An ideal pendulum is often discussed when studying simple harmonic motion.

what are the conditions needed for an ideal pendulum? check all that apply.
a) gravitational force acts to pull the pendulum’s mass down.
b) the mass of the rod of the pendulum is evenly distributed along the rod.
c) the pivot on which the pendulum swings is frictionless.
d) the pendulum swings through its equilibrium position as a result of inertia.
e) tension acts downward on the pendulum’s mass.

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

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).

Drag each item into the proper state of matter category.