression for f in terms of m, g, î¸, and îľs (no n).

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Which describes an object in projectile motion? check all that apply.a.gravity acts to pull the object downb.the object moves in a straight path.c.the forward velocity of the object is 0 m/s.d.the object’s inertia carries it forward.e.the path of the object is curved.