A quick quiz to ensure understanding of a simple pendulum.

1. A confidence booster quiz
1. A simple pendulumconsistsof apointmassattachedto a stringof negligible massthatdoesnotstretch.
a. True
b. False
2.
The arrows representforcesactingona pointmass(blue ball)
attachedto an inextensible stringthathaspartakenin angulardisplacement,itsequilibriumpositionisatthe red
circle where the angle is0. Describe eachforce actingon the blue ball duringthe givenplace intime.
3. The periodof a simple pendulumdependsonthe lengthof the pendulumandaccelerationdue togravityanda
drag constant.
a. True
b. False
4. For small angulardisplacementsthe accelerationof the massisproportional tothe displacementandoppositein
sign.
a. True
b. False

2. 1. True
2. The blackarrow representsthe tensionforce inthe stringcausedbythe weightof the ball.The greenarrow
representsthe vertical weightforce mgof the ball actingverticallydownward.The red arrow representsthe weight
force alongthe radial axis mgcosƟ whichisequal to the tensionforce blackarrow.The orange arrow representsthe
weightforce alongthe tangential axis mgsinƟ.Thisforce providesthe restoringforce thatpullsthe masstowards
the equilibriumposition.
3. False it dependsonlengthandgravitybutnoton a drag constant since itisa periodof a simple pendulumwhere
frictionisnegligible.
4. True